ORCID Profile
0000-0002-1190-1301
Current Organisation
Flinders University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Hydrogeology | Physical Geography and Environmental Geoscience | Environmental Management | Surfacewater Hydrology | Water Resources Engineering | Physical oceanography | Photogrammetry and remote sensing | Geomorphology and earth surface processes | Aboriginal and Torres Strait Islander Environmental Knowledge | Physical geography and environmental geoscience |
ANZSRC Socio-Economic Objective (SEO)
Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and Industrial Use) | Physical and Chemical Conditions of Water in Coastal and Estuarine Environments | Expanding Knowledge in the Environmental Sciences | Land and Water Management of environments not elsewhere classified | Sparseland, Permanent Grassland and Arid Zone Land and Water Management | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments | Coastal and Estuarine Water Management | Farmland, Arable Cropland and Permanent Cropland Flora, Fauna and Biodiversity | Fresh, Ground and Surface Water Flora, Fauna and Biodiversity
Related Links
Publications
Root-induced changes of soil hydraulic properties – A review
Publisher: Elsevier BV
Date: 10-2020
Problems with the application of hydrogeological science to regulation of Australian mining projects
Publisher: Elsevier BV
Date: 05-2017
Sea‐level rise impact on fresh groundwater lenses in two‐layer small islands
Publisher: Wiley
Date: 05-11-2013
DOI: 10.1002/HYP.10059
Assessment of the impact of sea-level rise on seawater intrusion in sloping confined coastal aquifers
Publisher: Elsevier BV
Date: 07-2020
Adaptive management in groundwater planning and development: A review of theory and applications
Publisher: Elsevier BV
Date: 07-2020
Threats to coastal aquifers
Publisher: Springer Science and Business Media LLC
Date: 25-06-2013
DOI: 10.1038/NCLIMATE1901
Is Decoupling GDP Growth from Environmental Impact Possible?
Publisher: Public Library of Science (PLoS)
Date: 14-10-2016
Influence of the first-order exchange coefficient on simulation of coupled surface–subsurface flow
Publisher: Elsevier BV
Date: 2012
Catchment-scale groundwater-flow and recharge paradox revealed from base flow analysis during the Australian Millennium Drought (Mt Lofty Ranges, South Australia)
Publisher: Springer Science and Business Media LLC
Date: 30-01-2021
The influence of river-to-lake backflow on the hydrodynamics of a large floodplain lake system (Poyang Lake, China)
Publisher: Wiley
Date: 22-09-2017
DOI: 10.1002/HYP.10979
A conceptual study of offshore fresh groundwater behaviour in the Perth Basin (Australia): Modern salinity trends in a prehistoric context
Publisher: Elsevier BV
Date: 10-2018
How important is the impact of land-surface inundation on seawater intrusion caused by sea-level rise?
Publisher: Springer Science and Business Media LLC
Date: 04-08-2013
Fault-controlled springs
Publisher: Elsevier BV
Date: 07-2022
On the Panday and Huyakorn surface-subsurface hydrology test case: Analysis of internal flow dynamics
Publisher: Wiley
Date: 24-01-2011
DOI: 10.1002/HYP.7959
Using geochemistry to discern the patterns and timescales of groundwater recharge and mixing on floodplains in semi-arid regions
Publisher: Elsevier BV
Date: 03-2019
A national inventory of seawater intrusion vulnerability for Australia
Publisher: Elsevier BV
Date: 09-2015
Numerical modelling of saltwater up-coning: Comparison with experimental laboratory observations
Publisher: Elsevier BV
Date: 05-2011
Effects of Unsaturated Flow on Salt Distributions in Tidally Influenced Coastal Unconfined Aquifers
Publisher: American Geophysical Union (AGU)
Date: 06-2023
DOI: 10.1029/2022WR032931
Abstract: Unsaturated flow influences both the seawater extent under steady‐state conditions and the propagation of tides in coastal aquifers. However, its effects on salt distributions in tidally influenced coastal aquifers are little investigated. The present study used numerical simulations and data from laboratory experiments to analyze the effects of unsaturated flow on density‐dependent solute transport in coastal unconfined aquifers. The effects of the inland boundary condition (i.e., constant‐head or constant‐flux) were tested. Compared to a stable sea level, the results show that unsaturated flow has a more pronounced influence on salt distributions in coastal unconfined aquifers when tides are considered, regardless of the type of inland boundary condition. Neglect of unsaturated flow effects leads to expansion of the upper saline plume (USP), shrinkage of the saltwater wedge (seaward movement of saltwater wedge), and overestimation of water and salt exchange across the aquifer‐ocean interface. This is caused by a lower head in the nearshore area during high‐tide periods with the unsaturated zone effects removed. Thus, without the unsaturated zone, stronger head gradients within the nearshore aquifer occur at high tide, leading to stronger tidally driven seawater infiltration and hence a larger USP. Counterintuitively, ignoring unsaturated flow effects leads to greater average inland head over a tidal period, which shifts the saltwater wedge seaward. It is concluded that unsaturated zone effects should not be neglected for modeling tide‐affected seawater intrusion, especially if quantification of near‐shore conditions is important.
Groundwater recharge to a sedimentary aquifer in the topographically closed Uley South Basin, South Australia
Publisher: Springer Science and Business Media LLC
Date: 03-11-2011
On concentrated solute sources in faulted aquifers
Publisher: Elsevier BV
Date: 06-2017
Influence de la conception du modèle sur la quantification de la recharge unidimensionnelle
Publisher: Springer Science and Business Media LLC
Date: 18-01-2014
Tracer adsorption in sand-tank experiments of saltwater up-coning
Publisher: Elsevier BV
Date: 2012
Impacts of Heterogeneity on Aquifer Storage and Recovery in Saline Aquifers
Publisher: American Geophysical Union (AGU)
Date: 05-2022
DOI: 10.1029/2021WR031306
Abstract: Aquifer storage and recovery (ASR) involves the injection, and later extraction, of freshwater into aquifers, which often contain saline groundwater. Mixing between the fresh injectant and native saltwater often leads to part of the injectant becoming unrecoverable, thereby impacting ASR performance. This study explores freshwater‐saltwater mixing within ASR operations arising from aquifer heterogeneity using Monte Carlo analysis of 2D‐axisymmetric, density‐dependent flow and transport models. Logarithmic hydraulic conductivity (ln K ) distributions are generated using either two‐point statistics or higher‐order connectivity features. Results show that higher variance in ln K leads to stronger freshwater‐saltwater mixing, which lowers the recovery efficiency (RE i.e., ratio of extracted to injected freshwater). On average, the lowest RE values were obtained from ln K fields with connected high‐ K features, across all ASR cycles. In contrast, RE values from ln K fields with connected low‐ K features were typically the highest, at least where buoyancy was considered. The impact of aquifer heterogeneity on RE reduces with subsequent ASR cycles. Buoyancy was a major factor in lowering RE regardless of the adopted heterogeneity model. Heterogeneity tended to mitigate the adverse impacts of buoyancy, leading to some heterogeneous cases having higher RE values than the corresponding homogeneous case. These results highlight the importance of understanding buoyancy effects and subsurface heterogeneity (including the connectivity of geological structures), and interrelationships thereof when assessing the feasibility of multi‐cycle ASR in heterogeneous saline aquifers.
