ORCID Profile
0000-0002-0384-8221
Current Organisation
UNSW Sydney
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Civil Engineering | Geotechnical Engineering | Environmental Technologies | Soil And Water Sciences Not Elsewhere Classified | Environmental Engineering Not Elsewhere Classified | Civil Engineering Not Elsewhere Classified
Land and water management | Rehabilitation of degraded coastal and estuarine areas | Land and water management |
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 10-2015
Publisher: Geological Society of London
Date: 05-2005
Publisher: Springer Science and Business Media LLC
Date: 2002
Publisher: Elsevier BV
Date: 06-2022
DOI: 10.1016/J.WATRES.2022.118445
Abstract: Eutrophication due to excess anthropogenic nutrients in waterways is a significant issue worldwide. The pressure-stressor-response of a waterway to excessive nutrient loading is reliant on numerous physical and biological factors, including hydrodynamics and microbial processing. While substantial progress has been made towards simulating these mechanisms there are limited multi-disciplinary studies that relate the physical hydrodynamics of a site with the ecological response from linked laboratory and field studies. This paper presents the development of a coupled hydrodynamic and aquatic ecosystem response model, expanded to include an integrated microbial loop, that allows the explicit representation of heterotrophic bacteria growth and dissolved organic nutrient mineralisation. A unique long-term water quality dataset at an estuary in south-eastern Australia was used to validate and assess the model's sensitivity to complex biophysical processes driving the observed water quality variability. Results indicate that explicit time-varying bacterial mineralisation rates provide a substantially improved understanding of the broader aquatic ecosystem response than assigned fixed bulk rate parameter values, which are typically derived from non-local literature. Implementation of a microbial loop at the study site indicated that the model is sensitive to the boundary conditions, in particular catchment loads, with both net transport rates and the net growth rates of heterotrophic bacteria demonstrating different responses. Under average flow conditions, a smaller net transport and reduced nutrient availability has a pronounced effect of lowering net growth rates through the applied limitation factors. During high flow conditions, freshwater inflows increased net transport and nutrient loads, which resulted in higher net growth rates. Further, temporal variability in water temperature had a compounding effect on the model's response sensitivity. This approach has broader application in other riverine systems subject to eutrophication, and in interrogating linkages in hydrodynamic and microbial mediated processes (e.g., productivity). Future studies are recommended to better understand the sensitivity of aquatic ecosystem response models to microbial net growth rate kinetics at different temperatures and from top-down predation (e.g., zooplankton grazing).
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 2018
Publisher: American Geophysical Union (AGU)
Date: 08-2021
DOI: 10.1029/2020WR028918
Abstract: Constructed shallow waterbodies are often designed and built to limit harmful algal blooms in urban regions. Efforts to reduce algal bloom occurrence in these waterbodies have largely focused on waterbody design, catchment criteria and onsite engineering options. However, many constructed shallow waterbodies that comply with design guidelines still experience harmful algal blooms. Identifying the knowledge gaps in current guidelines and examining their recommended design criteria can improve their effectiveness to reduce algal outbreaks. Here, we reviewed 66 global guidelines and identified common design criteria. The use of a ‘one size fits all' empirical approach and dated literature are common issues associated with the design criteria recommended. Further, only approximately one third of the guidelines that were analyzed directly mentioned harmful algal bloom‐related design criteria. To test the validity of these design values in a real‐world setting, the suitability of design factors in limiting harmful algal blooms was assessed by analyzing 222 shallow waterbodies monitored over a 9 year period in southeastern Australia. The site analysis indicated that macrophyte area to surface area ratio, shoreline development index, and fetch are the three most influential single design factors associated with harmful algal bloom reduction. The analyses highlighted the ineffectiveness of the existing design criteria globally, with blooms occurring even though some waterbodies were designed in accordance with recommended parameters. The analysis suggested that understanding interactions between multiple design factors may be a useful approach, for ex le, when considering the macrophyte area to surface area ratio in combination with the shoreline development index.
Publisher: Informa UK Limited
Date: 02-2009
Publisher: Island Press/Center for Resource Economics
Date: 2012
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 08-2114
Publisher: Informa UK Limited
Date: 02-2009
Publisher: Wiley
Date: 24-11-2021
Publisher: Elsevier BV
Date: 10-2019
Publisher: Wiley
Date: 20-05-2022
Publisher: Elsevier BV
Date: 12-2018
Publisher: American Geophysical Union (AGU)
Date: 31-08-2023
DOI: 10.1029/2023WR035026
Abstract: Hypoxic blackwater events occur worldwide, affecting inland and coastal waters. These events have been exacerbated by man‐made floodplain drainage, leading to large‐scale fish kills and ecological degradation. This paper presents a new method to identify estuarine catchment areas that are most likely to generate hypoxic conditions. The method uses established risk factors, including vegetation type, inundation extent and duration, ground‐truthed in eastern Australia. A catchment is at higher risk of hypoxic blackwater generation if (a) it is located where floodwaters are high and/or drainage is impeded, (b) the site topography includes an extensive, low‐lying floodplain and/or (c) the land‐use and environmental characteristics have a high deoxygenation potential. Consequent impacts to an estuary are determined by the floodplain connectivity with the estuary, and the discharge characteristics of the catchment drainage system. Where multiple, proximate catchments have similar drainage conditions, compounding plumes of hypoxic blackwater can overwhelm the assimilation capacity of the estuary. Climate change may significantly increase the volume and frequency of blackwater events in estuarine environments as a result of reduced drainage due to sea level rise, higher temperatures, and more intense and sporadic rainfall events. It is recommended that management measures be introduced to mitigate the effects of climate change and avoid further widespread hypoxic blackwater events.
