Groundwater recharge in eastern Great Artesian Basin catchments using multi-isotope studies. The Springbok Sandstone in the Surat Basin (Queensland, Australia) are large artesian basin aquifers.
Cumulative Groundwater Impacts - Assessment &
Hydraulic conductivity of jointed rocks is one of the main input parameters for a whole groundwater modeling and assessment. Furthermore, the magnitude of the horizontal stress is usually proportional to the stiffness of the material in which the measurement is taken.
Management
These criteria relate to ecological resources, culturally significant sites, existing groundwater supply works and the local sustainability of the groundwater system. The cumulative effects of the change in pumping voltages associated with trading have been included in the assessment.
Recharge & Groundwater - Surface Water Interaction
The model allows estimation of the velocity field and water exchange flux between the river and the aquifer in the hyporheic zone. This new understanding of the recharge resulted in a significant revision of the conceptual hydrogeological model for the region.
Indigenous Groundwater Connections, Knowledge and Values
Before European settlement, these were the only source of water for the people of the Great Sandy Desert and are an integral part of the Ngurrara culture. The Jila and Jumu of the Great Sandy Desert are different in hydrogeological environment and water chemistry.
Special Session: Springs of the Great Artesian Basin - The Royal Society of Queensland Special
Characterization of the groundwater shows that both NaHCO3 and Na-Cl type water occur in the project area. Regional groundwater levels indicate groundwater flows from the southern and northern parts of the project area towards a.
Issue
This presentation describes the background and impetus for this special session on the resources of the Great Artesian Basin, sponsored by the Royal Society of. Artesian springs of the Great Artesian Basin – hydrogeology, hydrochemistry and age dating of artesian groundwater and spring deposits.
Emerging Analytical & Numerical Methods
The proposed methodology was applied in Lake Muir-Unicup Natural Diversity Recovery Catchment (MUNDRC). Conceptual and numerical models of groundwater and surface water were developed to assess the effects of reduced precipitation on lakes and the surrounding environment.
Groundwater Dependent Ecosystems
Preliminary analysis of earth observation data improved understanding of surface water–groundwater interactions in the Isa GBA region and complemented analysis of sparse streamflow, groundwater, and hydrochemical data. A review of progress in the identification and characterization of groundwater-dependent ecosystems using geospatial technologies.
Recharge & Groundwater-Surface Water Interaction/Novel Investigation Techniques
Methodology: Groundwater discharge processes were evaluated at sites where groundwater and surface water chemistry allowed their relative inputs to be estimated. Summary and Conclusions: The results highlight the importance of temporal monitoring of stream and groundwater systems to assess the dynamics of groundwater discharge to surface waters.
Community Engagement, Cultural Values and Groundwater Resources
One of the reasons for this poor management is the excessive use of groundwater without proper recharge. To address this, user panels have been established in the target regions as part of the assessment.
Posters – Monday 25th November 2019
Several environmental assets have been identified that may be sensitive to project groundwater impacts. Characterization of the groundwater system and subsequent impact assessment for the project involved conducting investigations in a challenging environment. In contrast, between 39 and 46% of rainfall during the drainage season was vertically recharged to the shallow groundwater at Waharoa.
For many rivers, the distribution of groundwater inflow and the composition of the groundwater are poorly known, hindering the understanding of catchment functioning.
Big Data & Innovation Applications
Additional information may also be displayed to aid in the visual interpretation of the data. The discovery of a new fresh groundwater resource (<1,000 mg/L) in the APY lands has enormous potential for the future development of this remote region of southern Australia. The most significant challenge in the development of the DANS numerical model was the implementation of a turbulence model that enables a transition between a.
However, in cases where significant landscape evolution occurs (e.g. the development of an open pit mine), it is difficult to accurately represent these changes in the model due to the limitations of the fixed model which does not capture dynamic changes in the surface water and groundwater cannot reflect. flow system.
Nutrients Diffuse Pollution in Aquifers &
In this study, a new MODFLOW package was developed to simulate the effect of external loading on the groundwater level. Considering that the load influence decreases with the increase in depth, two types of equations (i.e., linear and power) were also introduced in the package to simulate the load dissipation. The new package was tested on an identical sample simulation to that provided in the SWT package.
Modeling was carried out with the presence of an external load assuming that the flood waters are 0.1 m deep.
Catchments
This has been observed in the UK Chalk, with the matric water becoming a 'source' of nitrate as land use. Although the work in the UK has been carried out over several decades, quantification of the coming nitrate load has not yet begun in New Zealand. The higher removal efficiency in 2017 can be attributed to; the much longer residence time of the water in the bioreactor (average=22 days vs 5 days in 2018) which provides more opportunity for microorganisms to reduce the nitrate in the water; and the availability of electron donor (DOC) to support denitrification.
Very long residence times in 2017 promoted severely reduced conditions, resulting in hydrogen sulfide and methane production.
Coastal Processes & Tropical Island Hydrogeology
The thickness of a freshwater lens generally depends on the degree of filling, the width of the island, and the hydraulic conductivity of the lens. The model was used to investigate the feasibility and impacts of increased groundwater demand on the freshwater lens, its volume, geometry and thickness of the transition zone between freshwater and saltwater. Objectives: This project aims to identify areas of SGD occurring as freshwater estuaries at Sellicks Beach, South Australia, located in the south-western part of the Willunga Basin.
The results suggest that airborne geophysics can be used as an effective tool in further determining groundwater resources and managing other remote parts of the area.