Effects of River Partial Penetration on the Occurrence of Riparian Freshwater Lenses: Theoretical Development
Publisher: American Geophysical Union (AGU)
Date: 30-09-2020
DOI: 10.1029/2020WR027786
Abstract: Previous studies of freshwater lenses in saline aquifers adjoining gaining rivers (“riparian lenses”) have so far considered only rivers that fully penetrate the aquifer, whereas in most cases, rivers are only partially penetrating. This paper presents a new methodology for obtaining the saltwater discharge and the shape of a steady‐state, non‐dispersive riparian lens, where the river is partially penetrating, combining two previous analytical solutions. The resulting analytical solution is compared to numerical modeling results to assess assumptions and the methodology adopted to approximate the “turning effect”, which is the change in groundwater flow direction (horizontal to vertical) near the partially penetrating river. Model parameters were taken from previous studies, representing simplified conditions in the River Murray floodplains (Australia). Consistency between analytical and numerical results and field observations highlights the capability of the proposed analytical solution to predict the riparian lens geometry and saltwater discharge into partially penetrating rivers. Sensitivity analysis indicates that larger riparian lenses are produced adjacent to the deeper and wider rivers, as expected. The change in width or depth of the river has more influence on the saltwater discharge and the horizontal extent of the riparian lens (and less effect on the vertical extent of the lens adjacent to the river) for shallower and narrower rivers. This research highlights the utility of the new method and demonstrates that the assumption of a fully penetrating river likely leads to significant overestimation of the saltwater discharge to the river and the riparian lens horizontal extent and vertical depth.
Evaluation of analytic solutions for steady interface flow where the aquifer extends below the sea
Publisher: Elsevier BV
Date: 08-2017
Influence of Boundary Condition Types on Unstable Density‐Dependent Flow
Publisher: Wiley
Date: 09-05-2013
DOI: 10.1111/GWAT.12067
Abstract: Boundary conditions are required to close the mathematical formulation of unstable density-dependent flow systems. Proper implementation of boundary conditions, for both flow and transport equations, in numerical simulation are critical. In this paper, numerical simulations using the FEFLOW model are employed to study the influence of the different boundary conditions for unstable density-dependent flow systems. A similar set up to the Elder problem is studied. It is well known that the numerical simulation results of the standard Elder problem are strongly dependent on spatial discretization. This work shows that for the cases where a solute mass flux boundary condition is employed instead of a specified concentration boundary condition at the solute source, the numerical simulation results do not vary between different convective solution modes (i.e., plume configurations) due to the spatial discretization. Also, the influence of various boundary condition types for nonsource boundaries was studied. It is shown that in addition to other factors such as spatial and temporal discretization, the forms of the solute transport equation such as ergent and convective forms as well as the type of boundary condition employed in the nonsource boundary conditions influence the convective solution mode in coarser meshes. On basis of the numerical experiments performed here, higher sensitivities regarding the numerical solution stability are observed for the Adams-Bashford/Backward Trapezoidal time integration approach in comparison to the Euler-Backward/Euler-Forward time marching approach. The results of this study emphasize the significant consequences of boundary condition choice in the numerical modeling of unstable density-dependent flow.
Correction factor to account for dispersion in sharp-interface models of terrestrial freshwater lenses and active seawater intrusion
Publisher: Elsevier BV
Date: 04-2017
Prediction and uncertainty of free convection phenomena in porous media
Publisher: American Geophysical Union (AGU)
Date: 02-2012
DOI: 10.1029/2011WR011346
Upstream Dispersion in Solute Transport Models: A Simple Evaluation and Reduction Methodology
Publisher: Wiley
Date: 20-08-2021
DOI: 10.1111/GWAT.13036
Effects of River Partial Penetration on the Occurrence of Riparian Freshwater Lenses: Experimental Investigation
Publisher: Wiley
Date: 16-02-2021
Solute transport in permeable porous media containing a preferential flow feature
Publisher: Elsevier BV
Date: 2022
The onshore influence of offshore fresh groundwater
Publisher: Elsevier BV
Date: 06-2018
Approximate analytical solutions for assessing the effects of unsaturated flow on seawater extent in thin unconfined coastal aquifers
Publisher: Elsevier BV
Date: 02-2022
Current Practice and Future Challenges in Coastal Aquifer Management: Flux-Based and Trigger-Level Approaches with Application to an Australian Case Study
Publisher: Springer Science and Business Media LLC
Date: 17-02-2011
Fractured bedrock and saprolite hydrogeologic controls on groundwater/surface-water interaction: a conceptual model (Australia)
Publisher: Springer Science and Business Media LLC
Date: 21-06-2009
Impact of fracture network geometry on free convective flow patterns
Publisher: Elsevier BV
Date: 09-2014
Application of Indicator Kriging to hydraulic head data to test alternative conceptual models for spring source aquifers
Publisher: Elsevier BV
Date: 10-2021
Investigating a complex lake-catchment-river system using artificial neural networks: Poyang Lake (China)
Publisher: IWA Publishing
Date: 19-01-2015
DOI: 10.2166/NH.2015.150
Abstract: Lake hydrological simulations using physically based models are cumbersome due to extensive data and computational requirements. Despite an abundance of previous modeling investigations, real-time simulation tools for large lake systems subjected to multiple stressors are lacking. The back-propagation neural network (BPNN) is applied as a first attempt to simulate the water-level variations of a large lake, exemplified by the Poyang Lake (China) case study. The BPNN investigation extends previous modeling efforts by considering the Yangtze River effect and evaluating the influence of the Yangtze River on the lake water levels. Results indicate that the effects of both the lake catchment and the Yangtze River are required to produce reasonable BPNN calibration statistics. Modeling results suggest that the Yangtze River plays a significant role in modifying the lake water-level changes. Comparison of BPNN models to a 2D hydrodynamic model (MIKE 21) shows that comparable accuracies can be obtained from both modeling approaches. This implies that the BPNN approach is well suited to long-term predictions of the water-level responses of Poyang Lake. The findings of this work demonstrate that BPNN can be used as a valuable and computationally efficient tool for future water resource planning and management of the Poyang Lake.
Characteristics and causal factors of hysteresis in the hydrodynamics of a large floodplain system: Poyang Lake (China)
Publisher: Elsevier BV
Date: 10-2017
On the resilience of small-island freshwater lenses
Publisher: Elsevier BV
Date: 09-2018
On the representation of subsea aquitards in models of offshore fresh groundwater
Publisher: Elsevier BV
Date: 02-2018
Effect of transient solute loading on free convection in porous media
Publisher: American Geophysical Union (AGU)
Date: 11-2010
DOI: 10.1029/2010WR009314
Science sidelined in approval of Australia’s largest coal mine
Publisher: Springer Science and Business Media LLC
Date: 11-05-2020
GRACE-Based Hydrological Drought Evaluation of the Yangtze River Basin, China
Publisher: American Meteorological Society
Date: 12-02-2016
Abstract: In this study, hydrological drought in the Yangtze River basin (YRB) is characterized based on Gravity Recovery and Climate Experiment (GRACE) total water storage (TWS). An artificial neural network approach is applied to extend the GRACE TWS observations (2003–12) to a longer TWS time series (1979–2012), which is well matched (Nash–Sutcliff efficiency of 0.83) to the GRACE data. Hydrological drought is identified by water storage deficit (WSD the shortfall in TWS from the average value) in three consecutive months. The method builds on previous research by considering potentially ineffective interdrought events and by characterizing drought recovery time from a multidecadal TWS time series. The results show that the YRB was in hydrological drought 29 times during 1979–2012, and the three subbasins of the YRB (upper, middle, and lower YRB) experienced between 21 and 28 hydrological drought events during the same period. The drought recovery time, defined as the time required for WSD to recover to average conditions, is evaluated by a simple statistical approach based on the empirical cumulative distribution function. The average drought recovery time is 3.3 months for the entire YRB and ranges from 2.3 to 3.4 months for the three subbasins. The severest YRB drought occurred during 2003–08 as a result of below-average precipitation, high temperatures, and intense human activities. The results demonstrate that GRACE data are useful for reconstructing the TWS time series for a large river basin, from which hydrological drought can be characterized, and for investigating spatial and temporal trends in water storage conditions.
Float-laser device for measuring the water table and freshwater–saltwater interface in laboratory-scale experimental systems
Publisher: Springer Science and Business Media LLC
Date: 07-11-2021
Boundary Condition Nomenclature Confusion in Groundwater Flow Modeling.
