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Use of remote sensing actual evapotranspiration estimates and water delivery data for assessing water use efficiency in an irrigated landscape. Improving management of water in irrigated agriculture will lead to increased sustainability, decreased environmental impacts and increased profitability. Quantifying water use efficiency for an irrigation district is a vital part of improving water management. This project aims to develop new methods for quantifying water use efficiency by combining ac ....Use of remote sensing actual evapotranspiration estimates and water delivery data for assessing water use efficiency in an irrigated landscape. Improving management of water in irrigated agriculture will lead to increased sustainability, decreased environmental impacts and increased profitability. Quantifying water use efficiency for an irrigation district is a vital part of improving water management. This project aims to develop new methods for quantifying water use efficiency by combining actual evapotranspiration estimates with water delivery information at the farm scale for an entire irrigation district. Remote sensing techniques will be utilized to map actual evapotranspiration and water meter data will be combined with cadastral and channel network data to map water delivery.Read moreRead less
Risk Assessment of Pesticide Contamination of Surface Water and Groundwater - Trigger Mechanisms for Fast Transport. Pesticide and herbicide transport to groundwater and surface water poses a risk to the environment and humans alike. A new event-based risk assessment approach of pesticide movement to surface water and groundwater will be developed. With the use of rainfall simulation partitioning between surface runoff and infiltration will be quantified in an agricultural catchment. Pesticide c ....Risk Assessment of Pesticide Contamination of Surface Water and Groundwater - Trigger Mechanisms for Fast Transport. Pesticide and herbicide transport to groundwater and surface water poses a risk to the environment and humans alike. A new event-based risk assessment approach of pesticide movement to surface water and groundwater will be developed. With the use of rainfall simulation partitioning between surface runoff and infiltration will be quantified in an agricultural catchment. Pesticide contamination events will be identified from climatic data such high intensity rainfalls and soil properties controlling runoff and preferential flow. Results will be used to develop management strategies to reduce offsite movement of pesticides.Read moreRead less
Developing a decision support system for the management of road runoff for water quality protection. Multiple stakeholders share a vested and often significant financial commitment to ensure water quality standards. These industries, in turn, are vital to the social and economic sustainability of many rural communities in Australia. Recent climatic trends of increasing drought episodes and related natural disasters such as bushfires are expected to increase the delivery of sediments and associat ....Developing a decision support system for the management of road runoff for water quality protection. Multiple stakeholders share a vested and often significant financial commitment to ensure water quality standards. These industries, in turn, are vital to the social and economic sustainability of many rural communities in Australia. Recent climatic trends of increasing drought episodes and related natural disasters such as bushfires are expected to increase the delivery of sediments and associated pollutants to streams. The proposed DSS will allow testing of various management scenarios with respect to road position and layout, thereby providing a planning and management tool, and a method to educate the practitioners involved in environmental management in Australia. Read moreRead less
A Generalized Flood Frequency Framework for Prediction of the Effects of Multi-Scale Hydroclimatic Variability. The proposed project aims to investigate the effects of natural, multi-scale variability in climatic inputs, especially precipitation inputs -- intra-annual (seasonal), inter-annual and inter-decadal -- on the estimation of frequency of flooding. It will investigate the propagation of these natural variabilities through the catchment system, through simple models that can enable the e ....A Generalized Flood Frequency Framework for Prediction of the Effects of Multi-Scale Hydroclimatic Variability. The proposed project aims to investigate the effects of natural, multi-scale variability in climatic inputs, especially precipitation inputs -- intra-annual (seasonal), inter-annual and inter-decadal -- on the estimation of frequency of flooding. It will investigate the propagation of these natural variabilities through the catchment system, through simple models that can enable the estimation of probability distributions of soil moisture, runoff generation and flood peaks, and elucidate the underlying process controls. In this way, it will help develop a new framework for the incorporation of these multi-scale variabilities in flood estimation practice in Australia.Read moreRead less
Plutonium - A new tracer of sediment transport into the Great Barrier Reef Lagoon. This work will quantify one of the most controversial threats to the Great Barrier Reef Marine Park, namely the amount of sediment reaching the reef as a consequence of human activities. It will have economic implications for this major Australian tourist attraction, as well as the commercial fishing and agricultural and horticultural industries in the region. The direct economic value associated with these indust ....Plutonium - A new tracer of sediment transport into the Great Barrier Reef Lagoon. This work will quantify one of the most controversial threats to the Great Barrier Reef Marine Park, namely the amount of sediment reaching the reef as a consequence of human activities. It will have economic implications for this major Australian tourist attraction, as well as the commercial fishing and agricultural and horticultural industries in the region. The direct economic value associated with these industries exceeds $1 billion per annum, and around 1 million people visit the inshore areas every year. Management of the park will benefit through improved understanding of the transport of sediment from the rivers to the lagoon and inner reef areas, and the fraction of the sediment attributable to anthropogenic practices. Read moreRead less
