Download or read book A Hydrogeochemical Investigation of the Surface Water and Groundwater Interactions of a Semi arid Wetland System Western Australia written by Lindsay Bourke and published by . This book was released on 2011 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] A 932 ha subcatchment and its associated wetland suite, located in the semi-arid wheatbelt region Western Australia, was investigated in this study. The lower part of the subcatchment exhibits environmental degradation due to altered hydrology resulting from clearing of deep-rooted perennial vegetation. Two main potential threats exist; firstly, upgradient migration of hypersaline groundwater from a regional primary saline valley floor; secondly, increased water and solute loads due to enhanced recharge within the local subcatchment. The hydrological function of the subcatchment and individual wetlands, and uncertainties relating to spatial scales of influence was investigated through combing physical hydrological and hydrochemical methods. A long-term trend of rising groundwater levels within the study area is evident since the clearing of vegetation, and levels have continued to rise since 2006 at about +0.06 m/yr. A ten-fold increase in the TDS at a hyposaline wetland since 1970 indicates active discharge of both stored and replenished water and solutes to the lower catchment. These trends are occurring in spite of a declining regional rainfall trend since the mid 1970's. The aquifers in the lower discharge area appear to be near full capacity although the subcatchment is yet to reach a post-clearing hydrological equilibrium. Significant groundwater TDS and density gradients occur across the study area, increasing rapidly down gradient in both the unconfined and semi-confined aquifers. The ionic compositions of groundwater, surface water and rainfall are dominated by Cl- and Na-, with overall composition being largely proportional to seawater. Cl-/Br- weight ratios indicate that halite dissolution is unlikely to be a primary factor in elevated ionic concentration. Hence, solutes are chiefly sourced from marine-derived aerosols in rainfall. Elevated nutrient concentrations (high N and lower P) were observed, although the absence of algal blooms in wetlands indicates that P is likely a limiting nutrient. Fractionation enriched stable isotopes (eD and e18O) and greater ion concentrations are observed in the deep hypersaline semi-confined aquifer compared to the regional primary saline valley floor aquifer. This indicates the occurrence of reflux brines beneath the hypersaline wetland, resulting in the export of solutes to the underlying aquifers. Seasonal changes in both ionic and stable isotope (eD and e18O) composition within the deep hypersaline semi-confined aquifer further suggest that water and solute exchange is driven by both groundwater head and density gradients. Excess recharge in the upper recharge domain is expressed down gradient at the lower discharge domain as both groundwater discharge and enhanced surface water flows...
Download or read book Interaction Between Surface Water and Groundwater in a Coastal Wetlands System written by Selvarajah Marimuthu and published by . This book was released on 2005 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction Between Groundwater and Surface Water in a Coastal Wetlands System in South Western Australia written by S. Marimuthu and published by . This book was released on 2003 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface water acidification arising from aquifers impacted by agricultural practices written by Adam Michael Lillicrap and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated] Groundwater is an important resource to humans and ecosystems, especially in arid and semiarid environments where it may be the only source of water. Its value as a resource, however, is reduced when it becomes contaminated through anthropogenic activities. This research focuses on acidic groundwater which remains poorly understood but can have a significant impact on surface water environments, leading to both direct and indirect stress on organisms and ecosystem health. Acidification of groundwater can be caused by atmospheric deposition (acid rain), acid mine drainage and disturbance of acid sulfate soils. Often as a result of agricultural practices. Agricultural practices have caused acidification of groundwater dependent environments in south-western Australia (SWA) where the draining of coastal wetlands for horticulture exposed naturally occurring sulfides that oxidised to generate acid. Additionally, within the inland areas of SWA, ephemeral aquifers provided low salinity neutral baseflow to waterways, however following the clearing of native vegetation for agriculture, naturally occurring deeper acid-saline groundwater now discharge to waterways. It is estimated that there are over 350 km of acidified waterways in the Avon catchment of SWA that have resulted from agricultural practices, though the acidification of surface waters is spatially and temporally heterogeneous. This research aimed to further our understanding of SWA acidic groundwater sources, controls and impacts, through a series of field investigations, statistical analysis of historical groundwater and mapping data, and hydrological and geochemical modelling. Finally, since the management of acidification impacts remains challenging within broad-acre semi-arid landscapes, a pilot scale passive treatment system was built to test its suitability for remediating acidified stream waters. This thesis firstly presents an investigation into acidification processes and their impacts on a coastal wetland disturbed by agricultural practices, with a particular focus on surface water - groundwater interactions and the resulting hydrological and geochemical processes. These investigations found that the lowering of watertables, especially with the aid of drainage, over the dryer summer months led to oxidation of sulfides within surficial soil profiles, generating substantial acidity within the unsaturated zone. With the onset of winter rains, the watertable rose redissolving the acid products. The groundwater continued to rise to form a series of disconnected pools, some of which were extremely acid due to the redissolved salts. The pools eventually linked, establishing surface water connectivity, acid dispersion and subsequent discharge from the site. A water balance model for the site was developed and it was identified that manipulation of watertables through control of drainage and placement of organic mulches over sulfidic sediments and soils to minimise evaporation are possible management options for the site.
Download or read book Groundwater surface Water Interaction Along Gingin Brook Western Australia written by and published by . This book was released on 2011 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1986 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Groundwater in Arid and Semi Arid Areas written by Shakir Ali and published by Springer Nature. This book was released on 2023-10-24 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides comprehensive studies from Middle East, African countries and Asia including Afghanistan, Algeria, Egypt, India, Iraq, Kyrgyzstan, Tunisia and Turkey on groundwater management, modelling and monitoring. A broad approach such as modelling, artificial intelligence, machine learning, and statistical models was applied in arid and semi-arid areas for management of the groundwater. These new approaches are currently in high demand. The book delves into the applications of these methods and will be a potential asset to the researchers worldwide. The book is a timely publication containing chapters based on primary data or/and extensive review chapters comprising new emerging techniques. Current high-demand research on management through the application of modelling, artificial intelligence and machine learning is the main selling point of this book.
Download or read book Groundwater Research written by Commonwealth Scientific and Industrial Research Organization (Australia). Division of Groundwater Research and published by . This book was released on 1984 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Groundwater the Strategic Resource written by A. D. Allen and published by . This book was released on 1997 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical and Chemical Techniques for Discharge Studies written by RB Salama and published by CSIRO PUBLISHING. This book was released on 1996-01-01 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater discharge is associated with salinity and pollution problems. The widespread presence of millions of saline lakes in North America, Africa and Australia, shows that across the geological record, most salinity and desertification problems have been caused by saline groundwater discharge. In recent times, dryland salinity has spread widely in southern Australia, resulting in the loss of more than 50% of the fresh streams in Western Australia and causing major salinity problems in the Murray River in South Australia.
Download or read book Field Investigation of Groundwater Surface Water Interactions Ruataniwha Plains written by Caroline Meilhac and published by . This book was released on 2009 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogeochemical Study of Groundwater from an Unconfined Aquifer in the Vicinity of Perth W A written by Richard E. Martin and published by . This book was released on 1980 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Groundwater Investigation Program in Western Australia 2005 to 2020 written by and published by . This book was released on 2005 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Resources and Use in Semi arid Western Australia written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Impact of Agricultural Development on the Salinity of Surface Water Resources of South west Western Australia written by N. J. Schofield and published by . This book was released on 1988 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Palaeovalley Groundwater Resources in Arid and Semi Arid Australia written by John W. Magee and published by . This book was released on 2009 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogeochemical Study of Groundwater from an Unconfined Aquifer in the Vicinity of Perth W A written by Richard E. Martin and published by . This book was released on 1982 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