Publisher: Wiley
Date: 18-06-2019
DOI: 10.1111/GWAT.12893
Characterisation of intertidal springs in a faulted multi-aquifer setting
Publisher: Elsevier BV
Date: 2023
Application of an Analytical Solution as a Screening Tool for Sea Water Intrusion
Publisher: Wiley
Date: 24-03-2016
DOI: 10.1111/GWAT.12411
Abstract: Sea water intrusion into aquifers is problematic in many coastal areas. The physics and chemistry of this issue are complex, and sea water intrusion remains challenging to quantify. Simple assessment tools like analytical models offer advantages of rapid application, but their applicability to field situations is unclear. This study examines the reliability of a popular sharp-interface analytical approach for estimating the extent of sea water in a homogeneous coastal aquifer subjected to pumping and regional flow effects and under steady-state conditions. The analytical model is tested against observations from Canada, the United States, and Australia to assess its utility as an initial approximation of sea water extent for the purposes of rapid groundwater management decision making. The occurrence of sea water intrusion resulting in increased salinity at pumping wells was correctly predicted in approximately 60% of cases. Application of a correction to account for dispersion did not markedly improve the results. Failure of the analytical model to provide correct predictions can be attributed to mismatches between its simplifying assumptions and more complex field settings. The best results occurred where the toe of the salt water wedge is expected to be the closest to the coast under predevelopment conditions. Predictions were the poorest for aquifers where the salt water wedge was expected to extend further inland under predevelopment conditions and was therefore more dispersive prior to pumping. Sharp-interface solutions remain useful tools to screen for the vulnerability of coastal aquifers to sea water intrusion, although the significant sources of uncertainty identified in this study require careful consideration to avoid misinterpreting sharp-interface results.
Salinograph trends as indicators of the recession characteristics of stream components
Publisher: Wiley
Date: 30-07-2008
DOI: 10.1002/HYP.6883
Dispersion effects on the freshwater–seawater interface in subsea aquifers
Publisher: Elsevier BV
Date: 08-2019
On the testing of fully integrated surface–subsurface hydrological models
Publisher: Wiley
Date: 21-11-2012
DOI: 10.1002/HYP.9630
A modelling investigation of solute transport in permeable porous media containing a discrete preferential flow feature
Publisher: Elsevier BV
Date: 08-2016
Dynamic groundwater and salt transport near a tidal, partially penetrating estuary
Publisher: Elsevier
Date: 2004
Sediment mobilisation and release through groundwater discharge to the land surface: Review and theoretical development
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.SCITOTENV.2020.136757
Abstract: The discharge of groundwater to the land surface and to lakes and streams may express subsurface particles. This may lead to preferential pathways and increased fluxes of groundwater, sediment and contaminants, and modified subsurface structures. The current review attempts to describe and categorise the various forms through which sediment may be liberated in areas of groundwater discharge. Forces acting on subsurface particles in areas of groundwater discharge include seepage (drag), buoyancy and particle weight, amongst other, more complex forces. Equations for these can be combined to create formulae for approximating the conditions under which groundwater discharge will transport particles to the surface. Two forms of subsurface sediment transport are considered: (1) flow through an immobile granular matrix (suffusion and suffosion), and (2) flow through preferential pathways (i.e., often treated as pipes). Suffusion involves sediment movement that does not impact the soil's stability, whereas suffosion creates changes to soil stability and, consequently, soil volume. Preferential flow may arise from cracks in cohesive materials or through localised fluidization of non-cohesive soils, leading in some situations to sand boils. Guidance is presented on the minimum theoretical hydraulic gradient required for grains of various sizes to start to rise. New simple formulae are developed that build on existing theory, and these are compared to previous laboratory data, showing that suffusion is more or less predictable using the new simple method. However, experimental sand boils require larger hydraulic gradients compared to theory. The current analysis summarises the state of knowledge and persistent knowledge gaps associated with sediment ejection through groundwater discharge, which we expect has wide-ranging applications in terms of sediment transport in coastal regions and to surface water bodies, and where strong groundwater discharge is known to occur.
Modelling size constraints on carbonate platform formation in groundwater upwelling zones
Publisher: Springer Science and Business Media LLC
Date: 29-11-2018
DOI: 10.1038/S41598-018-35771-Z
Abstract: Carbonate depositional systems related to groundwater upwelling are ubiquitous around the world and form ecologically and culturally important features of many landscapes. Spring carbonate deposits record past climatic and hydrological conditions. The reconstruction of past processes using spring carbonate proxies requires fundamental understanding of the factors that control their geometry. In this work, we show that the spatial extent of spring carbonate platforms is amenable to quantitative prediction by simulating the early growth stage of their formation for the iconic mound springs in the central Australian outback. We exploit their well-defined, circular geometry to demonstrate the existence of two size-limiting regimes: one controlled by the spring flow rate and the other by the concentration of lattice ions. Deviations between modelled and observed size metrics are attributable to diminishing spring flow rates since formation, enabling assessment of the relative vulnerability of springs to further hydrological change.
Erratum: Integrated surface-subsurface modeling of Fuxianhu Lake catchment, Southwest China (Water Resource Management (2009) vol. 23 10.1007/s11269-008-9377-y)
Publisher: Springer Science and Business Media LLC
Date: 08-08-2009
Hydrogeology and management of freshwater lenses on atoll islands: Review of current knowledge and research needs
Publisher: Elsevier BV
Date: 08-2017
Preventing Seawater Intrusion and Enhancing Safe Extraction Using Finite‐Length, Impermeable Subsurface Barriers: 3D Analysis
Publisher: American Geophysical Union (AGU)
Date: 11-2020
DOI: 10.1029/2020WR027792
Effects of River Partial Penetration on the Occurrence of Riparian Freshwater Lenses: Experimental Investigation
Publisher: American Geophysical Union (AGU)
Date: 11-2021
DOI: 10.1029/2021WR029728
Abstract: This study examines the occurrence of riparian lenses adjacent to partially penetrating, gaining rivers under the controlled conditions of a laboratory sand tank. Laboratory experiments and numerical modeling of the freshwater lens extent are used to provide physical verification (in light of limited ex les of well‐characterized field cases) of the analytical methodology, thereby evaluating the underlying assumptions. Parameter calibration and uncertainty analysis are applied to assess both the experimental conditions and the benefit of lens observations in applying the analytical approach. The experimental freshwater lens was reproduced by both analytical and numerical models, with the exception of small mismatches (between analytical results and measured data) in the lens thickness in the near‐river region. These are most likely due to vertical flow effects that arise from the partial river penetration and saltwater inflows to the river bottom, and that are only partly accounted for in the analytical approach. Uncertainty analysis highlighted that accurate lens predictions based on the analytical method requires calibration to direct lens measurements a similar finding from earlier studies of fully penetrating river conditions. Sensitivity analysis highlighted that the saltwater head boundary, freshwater and saltwater densities, and the aquifer depth below the riverbed (in descending order of sensitivity) are the most important factors in controlling freshwater lens occurrence and saltwater discharge. The results provide the first physical verification of the occurrence of stable riparian lenses adjacent to partially penetrating, gaining rivers, and verify a recent analytical solution for lens extent and saltwater discharge.
An exploration of coupled surface–subsurface solute transport in a fully integrated catchment model
Publisher: Elsevier BV
Date: 10-2015
Spatial periodic boundary condition for MODFLOW
Publisher: Wiley
Date: 27-06-2014
DOI: 10.1111/GWAT.12086
Abstract: Small-scale hyporheic zone (HZ) models often use a spatial periodic boundary (SPB) pair to simulate an infinite repetition of bedforms. SPB's are common features of commercially available multiphysics modeling packages. MODFLOW's lack of this boundary type has precluded it from being effectively utilized in this area of HZ research. We present a method to implement the SPB in MODFLOW by development of the appropriate block-centered finite-difference expressions. The implementation is analogous to MODFLOW's general head boundary package. The difference is that the terms on the right hand side of the solution equations must be updated with each iteration. Consequently, models that implement the SPB converge best with solvers that perform both inner and outer iterations. The correct functioning of the SPB condition in MODFLOW is verified by two ex les. This boundary condition allows users to build HZ-bedform models in MODFLOW, facilitating further research using related codes such as MT3DMS and PHT3D.