Airborne electromagnetic estimation of groundwater quality and distribution in the top 100m of the earth. This research will develop processing methodology to predict groundwater concentration and quality in the top 100m of the earth, using continuously sampled airborne electromagnetic data. The method to be developed will process received responses to separate and identify propagation delays, distinct from the usual diffusive delays caused by shallow conductive materials. The extracted propagat ....Airborne electromagnetic estimation of groundwater quality and distribution in the top 100m of the earth. This research will develop processing methodology to predict groundwater concentration and quality in the top 100m of the earth, using continuously sampled airborne electromagnetic data. The method to be developed will process received responses to separate and identify propagation delays, distinct from the usual diffusive delays caused by shallow conductive materials. The extracted propagation delays then predict ground moisture content. With proposed changes to transmitter hardware, we can also achieve improved shallow resolution of conductive structures, such as shallow saline groundwater layers. However, the new method will pioneer the remote detection of fresh waters.Read moreRead less
Integrating dynamic and optimization models for efficient pipeline system operations in an evolving water and energy market. Developing an integrated dynamical and optimisation model for a piped water distribution system will advance Australia's capacity to deploy the most recent optimisation approaches to achieve the high level of efficiency required in the delivery of water to dryland regions. The outcomes of this project will be readily transferable to other regions and indeed other water d ....Integrating dynamic and optimization models for efficient pipeline system operations in an evolving water and energy market. Developing an integrated dynamical and optimisation model for a piped water distribution system will advance Australia's capacity to deploy the most recent optimisation approaches to achieve the high level of efficiency required in the delivery of water to dryland regions. The outcomes of this project will be readily transferable to other regions and indeed other water distribution systems. This will provide capability in securing Australia's water supplies and delivery systems. There may also be associated benefits to other pipeline operators in the oil and gas industries.Read moreRead less
Riparian rehabilitation and ecohydraulics: interactions between flow, sediment, vegetation and bank erosion in longstem tubestock rehabilitation works. Riparian lands are important for maintaining viable ecosystems, improving water quality and reducing sediment yields in rivers and streams. Research in Australia has shown that streambank erosion is the most significant processes in the continuing physical and ecological degradation of riparian zones. The recently developed longstem tubestock sys ....Riparian rehabilitation and ecohydraulics: interactions between flow, sediment, vegetation and bank erosion in longstem tubestock rehabilitation works. Riparian lands are important for maintaining viable ecosystems, improving water quality and reducing sediment yields in rivers and streams. Research in Australia has shown that streambank erosion is the most significant processes in the continuing physical and ecological degradation of riparian zones. The recently developed longstem tubestock system has shown promise in controlling streambank erosion using native vegetation. However, rehabilitation practices rely on ad-hoc recipes without a thorough scientific understanding of near-bank processes. This research will fill this gap by combining field and laboratory experiments on tubestock plantings in order to develop guidelines and predictive tools for riparian zone management.Read moreRead less
Hydraulic Properties of Swelling Clay-Gel Soils: Electrolyte and Temperature Effects. We seek to understand the impacts of electrolytes and temperature on the equilibrium and water flow properties of swelling, clay-gel soils. These soils are important in cropping, the environment and industrial processes. Their hydraulic properties govern dewatering rates, rheology, and solute movement. Double layer theory (DLVO) successfully describes the equilibrium behaviour of model, parallel-plate clay syst ....Hydraulic Properties of Swelling Clay-Gel Soils: Electrolyte and Temperature Effects. We seek to understand the impacts of electrolytes and temperature on the equilibrium and water flow properties of swelling, clay-gel soils. These soils are important in cropping, the environment and industrial processes. Their hydraulic properties govern dewatering rates, rheology, and solute movement. Double layer theory (DLVO) successfully describes the equilibrium behaviour of model, parallel-plate clay systems in laboratories. However, equilibrium and water transport properties of less-ideal, clay slurries are poorly described by theory. Field clay-gels are therefore problematic. Outcomes will be better understanding of swelling clays, improved and more cost effective management techniques for gel soils and trained graduates.Read moreRead less
A Stochastic Downscaling Framework for Catchment Scale Climate Change Impact Assessment. We propose a framework for climate change impact assessment at the catchment scale, that can both assess the change in catchment yield, as well as refine management policies to mitigate likely impacts. A key aim is to represent the full uncertainty in the simulated streamflow, thus enabling a risk-based comparison of current policies with those for climate change conditions. Given the importance of this rese ....A Stochastic Downscaling Framework for Catchment Scale Climate Change Impact Assessment. We propose a framework for climate change impact assessment at the catchment scale, that can both assess the change in catchment yield, as well as refine management policies to mitigate likely impacts. A key aim is to represent the full uncertainty in the simulated streamflow, thus enabling a risk-based comparison of current policies with those for climate change conditions. Given the importance of this research to the availability of water under a climate change scenario, this proposal has been listed under the ARC's Research Priority 1: 'An Environmentally Sustainable Australia', with the specific priority goals being 'Water - A Critical Resource', and 'Responding to climate change and variability'.Read moreRead less