ORCID Profile
0000-0001-7356-9909
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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.
Groundwater Hydrology | Environmental Engineering Modelling | Physical Geography and Environmental Geoscience | Environmental Engineering | Environmental Engineering Modelling | Surfacewater Hydrology | Hydrogeology | Soil Sciences | Social And Community Psychology | Environmental Technologies | Environmental Management And Rehabilitation | Physical Oceanography | Other Chemical Sciences | Environmental Chemistry (incl. Atmospheric Chemistry) | Environmental Management | Soil And Water Sciences Not Elsewhere Classified |
Land and water management | Integrated (ecosystem) assessment and management | Land and water management | Physical and chemical conditions | Ecosystem Assessment and Management of Coastal and Estuarine Environments | Land and water management | Urban and Industrial Land Management | Coastal and Estuarine Soils | Land and water management | Environmental health | Environmental Health
Publisher: American Geophysical Union (AGU)
Date: 10-1999
DOI: 10.1029/1999WR900197
Publisher: American Geophysical Union (AGU)
Date: 05-2013
DOI: 10.1002/WRCR.20227
Publisher: Elsevier BV
Date: 09-2006
Publisher: Elsevier BV
Date: 04-2015
Publisher: CSIRO Publishing
Date: 2015
DOI: 10.1071/FP14141
Abstract: Plant–plant interactions are particularly complex in multi-resource limited environments. The aim of this study was to assess species interactions in estuarine wetlands where both N and fresh water are limited. We combined stable isotope methods and dissimilarity analyses to compare interspecific interactions in N source use and water source use. Both Melaleuca quinquenervia (Cav.) S. T Blake and Avicennia marina (Forssk.) Vierh. had a lower leaf δ15N when they were growing together with the N-fixer Casuarina glauca Sieb. ex Spreng. compared with those trees growing in monospecific stands, but their water isotopes, δ18O and δD, were different from C. glauca. Our results indicate that the N-fixer C. glauca shared their N with co-existing neighbours, either indirectly or directly, but that water sources were partitioned among them. Further analyses showed that M. quinquenervia and C. glauca had lower dissimilarity in N source use but higher dissimilarity in water source use than the C. glauca–A. marina pair, implying that the co-existence between M. quinquenervia and C. glauca is relatively stable. Our results suggest that facilitative interaction and resource partitioning can co-occur in estuarine wetlands, and which could be important in maintaining ersity across resource gradients.
Publisher: Oxford University Press (OUP)
Date: 16-02-2014
DOI: 10.1093/AOB/MCT311
Publisher: Canadian Science Publishing
Date: 06-2012
DOI: 10.1139/L2012-050
Abstract: This paper aims to examine capillarity effect on flows in the drainage layer of highway pavement. A two-dimensional (2-D) model based on the Richards equation was used to simulate saturated and unsaturated flows in the drainage layer. For comparison, flows were also simulated using a 1-D Boussinesq equation based model and a 2-D model based on the Laplace equation, both assuming saturated flow only. The drainage layer was modeled with sand and gravel, which possess similar hydraulic properties to those of commonly used filling materials in practice. The results showed that the two saturated flow models agreed well with each other, indicating the dominance of horizontal flow in the drainage layer. However, their predictions differed significantly from those of the variably saturated flow models. The latter model predicted significant flow activities in a relatively large unsaturated zone, especially for a sandy drainage layer. Such unsaturated flow contributes to and enhances the capacity of the drainage layer. With the unsaturated flow neglected, the saturated flow models over-predicted the extent of the saturated zone and hence the groundwater table elevation. As the current engineering design of the drainage layer is typically based on the groundwater table elevation predicted by the saturated flow models, the finding of this study suggests that the design criterion is likely to lead to over-design of the drainage system. Further work is also required to prove the practical significance of the capillary effect and account for other factors.
Publisher: Elsevier BV
Date: 08-2009
DOI: 10.1016/J.JCIS.2009.04.006
Abstract: A recent paper reported capillary rise and evaporation experiments in metallic wicks, as well as a mathematical model. The authors found a consistent discrepancy between the model predictions and data: The model over-predicted the capillary height rise by about 20%. The model used assumes that the porous medium is either fully wet or dry, an assumption that is particularly unsuited to evaporation from the wick surface. An alternative variable-saturation model is proposed that provides a possible explanation for the 20% discrepancy reported by the authors.