Improving salt leaching efficiency of subsurface drainage systems using low-permeability surface mulch
Publisher: Elsevier BV
Date: 04-2022
Rebuttal to “The case of the Biscayne Bay and aquifer near Miami, Florida: density-driven flow of seawater or gravitationally driven discharge of deep saline groundwater?” by Weyer (Environ Earth Sci 2018, 77:1–16)
Publisher: Springer Science and Business Media LLC
Date: 10-2018
An Initial Inventory and Indexation of Groundwater Mega-Depletion Cases
Publisher: Springer Science and Business Media LLC
Date: 09-11-2013
Revisiting analytical solutions for steady interface flow in subsea aquifers: Aquitard salinity effects
Publisher: Elsevier BV
Date: 06-2018
The influence of constrained fossil fuel emissions scenarios on climate and water resource projections
Publisher: Copernicus GmbH
Date: 21-06-2011
DOI: 10.5194/HESS-15-1879-2011
Abstract: Abstract. Water resources planning requires long-term projections of the impact of climate change on freshwater resources. In addition to intrinsic uncertainty associated with the natural climate, projections of climate change are subject to the combined uncertainties associated with selection of emissions scenarios, GCM ensembles and downscaling techniques. In particular, unknown future greenhouse gas emissions contribute substantially to the overall uncertainty. We contend that a reduction in uncertainty is possible by refining emissions scenarios. We present a comprehensive review of the growing body of literature that challenges the assumptions underlying the high-growth emissions scenarios (widely used in climate change impact studies), and instead points to a peak and decline in fossil fuel production occurring in the 21st century. We find that the IPCC's new RCP 4.5 scenario (low-medium emissions), as well as the B1 and A1T (low emissions) marker scenarios from the IPCC's Special Report on Emissions Scenarios are broadly consistent with the majority of recent fossil fuel production forecasts, whereas the medium to high emissions scenarios generally depend upon unrealistic assumptions of future fossil fuel production. We use a simple case study of projected climate change in 2070 for the Scott Creek catchment in South Australia to demonstrate that even with the current suite of climate models, by limiting projections to the B1 scenario, both the median change and the spread of model results are reduced relative to equivalent projections under an unrealistic high emissions scenario (A1FI).
Transient recharge estimability through field-scale groundwater model calibration
Publisher: Wiley
Date: 12-05-2017
DOI: 10.1111/GWAT.12526
Abstract: The estimation of recharge through groundwater model calibration is h ered by the nonuniqueness of recharge and aquifer parameter values. It has been shown recently that the estimability of spatially distributed recharge through calibration of steady-state models for practical situations (i.e., real-world, field-scale aquifer settings) is limited by the need for excessive amounts of hydraulic-parameter and groundwater-level data. However, the extent to which temporal recharge variability can be informed through transient model calibration, which involves larger water-level datasets, but requires the additional consideration of storage parameters, is presently unknown for practical situations. In this study, time-varying recharge estimates, inferred through calibration of a field-scale highly parameterized groundwater model, are systematically investigated subject to changes in (1) the degree to which hydraulic parameters including hydraulic conductivity (K) and specific yield (S
Replenishing an unconfined coastal aquifer to control seawater intrusion: Injection or infiltration?
Publisher: American Geophysical Union (AGU)
Date: 06-2017
DOI: 10.1002/2016WR019625
Mixed-Convective Processes Within Seafloor Sediments Arising From Fresh Groundwater Discharge
Publisher: Frontiers Media SA
Date: 22-04-2021
DOI: 10.3389/FENVS.2021.600955
Abstract: The dependence of near-shore ecosystems on the freshwater component of submarine groundwater discharge (SFGD) is well recognized. Previous studies of SFGD have typically assumed that SFGD occurs through aquitards that are in direct contact with seawater. These studies provide no guidance on the distribution of freshwater discharge to the seafloor where SFGD occurs through sandy sediments, even though in most situations, seabed sediments are permeable. We find that SFGD may occur in unconfined, seafloor sediments as density-driven flow in the form of fingers, or otherwise, diffusive freshwater discharge is also possible. Unstable, buoyancy-driven flow within seabed sediments follows similar patterns (except inverted) to the downward free convection of unstable (dense over less-dense groundwater) situations. Consequently, the same theoretical controlling factors as those developed for downward mixed-convective flow are expected to apply. Although, there are important differences, in particular the boundary conditions, between subsea freshwater-seawater interactions and previous mixed-convective problems. Simplified numerical experiments in SEAWAT indicate that the behavior of fresh buoyant plumes depends on the aquifer lower boundary, which in turn controls the rate and pattern of SFGD to the seafloor. This article provides an important initial step in the understanding of SFGD behavior in regions of sandy seafloor sediments and analyses for the first time the mixed-convective processes that occur when freshwater rises into an otherwise saline groundwater body.
Comment on ‘H.-C. Huang, Y.-C. Tan, C.-W. Liu and C.-H. Chen, A novel hysteresis model in unsaturated soil.Hydrological Processes 19 (2005) 1653–1665’
Publisher: Wiley
Date: 2007
DOI: 10.1002/HYP.6256
Experimental Analysis of Intermittent Pumping Effects on Seawater Intrusion
Publisher: American Geophysical Union (AGU)
Date: 28-12-2023
DOI: 10.1029/2022WR032269
Abstract: Time fluctuations of groundwater flux are known to affect solute transport and thus the width and penetration of seawater intrusion. Yet, most theoretical and laboratory studies of the mixed‐convective processes accompanying seawater intrusion assume constant extraction rates, even though real‐world pumping is usually intermittent. In this study, dynamic changes to an experimental saltwater wedge caused by intermittent pumping were explored using sand tank experiments and numerical simulation. Three different aquifer systems were assessed: a homogeneous unconfined aquifer, and two stratified systems (aquifer‐aquitard‐aquifer), with the latter having an aquitard of lower permeability. Both fully and partially penetrating wells were used. The effects of the pumping period and no‐pumping period were explored, with nine laboratory experiments performed in total. The overall finding is that the impact of intermittent pumping is non‐trivial. Under the laboratory conditions, where head was prescribed inland (representative of a surface water body) intermittent pumping allowed larger volumes of freshwater to be extracted before well salinization. This reflects that non‐pumping periods allow the aquifer to recover. Additional experiments and numerical modeling, which reproduced reasonably well the experimental observations, showed that well salinization could be avoided altogether with sufficient periods of recovery. Numerical models were also used to compare intermittent and constant pumping for the same total extraction rate, showing that intermittent pumping caused earlier well salinization compared to constant pumping, although the aquifer contained a greater mass of salt under constant pumping.
Comment on “Closed-form analytical solutions for assessing the consequences of sea-level rise on groundwater resources in sloping coastal aquifers”: paper published in Hydrogeology Journal (2015) 23:1399–1413, by R. Chesnaux
Publisher: Springer Science and Business Media LLC
Date: 28-03-2016
Partially penetrating lake-aquifer interaction in a laboratory-scale tidal setting
Publisher: Elsevier BV
Date: 12-2021
Characterisation of sea-water intrusion in the Pioneer Valley, Australia using hydrochemistry and three-dimensional numerical modelling
Publisher: Springer Science and Business Media LLC
Date: 25-10-2006
Vertical leakage in sharp-interface seawater intrusion models of layered coastal aquifers
Publisher: Elsevier BV
Date: 11-2014
Hysteretic relationships in inundation dynamics for a large lake-floodplain system
Publisher: Elsevier BV
Date: 08-2015
Combined geophysical and analytical methods to estimate offshore freshwater extent
Publisher: Elsevier BV
Date: 09-2019
A Spatially Periodic Solute Boundary for MT3DMS and PHT3D
Publisher: Wiley
Date: 14-12-2017
DOI: 10.1111/GWAT.12490
Abstract: The assumption of spatial repetition is commonly made when producing bedform scale models of the hyporheic zone. Two popular solute transport codes, MT3DMS and PHT3D, do not currently provide the necessary boundary condition required to simulate spatial periodicity in hyporheic zone transport problems. In this study, we develop a spatially periodic boundary (SPB) for solutes that is compatible with a SPB that was previously developed for MODFLOW to simulate the flow component of spatially periodic problems. The approach is ideal for simulating groundwater flow and transport patterns under repeating surface features, such as ripples or dunes on the bottom of a lake or stream. The appropriate block-centered finite-difference approach to implement the boundary is presented and the necessary source code modifications are discussed. The performance of the solute SPB, operating in conjunction with the groundwater flow SPB, is explored through comparison of a multi-bedform hyporheic-zone model with a single bedform variant. The new boundary conditions perform well in situations where both dispersive effects and lateral seepage flux in the underflow regime beneath the hyporheic zone are minimal.
