A5056083828- Atmospheric and Environmental Gas Dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Hydrology and Watershed Management Studies
- Marine and coastal ecosystems
- Aquatic Invertebrate Ecology and Behavior
- Soil and Water Nutrient Dynamics
- Water Quality and Pollution Assessment
- Reservoir Engineering and Simulation Methods
- Constructed Wetlands for Wastewater Treatment
- Water-Energy-Food Nexus Studies
- Groundwater and Watershed Analysis
- Climate change and permafrost
- Marine and fisheries research
- Hydrology and Sediment Transport Processes
- Solar-Powered Water Purification Methods
- Soil erosion and sediment transport
- Plant Water Relations and Carbon Dynamics
- Atmospheric chemistry and aerosols
- Environmental remediation with nanomaterials
- Biocrusts and Microbial Ecology
- Layered Double Hydroxides Synthesis and Applications
- Sustainable Agricultural Systems Analysis
- Aquatic Ecosystems and Biodiversity
- Peatlands and Wetlands Ecology
CSIRO Land and Water
2000-2022
University of Canberra
2017
ACT Government
2011-2015
Commonwealth Scientific and Industrial Research Organisation
1992-2013
James Cook University
2009
Nova Southeastern University
1999
The University of Western Australia
1988-1991
We explore the role of lakes in carbon cycling and global climate, examine mechanisms influencing pools transformations lakes, discuss how metabolism inland waters is likely to change response climate. Furthermore, we project changes as climate abundance spatial distribution biosphere, revise estimate for extent transformation waters. This synthesis demonstrates that annual emissions dioxide from atmosphere are similar magnitude uptake by oceans burial organic water sediments exceeds...
Abstract. This paper reports a study of the full carbon (C-CO2) budget Australian continent, focussing on 1990–2011 in context estimates over two centuries. The work is contribution to RECCAP (REgional Carbon Cycle Assessment and Processes) project, as one numerous regional studies. In constructing budget, we estimate following component fluxes: net primary production (NPP); ecosystem (NEP); fire; land use change (LUC); riverine export; dust harvest (wood, crop livestock) fossil fuel...
Key Points Brune and Churchill curves poorly predict reservoir trapping in tropical rivers A modification to the curve shows promise better The partitioning of particle size fractions through reservoirs are highlighted
The transitions between the diatoms Aulacoseira spp. ( Melosira ) and cyanobacteria Anabaena as dominant phytoplankton species in a turbid‐river weir pool are shown to depend directly on establishment or destruction of persistent thermal stratification. A transition from high low flow through resulted stratification, causing sink out euphotic zone at speed 0.95 m d −1 . Concurrently, slightly buoyant grew within with specific growth rate 0.37 , climaxing after approximately 14 population...
Abstract. Emissions from flooded land represent a direct source of anthropogenic greenhouse gas (GHG) emissions. Methane emissions large, artificial water bodies have previously been considered, with numerous studies assessing emission rates and relatively simple procedures available to determine their surface area generate upscaled estimates. In contrast, the role small (ponds) is very poorly quantified, estimation constrained both by lack data on spatial extent scarcity flux measurements....
Abstract A one‐dimensional hydrodynamic reservoir model is coupled with a stochastic fish population to examine the impacts of cold water pollution (CWP) on Australian freshwater fish, Murray cod, downstream Hume Dam, Australia. Mitigation CWP through introduction selective withdrawal capabilities access near‐surface predicted increase discharge temperatures during crucial spring‐early summer post‐spawning period by 4–6°C for normal operating conditions, that is, full in early spring. No...
Greenhouse gas emissions are likely to rise faster than growth in population and more double for water supply wastewater services over the next 50 years South East Queensland (SEQ), Australia. New sources of such as rainwater tanks, recycled water, desalination currently have greater energy intensity traditional sources. In addition, direct greenhouse from reservoirs treatment handling potentially same magnitude use energy. Centralized decentralized systems considered a scenario based upon...