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-2003
Publisher: Springer Science and Business Media LLC
Date: 21-12-2014
Publisher: Wiley
Date: 02-2015
Publisher: IEEE
Date: 02-2014
Publisher: Elsevier BV
Date: 11-2003
Publisher: American Geophysical Union (AGU)
Date: 11-2014
DOI: 10.1002/2014WR016084
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1007/BF00613584
Publisher: Informa UK Limited
Date: 05-1999
Publisher: Wiley
Date: 05-2012
DOI: 10.2136/VZJ2011.0137
Publisher: Elsevier BV
Date: 04-2007
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1007/BF00613585
Publisher: Wiley
Date: 12-2017
Publisher: Wiley
Date: 05-08-2010
DOI: 10.1002/HYP.7670
Publisher: Springer Science and Business Media LLC
Date: 20-12-2016
Publisher: American Society of Civil Engineers (ASCE)
Date: 1995
Publisher: Wiley
Date: 11-2009
DOI: 10.1002/JTR.729
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 03-2012
Publisher: International Society for Horticultural Science (ISHS)
Date: 05-2013
Publisher: Elsevier BV
Date: 07-2014
Publisher: Springer Science and Business Media LLC
Date: 16-10-2012
DOI: 10.1007/S00442-012-2495-5
Abstract: Water availability is a key determinant of the zonation patterns in estuarine vegetation, but water availability and the use of different water sources over space and time are not well understood. We have determined the seasonal water use patterns of riparian vegetation over an estuarine ecotone. Our aim was to investigate how the water use patterns of estuarine vegetation respond to variations in the availability of tidal creek water and rain-derived freshwater. The levels of natural stable isotopes of oxygen and hydrogen were assessed in the stem of the mangrove Avicennia marina (tall and scrub growth forms), Casuarina glauca and Melaleuca quinquenervia that were distributed along transects from river/creek-front towards inland habitats. The isotopic composition of plant tissues and the potential water sources were assessed in both the wet season, when freshwater from rainfall is present, and the dry season, when mangrove trees are expected to be more dependent on tidal water, and when Casuarina and Melaleuca are expected to be dependent on groundwater. Our results indicate that rainwater during the wet season contributes significantly to estuarine vegetation, even to creek-side mangroves which are inundated by tidal creek water daily, and that estuarine vegetation depends primarily on freshwater throughout the year. In contrast, high intertidal scrub mangroves were found to use the greatest proportion of tidal creek water, supplemented by groundwater in the dry season. Contrary to prediction, inland trees C. glauca and M. quinquenervia were found also to rely predominantly on rainwater--even in the dry season. The results of this study reveal a high level of complexity in vegetation water use in estuarine settings.
Publisher: Wiley
Date: 06-2017
DOI: 10.1002/HYP.11196
Publisher: Informa UK Limited
Date: 12-2009
Publisher: Elsevier BV
Date: 06-2006
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2005
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 10-2009
DOI: 10.1016/J.JCIS.2009.06.015
Abstract: The porous medium model of Green and Ampt, describing flow in porous media, appeared earlier than the capillary model of Washburn, although both lead to mathematically identical models. Here, the model of Green and Ampt was related to the Washburn model by an examination of the parameters involved in each. Fries et al. [N. Fries, M. Dreyer, J. Colloid Interface Sci. 320 (2008) 259-263] presented an explicit solution to this model. This solution is identical to the explicit solution of the Green and Ampt model presented earlier by Barry et al. [D.A. Barry, J.-Y. Parlange, G.C. Sander, M. Sivaplan, J. Hydrol. 142 (1993) 29-46].
Publisher: Wiley
Date: 18-02-2016
DOI: 10.1002/ECO.1612
Publisher: American Geophysical Union (AGU)
Date: 29-04-2022
DOI: 10.1029/2021WR031530
Abstract: Tidal wetland ecosystems are sensitive to porewater salinity dynamics. However, it is unclear how salts move and distribute in these wetlands, particularly how the salts accumulated by evaporation get removed from the wetland soil, so that the salinity levels may stabilize to accommodate vegetation. We conducted a combined field and modeling study to identify the porewater flow and salinity patterns in a subtropical wetland subjected to tidal inundation and evaporation. Measured and simulated salinity contours indicated the formation of hypersaline porewater plumes in the upper intertidal zone and the fresher porewater zones with salinity close to that of seawater near the creek and in the supratidal zone. Simulations indicated the discharge of the hypersaline upper intertidal porewater to the creek with a discharge pathway developed under the fresher near‐creek porewater zone, and this was further confirmed by the field‐observed significant salinity gradient under the creek. Our model suggested that both water and salt discharge from the wetland soil occurred predominantly at the creek bank and creek bed. The porewater discharge is more intensive through the creek bank than the creek bed, while the salt discharge across both the creek bank and creek bed was comparable due to the much higher salinity level under the creek bed. Salt discharge driven by density gradients and tidal‐induced porewater circulation provides a mechanism for removing salts accumulated in the upper intertidal zone due to evaporation and could prevent salt flat formation and marsh plants dieback.