Impact of Sea‐Level Rise on Sea Water Intrusion in Coastal Aquifers
Publisher: Wiley
Date: 23-02-2009
DOI: 10.1111/J.1745-6584.2008.00535.X
Abstract: Despite its purported importance, previous studies of the influence of sea-level rise on coastal aquifers have focused on specific sites, and a generalized systematic analysis of the general case of the sea water intrusion response to sea-level rise has not been reported. In this study, a simple conceptual framework is used to provide a first-order assessment of sea water intrusion changes in coastal unconfined aquifers in response to sea-level rise. Two conceptual models are tested: (1) flux-controlled systems, in which ground water discharge to the sea is persistent despite changes in sea level, and (2) head-controlled systems, whereby ground water abstractions or surface features maintain the head condition in the aquifer despite sea-level changes. The conceptualization assumes steady-state conditions, a sharp interface sea water-fresh water transition zone, homogeneous and isotropic aquifer properties, and constant recharge. In the case of constant flux conditions, the upper limit for sea water intrusion due to sea-level rise (up to 1.5 m is tested) is no greater than 50 m for typical values of recharge, hydraulic conductivity, and aquifer depth. This is in striking contrast to the constant head cases, in which the magnitude of salt water toe migration is on the order of hundreds of meters to several kilometers for the same sea-level rise. This study has highlighted the importance of inland boundary conditions on the sea-level rise impact. It identifies combinations of hydrogeologic parameters that control whether large or small salt water toe migration will occur for any given change in a hydrogeologic variable.
Timescales of seawater intrusion and retreat
Publisher: Elsevier BV
Date: 09-2013
Spatial variability of chloride deposition in a vegetated coastal area: Implications for groundwater recharge estimation
Publisher: Elsevier BV
Date: 11-2014
Evaporation and Salt Accumulation Effects on Riparian Freshwater Lenses
Publisher: American Geophysical Union (AGU)
Date: 25-11-2020
DOI: 10.1029/2019WR026380
Tidal impacts on riparian salinities near estuaries
Publisher: Elsevier BV
Date: 09-2006
Saltwater upconing zone of influence
Publisher: Elsevier BV
Date: 08-2016
Effects of porous media thickness and its hydraulic gradient history on the formation of sand boils
Publisher: Elsevier BV
Date: 07-2023
Developing adaptive management guidance for groundwater planning and development
Publisher: Elsevier BV
Date: 11-2022
Identifying groundwater recharge and discharge zones using geostatistical simulation of hydraulic head and its derivatives
Publisher: Elsevier BV
Date: 02-2023
Proceedings of the National Coastal Groundwater Management Knowledge Transfer Workshop
Publisher: Geoscience Australia
Date: 2014
Estimating hydraulic properties from tidal propagation in circular islands
Publisher: Elsevier BV
Date: 07-2021
Influence of hysteresis on tidal capillary fringe dynamics in a well-sorted sand
Publisher: Elsevier BV
Date: 11-2003
Estimability of recharge through groundwater model calibration: Insights from a field-scale steady-state example
Publisher: Elsevier BV
Date: 09-2016
Characteristics of active seawater intrusion
Publisher: Elsevier BV
Date: 08-2017
Riparian Freshwater Lens Response to Flooding
Publisher: American Geophysical Union (AGU)
Date: 03-2023
DOI: 10.1029/2022WR033309
Abstract: The freshwater lenses (“lenses” hereafter) within saline floodplain aquifers are sensitive to river flooding events. However, the effects of extensive floodplain inundation on saline aquifers are rarely considered and have not been examined previously under controlled laboratory conditions. We conducted laboratory experiments within a two‐dimensional (cross‐section) sand tank (i.e., representing a saline floodplain aquifer) and built both laboratory‐ and field‐scale numerical models to examine lens responses to flood events. Three sets of experiments were performed to explore different lateral extents of floodplain inundation. The temporal behavior of experimental lenses was quantified and compared to variable‐density numerical models that adopted calibrated laboratory parameters, showing good agreement. Results show that more extensive floodplain inundation leads to larger lenses (as expected). The sensitivity analysis was performed based on field‐scale numerical models, demonstrating that the floodplain inundation extent, hydraulic conductivity, and dispersivity are key factors controlling the post‐flood recession in lens extent and volume. In field‐scale simulations of floodplain inundation, the entire lens was significantly salinized during flood recession due to enhanced dispersion accompanying higher groundwater velocities, which may further split into several isolated freshwater bodies before eventually returning to steady‐state conditions. Importantly, field‐scale numerical results indicated that the salt load to the adjacent river increased immediately following the flood event, consistent with reporting of the River Murray (South Australia). These results provide critical new insights into relationships between flood events and the behavior of lenses, highlighting the significance of flooding events on both intermediate and long‐term conditions of saline floodplains.
Analytical, Experimental, and Numerical Investigation of Partially Penetrating Barriers for Expanding Island Freshwater Lenses
Publisher: American Geophysical Union (AGU)
Date: 03-2021
DOI: 10.1029/2020WR028386
Abstract: Freshwater lenses are of great importance in supporting both the vulnerable ecosystems of small‐to‐medium oceanic islands and the lives of local inhabitants. Recently, an engineering approach that embeds a low‐permeability, fully penetrating barrier along the shoreline was proposed and demonstrated under controlled conditions to be effective in enhancing island lens size. The current study extends that work by investigating the effect of partially penetrating barriers placed at the shoreline on both circular and strip island lenses, using: (1) sharp‐interface analytical solutions, (2) dispersive numerical modeling, and (3) sand tank experimentation. Analytical, experimental, and numerical results are in reasonable agreement in terms of the freshwater‐seawater interface. The findings indicate that partially penetrating barriers of sufficient depth (i.e., the freshwater depth in barrier from the fully penetrating barrier case) produce comparable results to fully penetrating barriers, and therefore, the former is more cost‐effectiveness. Moreover, the minimum barrier depth (i.e., the “critical depth”) required to obtain approximately the same lens as that achieved using the fully penetrating barrier is estimable from the analytical solution, as verified by laboratory experiments and numerical simulations. The sensitivity analysis based on the analytical solution indicates that a lower barrier permeability and a greater barrier thickness, which lead to a higher freshwater storage (as expected), require a larger critical depth. The guidance on the design of partially penetrating shoreline barriers arising from this research adds to existing engineering techniques for enhancing freshwater resources on circular and strip islands.
A review of seawater intrusion and its management in Australia
Publisher: Springer Science and Business Media LLC
Date: 14-04-2010
Evaluation of management scenarios for potable water supply using script-based numerical groundwater models of a freshwater lens
Publisher: Elsevier BV
Date: 04-2019
Applicability of analytical solutions to tidal propagation in circular islands
Publisher: Elsevier BV
Date: 10-2020
Transience of seawater intrusion in response to sea level rise
Publisher: American Geophysical Union (AGU)
Date: 12-2010
DOI: 10.1029/2010WR009564
Heat and Solute Tracers: How Do They Compare in Heterogeneous Aquifers?
