PREDICTING THE CLOGGING OF STORM WATER INFILTRATION SYSTEMS. Infiltration systems are widely used in sustainable management of stormwater in both urban and rural areas. They are also an integral part of large stormwater-harvesting facilities. However, they tend to fail due to clogging (infiltration medium gets filled by silt from runoff), and this phenomenon is far from being understood. The aim of this project is to develop a new prediction method of clogging of stormwater infiltration systems. ....PREDICTING THE CLOGGING OF STORM WATER INFILTRATION SYSTEMS. Infiltration systems are widely used in sustainable management of stormwater in both urban and rural areas. They are also an integral part of large stormwater-harvesting facilities. However, they tend to fail due to clogging (infiltration medium gets filled by silt from runoff), and this phenomenon is far from being understood. The aim of this project is to develop a new prediction method of clogging of stormwater infiltration systems. Extensive 1D and 2D laboratory experimental programmes will be carried out. Models of unit processes that occur in infiltration systems will be defined/developed and built into a physically based model of an infiltration system. This model could be used for reliable design of stormwater drainage and harvesting systems, bringing major benefits to the people of drier and more populated areas of Australia.Read moreRead less
Optimum aeration strategies for shallow tidally flushed lakes. Shallow tidally flushed lakes frequently suffer from water quality problems which include catastrophic fish kills. Frequently these events are related to the response of a highly modified system to a natural event. One event is the change from a saline to a fresh environment with seasonal freshwater inflow, in which case the salt tolerant algal species dies. The balance between photosynthesis, sediment uptake, surface oxygen transfer ....Optimum aeration strategies for shallow tidally flushed lakes. Shallow tidally flushed lakes frequently suffer from water quality problems which include catastrophic fish kills. Frequently these events are related to the response of a highly modified system to a natural event. One event is the change from a saline to a fresh environment with seasonal freshwater inflow, in which case the salt tolerant algal species dies. The balance between photosynthesis, sediment uptake, surface oxygen transfer and flushing is lost, with the result that the lake quickly becomes anoxic, resulting in fish kills. This project examines some aeration solutions to this problem.Read moreRead less
Dynamic Release Mechanisms for Phosphorus in Shallow Ponds and Lakes. Phosphorus release from submerged sediments is controlled by the physical and chemical environment. The mechanisms are well understood where thermal stratification is persistent but the behaviour during transient episodes has not been properly addressed. The aim is to study a dynamic chemical and hydraulic environment and develop a model of phosphorus release under these conditions. Algal blooms, which rely on high nutrient co ....Dynamic Release Mechanisms for Phosphorus in Shallow Ponds and Lakes. Phosphorus release from submerged sediments is controlled by the physical and chemical environment. The mechanisms are well understood where thermal stratification is persistent but the behaviour during transient episodes has not been properly addressed. The aim is to study a dynamic chemical and hydraulic environment and develop a model of phosphorus release under these conditions. Algal blooms, which rely on high nutrient concentrations, pose a significant threat to waterways yet a process-based description of phosphorus release is not yet possible. The outcome will be a verified model of phosphorus release mechanisms suitable for a range of water bodies.Read moreRead less
SCANEM : A Scanning and Inspection Method for Urban Pipeline Systems. Water and sewage utilities are crucial factors limiting economic growth and urban amenity. However many of these facilities are subject to corrosion, fracture and collapse and new strategies are now required to provide a sound basis for systematic remediation and replacement. Suitable strategies involving a structural audit and statistical analysis have been proposed by CSIRO and Tyco Water. However new geophysical inspection ....SCANEM : A Scanning and Inspection Method for Urban Pipeline Systems. Water and sewage utilities are crucial factors limiting economic growth and urban amenity. However many of these facilities are subject to corrosion, fracture and collapse and new strategies are now required to provide a sound basis for systematic remediation and replacement. Suitable strategies involving a structural audit and statistical analysis have been proposed by CSIRO and Tyco Water. However new geophysical inspection methods are now required to provide the key physical parameters relating to pipeline condition. Hopefully the EM inspection tool resulting from this project will provide the industrial partners with a unique capacity to satisfy a major global market.Read moreRead less
Development of an adaptive statistical model for oceanic flooding hazards along the East Australian coast. Planning of invaluable coastal infrastructure and housing is critical to the economic and social well-being of Australian communities. Devastating flooding along coasts and estuaries in Australia frequently occurred before 1980, but has been less common since. However, the risks are clear and enormous as demonstrated in recent disasters like Hurricane Katrina and the 2004 Boxing Day tsunami ....Development of an adaptive statistical model for oceanic flooding hazards along the East Australian coast. Planning of invaluable coastal infrastructure and housing is critical to the economic and social well-being of Australian communities. Devastating flooding along coasts and estuaries in Australia frequently occurred before 1980, but has been less common since. However, the risks are clear and enormous as demonstrated in recent disasters like Hurricane Katrina and the 2004 Boxing Day tsunami. Climate change makes flood predictions even more difficult. This project will develop a new adaptive model which accounts for both the present and future climate and also regional variability. The research will be in collaboration with the NSW Dept of Climate Change to enable rapid government action to improve community trust in flood protection. Read moreRead less