Publisher: Springer Science and Business Media LLC
Date: 2000
Publisher: Springer Science and Business Media LLC
Date: 04-12-2018
Publisher: Elsevier BV
Date: 02-1999
Publisher: Elsevier BV
Date: 08-2000
Publisher: Wiley
Date: 03-04-2014
DOI: 10.1002/HYP.10193
Publisher: Springer Science and Business Media LLC
Date: 06-1994
DOI: 10.1007/BF00613278
Publisher: Springer Science and Business Media LLC
Date: 07-2004
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 07-2014
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 12-2008
Publisher: Wiley
Date: 21-11-2016
DOI: 10.1002/HYP.11000
Publisher: American Geophysical Union (AGU)
Date: 10-2013
DOI: 10.1002/WRCR.20487
Publisher: Springer Science and Business Media LLC
Date: 05-11-2015
Publisher: Wiley
Date: 16-05-2017
DOI: 10.1111/GCB.13722
Abstract: Coastal wetlands are known for high carbon storage within their sediments, but our understanding of the variation in carbon storage among intertidal habitats, particularly over geomorphological settings and along elevation gradients, is limited. Here, we collected 352 cores from 18 sites across Moreton Bay, Australia. We assessed variation in sediment organic carbon (OC) stocks among different geomorphological settings (wetlands within riverine settings along with those with reduced riverine influence located on tide-dominated sand islands), across elevation gradients, with distance from shore and among habitat and vegetation types. We used mid-infrared (MIR) spectroscopy combined with analytical data and partial least squares regression to quantify the carbon content of ~2500 sediment s les and provide fine-scale spatial coverage of sediment OC stocks to 150 cm depth. We found sites in river deltas had larger OC stocks (175-504 Mg/ha) than those in nonriverine settings (44-271 Mg/ha). Variation in OC stocks among nonriverine sites was high in comparison with riverine and mixed geomorphic settings, with sites closer to riverine outflow from the east and south of Moreton Bay having higher stocks than those located on the sand islands in the northwest of the bay. Sediment OC stocks increased with elevation within nonriverine settings, but not in riverine geomorphic settings. Sediment OC stocks did not differ between mangrove and saltmarsh habitats. OC stocks did, however, differ between dominant species across the research area and within geomorphic settings. At the landscape scale, the coastal wetlands of the South East Queensland catchments (17,792 ha) are comprised of approximately 4,100,000-5,200,000 Mg of sediment OC. Comparatively high variation in OC storage between riverine and nonriverine geomorphic settings indicates that the availability of mineral sediments and terrestrial derived OC may exert a strong influence over OC storage potential across intertidal wetland systems.
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2170
Publisher: Springer Science and Business Media LLC
Date: 27-06-2003
DOI: 10.1617/13791
Publisher: Wiley
Date: 30-07-2008
DOI: 10.1002/HYP.6883
Publisher: Elsevier BV
Date: 10-2005
Publisher: Elsevier
Date: 2004
Publisher: Elsevier BV
Date: 09-2009
Publisher: American Geophysical Union (AGU)
Date: 02-2015
DOI: 10.1002/2014WR015490
Publisher: Elsevier BV
Date: 06-2000
Publisher: Springer Science and Business Media LLC
Date: 15-05-2000
Publisher: American Geophysical Union (AGU)
Date: 04-2004
DOI: 10.1029/2003WR002255
Publisher: Wiley
Date: 04-12-2018
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 08-2008
Publisher: Elsevier BV
Date: 2017
Publisher: Oxford University Press (OUP)
Date: 17-03-2018
Abstract: Mangrove forests depend on a dense structure of sufficiently large trees to fulfil their essential functions as providers of food and wood for animals and people, CO2 sinks and protection from storms. Growth of these forests is known to be dependent on the salinity of soil water, but the influence of foliar uptake of rainwater as a freshwater source, additional to soil water, has hardly been investigated. Under field conditions in Australia, stem diameter variation, sap flow and stem water potential of the grey mangrove (Avicennia marina (Forssk.) Vierh.) were simultaneously measured during alternating dry and rainy periods. We found that sap flow in A. marina was reversed, from canopy to roots, during and shortly after rainfall events. Simultaneously, stem diameters rapidly increased with growth rates up to 70 μm h-1, which is about 25-75 times the normal growth rate reported in temperate trees. A mechanistic tree model was applied to provide evidence that A. marina trees take up water through their leaves, and that this water contributes to turgor-driven stem growth. Our results indicate that direct uptake of freshwater by the canopy during rainfall supports mangrove tree growth and serve as a call to consider this water uptake pathway if we aspire to correctly assess influences of changing rainfall patterns on mangrove tree growth.