Publisher: Wiley
Date: 09-12-2013
DOI: 10.1111/GWAT.12146
Abstract: A comparison of groundwater velocity in heterogeneous aquifers estimated from hydraulic methods, heat and solute tracers was made using numerical simulations. Aquifer heterogeneity was described by geostatistical properties of the Borden, Cape Cod, North Bay, and MADE aquifers. Both heat and solute tracers displayed little systematic under- or over-estimation in velocity relative to a hydraulic control. The worst cases were under-estimates of 6.63% for solute and 2.13% for the heat tracer. Both under- and over-estimation of velocity from the heat tracer relative to the solute tracer occurred. Differences between the estimates from the tracer methods increased as the mean velocity decreased, owing to differences in rates of molecular diffusion and thermal conduction. The variance in estimated velocity using all methods increased as the variance in log-hydraulic conductivity (K) and correlation length scales increased. The variance in velocity for each scenario was remarkably small when compared to σ2 ln(K) for all methods tested. The largest variability identified was for the solute tracer where 95% of velocity estimates ranged by a factor of 19 in simulations where 95% of the K values varied by almost four orders of magnitude. For the same K-fields, this range was a factor of 11 for the heat tracer. The variance in estimated velocity was always lowest when using heat as a tracer. The study results suggest that a solute tracer will provide more understanding about the variance in velocity caused by aquifer heterogeneity and a heat tracer provides a better approximation of the mean velocity.
Occurrence of seawater intrusion overshoot
Publisher: American Geophysical Union (AGU)
Date: 04-2015
DOI: 10.1002/2014WR016329
Influences on the carbonate hydrochemistry of mound spring environments, Lake Eyre South region, South Australia
Publisher: Elsevier BV
Date: 02-2012
Integrated surface-subsurface modeling of Fuxianhu Lake catchment, Southwest China
Publisher: Springer Science and Business Media LLC
Date: 06-12-2009
On the interpretation of coastal aquifer water level trends and water balances: A precautionary note
Publisher: Elsevier BV
Date: 11-2012
Plausibility of freshwater lenses adjacent to gaining rivers
Publisher: American Geophysical Union (AGU)
Date: 11-2016
DOI: 10.1002/2016WR019400
Abstract: The occurrence of freshwater lenses in saline aquifers adjoining gaining rivers has recently been demonstrated as being theoretically possible by way of analytical solution. However, physical evidence for freshwater lenses near gaining rivers is limited largely to airborne geophysical surveys. This paper presents the first direct observations of freshwater lenses adjacent to gaining rivers, albeit at the laboratory‐scale, as validation of their plausibility. The experimental conditions are consistent with the available analytical solution, which is compared with laboratory observations of lens extent and the saltwater flow rate, for various hydraulic gradients. Numerical simulation shows that dispersion can account for the small amount of mismatch between the sharp‐interface analytical solution and laboratory measurements. Calibration and uncertainty analysis demonstrate that accurate mathematical predictions require calibration to laboratory measurements of the lens. The results provide unequivocal proof that freshwater lenses can persist despite gaining river conditions concordant with theoretical lenses predicted by the analytical solution, at least within the constraints of the experimental setup.
On the implementation of the surface conductance approach using a block-centred surface–subsurface hydrology model
Publisher: Elsevier BV
Date: 07-2013
Tidal controls on coastal groundwater conditions: field investigation of a macrotidal system
Publisher: Informa UK Limited
Date: 12-2009
Modelling the impact of runoff generation on agricultural and urban phosphorus loading of the subtropical Poyang Lake (China)
Publisher: Elsevier BV
Date: 11-2020
A hydraulic mixing-cell method to quantify the groundwater component of streamflow within spatially distributed fully integrated surface water-groundwater flow models
Publisher: Elsevier BV
Date: 07-2011
Artificial pumping errors in the Kool–Parker scaling model of soil moisture hysteresis
Publisher: Elsevier BV
Date: 06-2006
Three-Dimensional Seawater Intrusion Modelling of Uley South Basin, South Australia
Publisher: Springer Netherlands
Date: 2013
Variable density groundwater flow: From modelling to applications
Publisher: Cambridge University Press
Date: 09-09-2010
Spatial periodicity in bed form-scale solute and thermal transport models of the hyporheic zone
Publisher: American Geophysical Union (AGU)
Date: 10-2014
DOI: 10.1002/2014WR015361
Mound springs in the arid Lake Eyre South Region of South Australia: A new depositional tufa model and its controls
Publisher: Elsevier BV
Date: 10-2011
Groundwater flow systems theory: research challenges beyond the specified-head top boundary condition
Publisher: Springer Science and Business Media LLC
Date: 30-03-2016
Coastal aquifers: Scientific advances in the face of global environmental challenges
Publisher: Elsevier BV
Date: 08-2017
Seawater intrusion in fractured coastal aquifers: A preliminary numerical investigation using a fractured Henry problem
Publisher: Elsevier BV
Date: 11-2015
Bias of apparent tracer ages in heterogeneous environments
Publisher: Wiley
Date: 02-04-2014
DOI: 10.1111/GWAT.12052
Abstract: The interpretation of apparent ages often assumes that a water s le is composed of a single age. In heterogeneous aquifers, apparent ages estimated with environmental tracer methods do not reflect mean water ages because of the mixing of waters from many flow paths with different ages. This is due to nonlinear variations in atmospheric concentrations of the tracer with time resulting in biases of mixed concentrations used to determine apparent ages. The bias of these methods is rarely reported and has not been systematically evaluated in heterogeneous settings. We simulate residence time distributions (RTDs) and environmental tracers CFCs, SF6 , (85) Kr, and (39) Ar in synthetic heterogeneous confined aquifers and compare apparent ages to mean ages. Heterogeneity was simulated as both K-field variance (σ(2) ) and structure. We demonstrate that an increase in heterogeneity (increase in σ(2) or structure) results in an increase in the width of the RTD. In low heterogeneity cases, widths were generally on the order of 10 years and biases generally less than 10%. In high heterogeneity cases, widths can reach 100 s of years and biases can reach up to 100%. In cases where the temporal variations of atmospheric concentration of in idual tracers vary, different patterns of bias are observed for the same mean age. We show that CFC-12 and CFC-113 ages may be used to correct for the mean age if analytical errors are small.
An assessment of seawater intrusion overshoot using physical and numerical modeling
Publisher: American Geophysical Union (AGU)
Date: 10-2013
DOI: 10.1002/WRCR.20526
Interpreting streamflow generation mechanisms from integrated surface-subsurface flow models of a riparian wetland and catchment
Publisher: American Geophysical Union (AGU)
Date: 09-2013
DOI: 10.1002/WRCR.20405
On the effects of preferential or barrier flow features on solute plumes in permeable porous media
Publisher: Elsevier BV
Date: 12-2016
A Correction on Coastal Heads for Groundwater Flow Models
Publisher: Wiley
Date: 24-02-2014
DOI: 10.1111/GWAT.12172
Abstract: We introduce a simple correction to coastal heads for constant-density groundwater flow models that contain a coastal boundary, based on previous analytical solutions for interface flow. The results demonstrate that accurate discharge to the sea in confined aquifers can be obtained by direct application of Darcy's law (for constant-density flow) if the coastal heads are corrected to ((α + 1)/α)hs - B/2α, in which hs is the mean sea level above the aquifer base, B is the aquifer thickness, and α is the density factor. For unconfined aquifers, the coastal head should be assigned the value hs1+α/α. The accuracy of using these corrections is demonstrated by consistency between constant-density Darcy's solution and variable-density flow numerical simulations. The errors introduced by adopting two previous approaches (i.e., no correction and using the equivalent fresh water head at the middle position of the aquifer to represent the hydraulic head at the coastal boundary) are evaluated. Sensitivity analysis shows that errors in discharge to the sea could be larger than 100% for typical coastal aquifer parameter ranges. The location of observation wells relative to the toe is a key factor controlling the estimation error, as it determines the relative aquifer length of constant-density flow relative to variable-density flow. The coastal head correction method introduced in this study facilitates the rapid and accurate estimation of the fresh water flux from a given hydraulic head measurement and allows for an improved representation of the coastal boundary condition in regional constant-density groundwater flow models.