A reservoir with distinct shallow and deep regions can produce stratification in response to uniform surface heat loss. The region cools more rapidly, a cold dense gravity current forms that results at the base of an upwelling water. mixed layer deepens by convective entrainment, steady mixed‐layer depth result when balances rate which deepens. depends on ratio area region. Significant only has account for than 50% area. also depths regions, no significant form if this is greater 0.5. For...
Fogg and Walsby’s (1971) hypothesis that buoyancy regulation in cyanobacteria might be an adaptation to exploit the separation of light nutrients has since become a paradigm. The evidence its veracity is examined within observations algal abundance chlorophyll distributions several Australian freshwater systems also reviewed from literature. It clear both laboratory experiments field measurements filamentous genera such as Anabaena colony-forming Microcystis are capable changing their...
The incidence of blooms the toxic cyanobacterium Anabaena circinalis in major rivers Murray–Darling Basin has been strongly related to river discharge, because they are more prevalent during times low flows. This study into causes cyanobacterial Maude Weir pool on Murrumbidgee River demonstrates that for form, water column needs be persistently stratified, a condition occurs only discharge. Based relationship between stratification, and bloom formation, four strategies might implemented...
Abstract Fluxes of carbon dioxide (CO 2 ) and methane (CH 4 from hydroelectric water supply reservoirs are receiving increasing attention around the world with a number research groups having undertaken measurements these emissions across range lakes located in different climates landscapes. The use floating chambers (aka flux chambers) is most common technique for direct measurement fluxes. However, relative performance systems, especially chamber designs, not well documented. We report...
Small concrete artificial reef modules (hemisphere-shaped, approximately 1.3 m diameter, 1 high) were placed at two sites, eight per site. The sites in 7 and 21 of water, 1.6 km apart, off the coast southeast Florida, USA. reefs censused monthly for fish over a 19-month period. Species, number fish, estimated total length each individual recorded by divers using SCUBA. After census, all removed from with piscicide. A 88 species study, significantly greater diversity on deep (monthly mean 7.6...
A method to simulate the withdrawal of water from a stratified body is introduced. The can handle large withdrawals within single time step and therefore allows use relatively long steps, considerably reducing computational expense. Good agreement with experimental work other researchers found. results simulations incorporating algorithm into dynamic reservoir model DYRESM are shown for Wellington Reservoir in Western Australia.
Abstract The serial discontinuity concept ( SDC ) proposes that hypolimnetic‐releasing impoundments cause major disruptions to the naturally occurring physical, chemical and biological gradients of rivers but this impact diminishes with distance downstream. Such a gradient in discharge, flow velocity temperature regime occurs below large impoundment, Hume Dam, on River Murray south‐eastern Australia. To examine effects disturbance warm‐water large‐bodied freshwater fish, cod Maccullochella...
Abstract. Emissions from flooded land represent a direct source of anthropogenic greenhouse gas emissions. Methane emissions large, artificial water bodies have previously been considered, with numerous studies assessing emission rates and relatively simple procedures available to determine their surface area generate upscaled estimates. In contrast, the role small (ponds) is very poorly quantified, estimation constrained both by lack data on spatial extent, scarcity flux measurements. this...
ABSTRACT The 60‐km‐long pool created by the Mildura weir exhibits pronounced physical, chemical and biological gradients along its length. As river deepens widens downstream pool, flow velocity decreases potential for thermal stratification (intensity duration of stratification) increases. Most nutrient concentrations (TN, NO x , FRP) as well euphotic depth increased in direction whereas TP turbidity decreased. increase bioavailable nutrients co‐occurred with an electrical conductivity...
Abstract. This paper reports a study of the full carbon (C-CO2) budget Australian continent, focussing on 1990–2011 in context estimates over two centuries. The work is contribution to RECCAP (REgional Carbon Cycle Assessment and Processes) project, as one numerous regional studies being synthesised RECCAP. In constructing budget, we estimate following component fluxes: Net Primary Production (NPP); Ecosystem (NEP); fire; Land Use Change (LUC); riverine export; dust harvest (wood, crop...