Hydraulic durability of geosynthetic clay liners in steep slope sealing systems for landfills constructed in former quarries. Old quarries are increasingly used for the construction of landfills. The engineering challenge in constructing such landfills includes developing an appropriate lining system for the often steep sided quarry walls. The use of GCLs as part of the lining system can be a viable and a cost effective solution. However, this solution suffers from the lack of meaningful data on ....Hydraulic durability of geosynthetic clay liners in steep slope sealing systems for landfills constructed in former quarries. Old quarries are increasingly used for the construction of landfills. The engineering challenge in constructing such landfills includes developing an appropriate lining system for the often steep sided quarry walls. The use of GCLs as part of the lining system can be a viable and a cost effective solution. However, this solution suffers from the lack of meaningful data on their hydraulic durability in this particular situation. This proposal presents an original approach to investigate this durability under operating conditions typically encountered in steep sided quarries. This work is expected to provide benefits to waste containment efforts at national and international level.Read moreRead less
Settlement of municipal solid waste. The mechanisms governing municipal solid waste settlement are many and complex. There is a clear need to adopt a methodology to forecast the landfilling space based on high quality full scale data where composition, method of placement, compactive effort employed during placement of the waste, thickness of daily cover, stage filling and local moisture content are all recorded. This is the only sound scientific way forward to develop a predictive model that ....Settlement of municipal solid waste. The mechanisms governing municipal solid waste settlement are many and complex. There is a clear need to adopt a methodology to forecast the landfilling space based on high quality full scale data where composition, method of placement, compactive effort employed during placement of the waste, thickness of daily cover, stage filling and local moisture content are all recorded. This is the only sound scientific way forward to develop a predictive model that links settlement to these parameters. This project will contribute to developing such a methodology for the benefit of the Australian waste containment industry.Read moreRead less
Research and development of devices to improve the quality of stormwater by removal of gross pollutants such as soil, litter and sediment. Oil,litter and sediment are serious pollutants in stormwater which go hand in hand with human and industrial activity. An outcome of this research will be to develop a device capable of removing such gross pollutants from stormwater at higher efficiencies than that currently commercially available. Vital wetland resources such as Moreton Bay near Brisbane, a ....Research and development of devices to improve the quality of stormwater by removal of gross pollutants such as soil, litter and sediment. Oil,litter and sediment are serious pollutants in stormwater which go hand in hand with human and industrial activity. An outcome of this research will be to develop a device capable of removing such gross pollutants from stormwater at higher efficiencies than that currently commercially available. Vital wetland resources such as Moreton Bay near Brisbane, a wetland of international significance that contributes around $400 million to the local economy,are under threat from polluted stormwater. Similar problems are occuring right around the entire coast of Australia and also in some inland waterways.Read moreRead less
Flow generated by ducted surface pumps: buoyant jets at high Reynolds numbers and low Froude numbers. Ducted surface pumps are used in reservoirs to circulate and destratify the water in order to maintain its general quality and reduce the incidence of toxic algal blooms. This project aims to improve our understanding of the circulation and mixing behaviour of the large, low velocity jets, plumes and fountains created by these pumps. Computational fluid dynamics, laboratory and field studies wil ....Flow generated by ducted surface pumps: buoyant jets at high Reynolds numbers and low Froude numbers. Ducted surface pumps are used in reservoirs to circulate and destratify the water in order to maintain its general quality and reduce the incidence of toxic algal blooms. This project aims to improve our understanding of the circulation and mixing behaviour of the large, low velocity jets, plumes and fountains created by these pumps. Computational fluid dynamics, laboratory and field studies will be used to model and map these flow fields. The findings will have a number of potential applications including methods for improving water quality in and downstream of storages.Read moreRead less
Managing Fresh-Water Resources in Saline Environments. Australian industry and urban developments often rely on a secure supply of fresh water. In many situations, the fresh water occurs adjacent to large expanses of saline water. This poses special constraints on how the fresh water can be recovered. This project undertakes careful mathematical modelling of fresh water recovery from reservoirs and from within islands (where it may be the only practical source of drinking water). The injecti ....Managing Fresh-Water Resources in Saline Environments. Australian industry and urban developments often rely on a secure supply of fresh water. In many situations, the fresh water occurs adjacent to large expanses of saline water. This poses special constraints on how the fresh water can be recovered. This project undertakes careful mathematical modelling of fresh water recovery from reservoirs and from within islands (where it may be the only practical source of drinking water). The injection and extraction of ground water in novel "mineral leaching" mining technology will also be investigated.Read moreRead less