Has the Three-Gorges Dam made the Poyang Lake wetlands wetter and drier?
Publisher: American Geophysical Union (AGU)
Date: 18-10-2012
DOI: 10.1029/2012GL053431
Regional-scale, fully coupled modelling of stream-aquifer interaction in a tropical catchment
Publisher: Elsevier BV
Date: 09-2006
Satellite image-based investigation of the seasonal variations in the hydrological connectivity of a large floodplain (Poyang Lake, China)
Publisher: Elsevier BV
Date: 06-2020
Quantifying climate and pumping contributions to aquifer depletion using a highly parameterised groundwater model: Uley South Basin (South Australia)
Publisher: Elsevier BV
Date: 04-2015
Groundwater in the Coastal Zones of Asia-Pacific -- Application of a rapid-assessment method for seawater intrusion vulnerability: Willunga Basin, South Australia
Publisher: Springer Netherlands
Date: 2013
Expanding Freshwater Lenses Adjacent to Gaining Rivers Through Vertical Low‐Hydraulic‐Conductivity Barriers: Analytical and Experimental Validation
Publisher: American Geophysical Union (AGU)
Date: 02-2020
DOI: 10.1029/2019WR025750
Abstract: Freshwater lenses within riparian zones of some arid and semiarid settings assist in maintaining the health of riparian ecosystems. We propose an approach for expanding freshwater lenses in saline aquifers adjacent to gaining rivers through the addition of a vertical barrier of low‐hydraulic‐conductivity (low‐ K ) parallel to the river bank. Sharp‐interface analytical solutions for the lens shape and water table distribution are developed to examine the effectiveness of the proposed method and are verified using sand tank experiments and numerical simulations. The sensitivity analysis is used to apply the method to parameters typical of the Lower River Murray (South Australia) and its floodplain aquifers. The results show that the barrier can create significant freshwater lenses in head‐controlled systems, whereas the barrier may lead to lens shrinkage in flux‐controlled systems due to saline water table rise. That is, the effectiveness of the barrier is highly dependent on the inland boundary condition. The analytical solution presented herein can be used to efficiently predict the riparian freshwater lens extent in response to engineered barriers, adding to existing techniques for studying and modifying riparian freshwater lenses.
On the classification of seawater intrusion
Publisher: Elsevier BV
Date: 08-2017
Seawater Intrusion Under Current Sea-Level Rise: Processes Accompanying Coastline Transgression
Publisher: Springer Netherlands
Date: 2013
Terrestrial freshwater lenses in stable riverine settings: Occurrence and controlling factors
Publisher: American Geophysical Union (AGU)
Date: 05-2016
DOI: 10.1002/2015WR018346
Maximizing Net Extraction Using an Injection‐Extraction Well Pair in a Coastal Aquifer
Publisher: Wiley
Date: 08-08-2012
DOI: 10.1111/J.1745-6584.2012.00973.X
Abstract: In this study, we examine the maximum net extraction rate from the novel arrangement of an injection-extraction well pair in a coastal aquifer, where fresh groundwater is reinjected through the injection well located between the interface toe and extraction well. Complex potential theory is employed to derive a new analytical solution for the maximum net extraction rate and corresponding stagnation-point locations and recirculation ratio, assuming steady-state, sharp-interface conditions. The injection-extraction well-pair system outperforms a traditional single extraction well in terms of net extraction rate for a broad range of well placement and pumping rates, which is up to 50% higher for an aquifer with a thickness of 20 m, hydraulic conductivity of 10 m/d, and fresh water influx of 0.24 m(2) /d. Sensitivity analyses show that for a given fresh water discharge from an inland aquifer, a larger maximum net extraction is expected in cases with a smaller hydraulic conductivity or a smaller aquifer thickness, notwithstanding physical limits to drawdown at the pumping well that are not considered here. For an extraction well with a fixed location, the optimal net extraction rate linearly increases with the distance between the injection well and the sea, and the corresponding injection rate and recirculation ratio also increase. The analytical analysis in this study provides initial guidance for the design of well-pair systems in coastal aquifers, and is therefore an extension beyond previous applications of analytical solutions of coastal pumping that apply only to extraction or injection wells.
Seawater intrusion vulnerability indicators for freshwater lenses in strip islands
Publisher: Elsevier BV
Date: 2014
An investigation of enhanced recessions in Poyang Lake: Comparison of Yangtze River and local catchment impacts
Publisher: Elsevier BV
Date: 09-2014
Groundwater ages in coastal aquifers
Publisher: Elsevier BV
Date: 07-2013
Effects of stream nitrate data frequency on watershed model performance and prediction uncertainty
Publisher: Elsevier BV
Date: 02-2019
Influence of variable salinity conditions in a tidal creek on riparian groundwater flow and salinity dynamics
Publisher: Elsevier BV
Date: 09-2009
Discussion on Experimental observations of saltwater up-coning by Werner, A.D., Jakovovic, D., Simmons, C.T., 2009. Journal of Hydrology 373, 230-241
Publisher: Elsevier BV
Date: 08-2012
Hydrodynamic and Hydrological Modeling of the Poyang Lake Catchment System in China
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2014
Coupled Effects of Density and Dual‐Domain Mass Transfer on Aquifer Storage and Recovery
Publisher: American Geophysical Union (AGU)
Date: 08-2022
DOI: 10.1029/2021WR031445
Abstract: Aquifer storage and recovery (ASR) involves the injection of freshwater into an aquifer for temporary water storage and later use. Previous studies have shown that density‐driven convection may render part of the injectant unrecoverable when ASR is implemented in a saline aquifer. Where heterogeneity creates a significant proportion of immobile groundwater, dual‐domain (immobile and mobile porosities) effects also lead to reductions in the efficiency of ASR schemes. Presuming constant total porosity (sum of the mobile and immobile porosities), the combined effects of dual‐domain properties and water density on ASR are investigated for the first time in the present study, using numerical modeling of otherwise similar conceptual models to previous ASR analyses. Results show that the interactions between the density effect and dual‐domain mass transfer lead to complex controlling patterns of the density contrast, the ratio of immobile‐mobile porosities, the parameterization of immobile‐mobile solute exchange, and the number of cycles. The influence of these factors on mixing processes and the recovery efficiency (proportion of freshwater injectant recovered by extraction) during ASR are shown. Dual‐domain effects, where they occur in aquifers, must be included explicitly in models to reproduce recovery efficiencies, especially during early cycles, unless the immobile porosity is very small or the conductance between mobile and immobile regions is at extremes. Otherwise, a single‐domain model can be utilized. The findings of this research illustrate the influence of both density effects and dual‐domain processes on ASR and the need to account for both in assessing ASR feasibility in complex hydrogeological settings.