Geophysical & Petrophysical Methods &
Groundwater
Measuring depth to groundwater in monitoring boreholes is one of the most fundamental observations in hydrogeology. Significant analysis at the injection sites has been undertaken to improve well control and performance during drilling, injection and cleanup as part of the GWR project. Ultra-basic, highly reducing conditions combined with depleted magnesium and sulfate conditions were observed in the downward gradient of groundwater at the Twin Hills gold mining operations in northern Queensland.
Below most parts of the Twin Hills Mine, evaporation during recharge is the dominant mechanism controlling dissolved solids concentrations in groundwater.
Abstracts presented on Tuesday 26 November 2019
Groundwater Contamination & Remediation
The majority of coal tar NAPL was slightly denser than water (1.03 SG), had a low viscosity at 15 degrees Celsius, and rested within the poorly sorted clayey, sandy gravel lenses of the upper alluvial aquifer. Electrical resistivity tomography methods were used to gain knowledge of the underground conditions and to inform the design of the wall. Tritium, radiocarbon and other environmental isotope data will be used to refine these interpretations and improve understanding of the extent of inter-aquifer connectivity.
Using these samples, we conducted an in-depth assessment of the relationship between PFAS and in situ microbials.
Groundwater Resources Vulnerability in a Changing Climate
The combined impact of reduced water availability and increased demand was considered for the future exploitation of the Barwon Downs borefield in south-west Victoria. To support the license renewal of the Barwon Downs drilling field, climate change impacts on demand forecasts and aquifer recharge were assessed. As part of the numerical modeling assessment, a number of predictive modeling scenarios were used to address future climate change.
Much of the conceptual understanding of aquifers has been developed through an old, defunct government.
Social Engagement, Attitudes & Connection to Groundwater
The presentation's presentation included the use of physical props, videos and an interactive question and answer session. In early 2018, following the completion of the pilot programme, the network was expanded to the Barossa Valley region. The test was conducted under high rainfall conditions, where the identification of the groundwater table and the estimation of the thickness of the freshwater lens were the main objectives.
Due to issues related to borehole integrity (past borehole construction practices, age of the boreholes and groundwater quality), a large number of the boreholes required reconditioning/rehabilitation.
Use of Big Data & Groundwater Databases - Mapping, Cleansing & Maintenance
Validation and scaling of measured groundwater use data for the development of the Central Condamine groundwater flow model. Furthermore, only a small amount of porosity and permeability data is publicly available and no petrophysical model of the Springbok Sandstone has been published in the peer-reviewed literature. Field reduction of passive microwave soil moisture retrieval using a neural network trained on integrated hydrologic model predictions.
The state-of-the-art in neural network downscaling methods is also limited by the extreme sparseness of soil moisture probe datasets.
Data Assimilation & Metrics for Models in Decision Support Roles
Also, assimilating new measurement data into the model that is continuously collected in the field traditionally requires recalibration of the model. In modeling practice, this fact can result in reduced effort for predictive uncertainty analysis and ultimately reduce the value of the model to support. This study presents an early application of the iterative ensemble damping (IES) method of constrained calibration uncertainty analysis to address.
The flexibility of the IES method made it possible to include 1,493 adjustable parameters and geostatistics.
Climate Change/Variability Impacts and Water Security in Tropical & Arid Climates
Rationalization of the Shepparton Irrigation Region's public groundwater pumping network - an adaptive response to a changing climate. High-intensity rainfall erodes the topsoil, reducing the water-holding capacity and recharge capacity of the surface. Since the construction of the Burdekin Haughton Water Supply Scheme (WSS) in the late 1980s, groundwater levels have risen by up to 10 metres.
Equilibrium has been reached in the coastal areas of the BGMA, mainly through increased runoff, as the water table has risen and crossed surface water runoff.
Stygofauna & Microbiology
This study provides a preliminary unraveling of the biochemical fluxes driven by rainfall in a calcareous aquifer. Samples were collected between 2015-2016 at three locations within the Maules Creek catchment, a sub-catchment of the Murray-Darling Basin in NW NSW. Objectives: This study examined several lines of evidence to determine effective strategies for remediation of the nitrogen-contaminated groundwater.
Simultaneously, the effects of different treatments on the microbial ecosystem were investigated to determine any deleterious effects on nitrogen plumes and their associated.
Intermittent/Ephemeral Drainage Systems
167 | Indicate the catchment's vulnerability to the effects of drought and the potential impacts of falls on the shallow groundwater system. This geologic transition results in groundwater discharge that maintains stream flow along permanent stream sections. Soil loss to evaporation is an important but usually only roughly estimated component of the water budget of dryland stream basins.
Our experimental site was in the semi-arid and subtropical Hamersley Basin in the Pilbara region of northwestern Australia.
Tracers & Isotopes
Alice Springs is an important center for regional industry, tourism and transport in the Northern Territory. Using environmental tracers to determine recharge mechanisms and change in the semi-arid Pilbara region. We used environmental tracer techniques (including stable isotopes, radioisotopes and anthropogenic compounds) to assess transient stream recharge processes in the Pilbara region of northwestern Australia.
The model applied a groundwater age correction approach proportional to the flow rate in the system.
Posters – Tuesday 25th November 2019
A comparison of methods for numerically simulating the unsaturated zone in the Murray River floodplain SA. A new hydrogeochemical investigation using Pb and Sr isotopes in the vicinity of the Century Pb-Zn Mine, NW Queensland, Australia. Protection of environmental water in the context of groundwater then requires protection of water in the aquifer and those surfaces and.
Groundwater flow paths of the main basal system were traced from higher elevations in the mountains to the Burdekin River.
Reporting and compliance of groundwater use under the Murray- Darling Basin Plan