Publisher: American Geophysical Union (AGU)
Date: 10-2021
DOI: 10.1029/2020WR029310
Abstract: Wetlands are an important habitat for many species but over the past few decades ecosystem bio ersity and function have been threatened. Due to their shallow and fluctuating water levels, wetlands are particularly vulnerable to climate variability. This is especially a risk for ephemeral and intermittent wetlands with limited hydrologic connections to deep aquifers, designated herein as Climate‐induced Intermittent Wetlands (CiIWs). However, the response of CiIW systems to long‐term climate variability has received limited research attention, partly because continuous ground surface monitoring data is rarely available over inter‐decadal periods. An alternative to ground surface data is the use of satellite imagery to estimate the temporal water extent variability. An integrated remote sensing and modeling approach is presented here to provide a novel method for investigating historical water storage variations in a CiIW system. The new method estimates water levels in a shallow wetland using Landsat data and was successfully validated against field water level data. The new method performed better than five existing algorithms. A water balance model was calibrated using the combined remotely sensed and local field data to derive daily water level time series since 1900. The validated water balance model results indicated that most of the water level fluctuations in the intermittent wetland can be explained by climatic drivers and subsurface flow interactions. Overall, this study demonstrates the importance of an integrated remote sensing and water balance modeling approach for hydroclimatic analysis of intermittent wetlands.
Publisher: Authorea, Inc.
Date: 16-04-2023
DOI: 10.22541/ESSOAR.168167360.03118440/V1
Abstract: Hypoxic blackwater events occur worldwide, affecting inland and coastal waters. These events have been exacerbated by man-made floodplain drainage, leading to large-scale fish kills and ecological degradation. This paper presents a new method to identify estuarine catchment areas that are most likely to generate hypoxic conditions. The method uses established blackwater risk factors, including vegetation type, inundation extent and duration, ground-truthed in eastern Australia. A catchment is at higher risk of blackwater generation if (i) it is located where floodwaters are high and/or drainage is impeded, (ii) the site topography includes an extensive, low-lying floodplain and/or (iii) the land-use and environmental characteristics have a high deoxygenation potential. Blackwater impacts in an estuary are determined by the floodplain connectivity with the estuary, and the discharge characteristics of the catchment drainage system. Where multiple, proximate catchments have similar drainage conditions, compounding blackwater plumes can overwhelm the assimilation capacity of the estuary. Climate change may significantly increase the volume and frequency of blackwater events in estuarine environments as a result of reduced drainage due to sea level rise, higher temperatures, and more intense and sporadic rainfall events. It is recommended that management measures be introduced to mitigate the effects of climate change and avoid further widespread hypoxic blackwater events.
Publisher: Wiley
Date: 17-03-2021
Publisher: American Geophysical Union (AGU)
Date: 06-2022
DOI: 10.1029/2021WR031405
Abstract: Much of the development of the low elevation coastal zone has involved the reclamation of low‐lying floodplains and wetlands through the construction of flood mitigation and drainage systems. These systems function throughout the tidal range, protecting from high tides while draining excess catchment flows to the low tide. However, drainage can only be achieved under gravity when water levels in the catchment drains are higher than those in the estuary. Changes to the tidal range and to the duration of the rising and falling tides that occur throughout estuarine waters will result in dynamic variations in the window of opportunity for gravity discharge within and between different catchments and under sea level rise (SLR). Existing concerns regarding SLR impacts have focused on the acute effects of higher water levels, but SLR will affect the full tidal range, and drainage systems will be particularly vulnerable to changes in the low tide. This study introduces the concept of the drainage window to address this limitation by assessing how the present‐day and future SLR tidal regimes may influence the drainage of different estuarine floodplains. Applying the drainage window to two different estuaries indicated that SLR may substantially reduce the opportunity for discharging many estuarine floodplain drainage systems. Reduced drainage creates a host of chronic problems that may necessitate changes to existing land uses. A holistic assessment of future changes to all water levels (including low tide levels and extended flood recession periods) is required to inform strategic land use planning and estuarine management.
Start Date: 03-2010
End Date: 03-2014
Amount: $310,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2004
End Date: 12-2004
Amount: $10,000.00
Funder: Australian Research Council
View Funded Activity