Science, society, and the coastal groundwater squeeze
Publisher: American Geophysical Union (AGU)
Date: 04-2017
DOI: 10.1002/2017WR020851
Water table salinization due to seawater intrusion
Publisher: American Geophysical Union (AGU)
Date: 10-2015
DOI: 10.1002/2015WR017098
Investigating the influence of aquifer heterogeneity on the potential for thermal free convection in the Yarragadee Aquifer, Western Australia
Publisher: Springer Science and Business Media LLC
Date: 18-09-2014
Evaluation of outputs from automated baseflow separation methods against simulated baseflow from a physically based, surface water-groundwater flow model
Publisher: Elsevier BV
Date: 08-2012
Karst aquifer recharge: Comments on Somaratne, N. characteristics of point recharge in Karst aquifers. water 2014, 6, 2782-2807
Publisher: MDPI AG
Date: 28-11-2014
DOI: 10.3390/W6123727
Speed of free convective fingering in porous media
Publisher: American Geophysical Union (AGU)
Date: 11-2011
DOI: 10.1029/2011WR010555
Analytical and Experimental Investigation of the Impact of Land Reclamation on Steady‐State Seawater Extent in Coastal Aquifers
Publisher: American Geophysical Union (AGU)
Date: 06-2021
DOI: 10.1029/2020WR029028
Abstract: Previous studies of the effects of land reclamation on the extent of seawater in coastal aquifers have assumed that the reclaimed area penetrates to the impermeable base of aquifer, and that the seawater in the aquifer is entirely contained within reclaimed sediments. The current study extends previous research into the effects of reclamation on groundwater levels and seawater extent by developing new analytical expressions for the steady‐state heads and non‐dispersive freshwater‐seawater interface for situations where reclaimed soils overly permeable aquifer material. Situations involving reclaimed soils that are more permeable or less permeable than the original aquifer are explored. Sand‐tank experiments and associated numerical simulations (in 2D cross section) were undertaken to evaluate assumptions adopted in developing the solutions, which include an empirical correction to account for dispersion effects. Sand tank solute distributions are well matched to numerical modeling results, and provide validation of analytical solutions and the associated simplifications. Application of the new solution demonstrates that both the water level rise and the seaward shift of seawater extent caused by reclamation are modified with the inclusion of the underlying permeable layer, depending on permeability contrasts and the reclaimed area size. For ex le, if the reclaimed soil is less permeable than the original aquifer, water level rise and the seawater extent shift are reduced with the inclusion of an underlying permeable layer. The analytical solution developed in this study can provide rapid guidance on the changes to seawater extent and groundwater levels caused by land reclamation in otherwise permeable substrate.
Seawater intrusion processes, investigation and management: Recent advances and future challenges
Publisher: Elsevier BV
Date: 2013
Sustainable management of groundwater extraction: An Australian perspective on current challenges
Publisher: Elsevier BV
Date: 12-2022
Assessment of the reliability of popular satellite products in characterizing the water balance of the Yangtze River Basin, China
Publisher: IWA Publishing
Date: 27-01-2016
DOI: 10.2166/NH.2016.138
Abstract: This study investigates the water balance of the Yangtze River Basin (YRB) during 2003–2012 using the Tropical Rainfall Measuring Mission precipitation, the Moderate Resolution Imaging Spectroradiometer evapotranspiration and the Gravity Recovery and Climate Experiment total water storage change. The bias, absolute error and correlation coefficient are used to quantify water balance performances at monthly and annual time steps. The results show that the absolute error in the YRB water balance was 18.1 mm/month and 152.5 mm/yr at monthly and annual time steps accounting for 20% and 14% of YRB precipitation, respectively. The three satellite products were combined through a water balance equation to estimate monthly and annual stream flow, which was in error by 19.4 mm/month and 76.7 mm/yr, accounting for 22% and 7% of YRB precipitation, respectively. Trends in YRB water balance components at annual time steps obtained from satellite products were in the range 83–318% of the corresponding trends from alternative datasets (e.g., ground-based measurements, land-surface modelling, etc.), which performed significantly better than monthly time series. The results indicate that the YRB water balance can be evaluated using multiple satellite products to a reasonable accuracy at annual time steps.
Evaluating the Effects of River Partial Penetration on the Occurrence of Riparian Freshwater Lenses
Publisher: Wiley
Date: 16-02-2021
Natural saltwater upconing by preferential groundwater discharge through boils
Publisher: Elsevier BV
Date: 05-2013
Fully integrated modeling of surface‐subsurface solute transport and the effect of dispersion in tracer hydrograph separation
Publisher: American Geophysical Union (AGU)
Date: 10-2014
DOI: 10.1002/2013WR015040
Transience of Riparian Freshwater Lenses
Publisher: American Geophysical Union (AGU)
Date: 05-2022
DOI: 10.1029/2021WR031310
Abstract: The current theory for defining the occurrence of riparian lenses (i.e., buoyant, lenticular‐shaped fresh groundwater bodies overlying saline groundwater in riparian zones) is largely based on steady‐state analyses, which neglect the transient dynamics expected in real‐world settings. In this study, the transience of riparian lens movement is investigated for the first time, considering a fully penetrating, gaining river (i.e., the river receives groundwater influxes), and rapid variations in hydraulic boundary conditions. Controlled laboratory experiments and numerical modeling are used to determine the timescales associated with lens movements. Both numerical and experimental timescales show asymmetric behavior in the growth and decline of lenses, whereby growing lenses involve longer timescales than those of shrinking lenses. Inverse relationships between timescales and final hydraulic gradients are observed, such that higher final hydraulic gradients involved shorter timescales. Results also revealed a time lag in the movement of the lens tip (i.e., where the lens and water table intersect) relative to the lens toe (i.e., intersection of the lens with the riverbank). Riparian lenses have near‐identical timescales regardless of whether the river water or aquifer hydraulic head varies, and rather, timescales are more sensitive to the final hydraulic gradient. Application of typical parameter ranges for the River Murray (South Australia) floodplains reveals timescales of years to more than a decade to expand the riparian lens by tens of meters. Insights into riparian lenses transience attained from the current study build on the understanding of transience obtained for other mixed‐convective hydrogeological processes, such as seawater intrusion and retreat.
Experimental observations of saltwater up-coning
Publisher: Elsevier BV
Date: 06-2009
Vulnerability indicators of sea water intrusion
Publisher: Wiley
Date: 24-03-2012
DOI: 10.1111/J.1745-6584.2011.00817.X
Abstract: In this paper, simple indicators of the propensity for sea water intrusion (SWI) to occur (referred to as "SWI vulnerability indicators") are devised. The analysis is based on an existing analytical solution for the steady-state position of a sharp fresh water-salt water interface. Interface characteristics, that is, the wedge toe location and sea water volume, are used in quantifying SWI in both confined and unconfined aquifers. Rates-of-change (partial derivatives of the analytical solution) in the wedge toe or sea water volume are used to quantify the aquifer vulnerability to various stress situations, including (1) sea-level rise (2) change in recharge (e.g., due to climate change) and (3) change in seaward discharge. A selection of coastal aquifer cases is used to apply the SWI vulnerability indicators, and the proposed methodology produces interpretations of SWI vulnerability that are broadly consistent with more comprehensive investigations. Several inferences regarding SWI vulnerability arise from the analysis, including: (1) sea-level rise impacts are more extensive in aquifers with head-controlled rather than flux-controlled inland boundaries, whereas the opposite is true for recharge change impacts (2) sea-level rise does not induce SWI in constant-discharge confined aquifers (3) SWI vulnerability varies depending on the causal factor, and therefore vulnerability composites are needed that differentiate vulnerability to such threats as sea-level rise, climate change, and changes in seaward groundwater discharge. We contend that the approach is an improvement over existing methods for characterizing SWI vulnerability, because the method has theoretical underpinnings and yet calculations are simple, although the coastal aquifer conceptualization is highly idealized.
Alongshore freshwater circulation in offshore aquifers
Publisher: Elsevier BV
Date: 02-2021
Influence of soil moisture hysteresis on the functioning of capillary barriers
Publisher: Wiley
Date: 06-03-2009
DOI: 10.1002/HYP.7261
Related Organisations
Related Funding Activities
Linkage Projects - Grant ID: LP150100588
Start Date: 05-2016
End Date: 07-2021
Amount: $420,000.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP140100317
Start Date: 05-2015
End Date: 07-2019
Amount: $294,000.00
Funder: Australian Research Council
View Funded ActivityARC Future Fellowships - Grant ID: FT150100403
Start Date: 05-2016
End Date: 08-2020
Amount: $919,052.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP210100430
Start Date: 07-2021
End Date: 06-2024
Amount: $897,337.00
Funder: Australian Research Council
View Funded ActivityLinkage Infrastructure, Equipment And Facilities - Grant ID: LE230100038
Start Date: 2023
End Date: 12-2024
Amount: $387,250.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP190100713
Start Date: 01-2021
End Date: 01-2024
Amount: $340,357.00
Funder: Australian Research Council
View Funded ActivitySpecial Research Initiatives - Grant ID: NCGRT
Start Date: 07-2009
End Date: 12-2015
Amount: $14,999,996.00
Funder: Australian Research Council
View Funded Activity