Publisher: American Geophysical Union (AGU)
Date: 05-2013
DOI: 10.1002/WRCR.20237
Publisher: Elsevier BV
Date: 12-2008
Publisher: American Geophysical Union (AGU)
Date: 06-2005
DOI: 10.1029/2004WR003759
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2005
Publisher: Elsevier BV
Date: 04-2007
Publisher: American Geophysical Union (AGU)
Date: 09-2011
DOI: 10.1029/2010WR010298
Publisher: Wiley
Date: 2007
DOI: 10.1002/HYP.6256
Publisher: Springer Science and Business Media LLC
Date: 13-09-2006
Publisher: American Geophysical Union (AGU)
Date: 02-2016
DOI: 10.1002/2015WR017420
Publisher: Wiley
Date: 25-04-2011
DOI: 10.1002/HYP.8079
Publisher: Elsevier BV
Date: 02-2003
Publisher: Elsevier BV
Date: 08-2000
Publisher: Elsevier BV
Date: 08-2015
Publisher: Informa UK Limited
Date: 2000
Publisher: Springer Science and Business Media LLC
Date: 30-10-2014
Publisher: Oxford University Press (OUP)
Date: 17-01-2013
Abstract: Estimating sapwood area is one of the main sources of error when upscaling point scale sap flow measurements to whole-tree water use. In this study, the potential use of electrical resistivity tomography (ERT) to determine the sapwood-heartwood (SW-HW) boundary is investigated for Pinus elliottii Engelm var. elliottii × Pinus caribaea Morelet var. hondurensis growing in a subtropical climate. Specifically, this study investigates: (i) how electrical resistivity is correlated to either wood moisture content, or electrolyte concentration, or both, and (ii) how the SW-HW boundary is defined in terms of electrical resistivity. Tree cross-sections at breast height are analysed using ERT before being felled and the cross-section surface s led for analysis of major electrolyte concentrations, wood moisture content and density. Electrical resistivity tomography results show patterns with high resistivities occurring in the inner part of the cross-section, with much lower values towards the outside. The high-resistivity areas were generally smaller than the low-resistivity areas. A comparison between ERT and actual SW area measured after felling shows a slope of the linear regression close to unity (=0.96) with a large spread of values (R(2) = 0.56) mostly due to uncertainties in ERT. Electrolyte concentrations along s led radial transects (cardinal directions) generally showed no trend from the centre of the tree to the bark. Wood moisture content and density show comparable trends that could explain the resistivity patterns. While this study indicates the potential for application of ERT for estimating SW area, it shows that there remains a need for refinement in locating the SW-HW boundary (e.g., by improvement of the inversion method, or perhaps electrode density) in order to increase the robustness of the method.
Publisher: American Geophysical Union (AGU)
Date: 10-2014
DOI: 10.1002/2013WR015127
Publisher: Elsevier BV
Date: 07-2005
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2012
No related organisations have been discovered for David Lockington.
Start Date: 2007
End Date: 12-2009
Amount: $120,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2004
End Date: 03-2008
Amount: $70,668.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2004
End Date: 12-2008
Amount: $108,268.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2009
End Date: 12-2013
Amount: $290,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2016
End Date: 12-2019
Amount: $233,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2004
End Date: 06-2004
Amount: $10,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2004
End Date: 12-2004
Amount: $10,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 01-2018
End Date: 12-2022
Amount: $446,340.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2009
End Date: 12-2015
Amount: $14,999,996.00
Funder: Australian Research Council
View Funded Activity