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Trends In Groundwater Quality In Relation To Groundwater Age
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Book Synopsis Trends in Groundwater Quality in Relation to Groundwater Age by : Ate Visser
Download or read book Trends in Groundwater Quality in Relation to Groundwater Age written by Ate Visser and published by . This book was released on 2009 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Groundwater is a valuable natural resource and as such should be protected from chemical pollution. Because of the long travel times of pollutants through groundwater bodies, early detection of groundwater quality deterioration is necessary to efficiently protect groundwater bodies. The aim of this work was to develop and improve tools to detect trends in groundwater quality considering the reactive transport of pollutants from the ground surface to the monitoring screen. The study area of the research presented in this thesis was the province of Noord-Brabant, the Netherlands. Noord-Brabant is one of the areas in Europe which is most affected by agricultural pollution. Time-series from selected wells of the groundwater quality monitoring network were used in this thesis, in conjunction with groundwater ages determined with 3H/3He. Trend reversal of groundwater quality was demonstrated by relating concentrations of pollutants in groundwater to the time of recharge determined with 3H/3He. The quality of recharging groundwater deteriorated before 1980 but has been improving since 1990. Three types of solute specific trends were distinguished by a combination of reactive transport modeling and the analysis of concentrations related to groundwater age. These are the result of: (1) the anthropogenic trends in historical concentrations in recharging groundwater unaltered during conservative transport through the groundwater body (e.g. chloride), (2) anthropogenic trends in recharge concentrations altered by reactions during transport (e.g. retardation of potassium), and (3) geochemical reactions in the subsurface that are triggered by anthropogenic changes in the recharge concentrations of other solutes (e.g. release of sulfate, iron, and arsenic by nitrate-induced pyrite oxidation). Comparison of trend detection methods showed that there is no single optimal method to detect trends in groundwater quality across widely differing catchments. The selection of the method should firstly be made on the basis of the specific goals of the study, and secondly on the system under study, and the available resources. For trend detection in groundwater quality, the most important difference between groundwater bodies is whether the characteristics of the subsurface or the monitoring system causes mixing of groundwater with different travel times. Noble gas concentrations measured in groundwater samples, required for 3H/3He dating, showed that the production of nitrogen gas in groundwater by nitrate reduction and pyrite oxidation, leads to re-partitioning of noble gases between water and gas phase, thereby distorting groundwater dating with 3H/3He. Groundwater travel times can be estimated from degassed samples, if the total dissolved gas pressure (TDG) is used to estimate the depth and timing of degassing. The uncertainty of degassed 3H/3He ages, assessed by two-phase flow and transport simulations, had a standard deviation of 6 years with a bias of 2 years. As CFCs appear to be subject to significant degradation in anoxic groundwater and SF6 is highly susceptible to degassing, 3H/3He appears to be the most reliable method to date degassed groundwater in the anoxic parts of an aquifer. The main conclusion of this thesis is that an accurate estimate of groundwater age is of utmost importance in the detection of trends in groundwater quality."--Publisher's description.
Book Synopsis Bringing Groundwater Quality Research to the Watershed Scale by : Neil R. Thomson
Download or read book Bringing Groundwater Quality Research to the Watershed Scale written by Neil R. Thomson and published by . This book was released on 2005 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater Quality by : Harriet Nash
Download or read book Groundwater Quality written by Harriet Nash and published by Springer. This book was released on 1994-10-31 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater quality monitoring and testing is of paramount importance both in the developed and developing world. This book presents a series of papers illustrating the varied nature of current research into groundwater quality. Urban and rural supplies are covered through a case history approach, and the importance of remedial action to prevent deterioration is emphasized.
Book Synopsis Climate Change and Groundwater by : Walter Dragoni
Download or read book Climate Change and Groundwater written by Walter Dragoni and published by Geological Society of London. This book was released on 2008 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a general consensus that for the next few decades at least, the Earth will continue its warming. This will inevitably bring about serious environmental problems. For human society, the most severe will be those related to alterations of the hydrological cycle, which is already heavily influenced by human activities. Climate change will directly affect groundwater recharge, groundwater quality and the freshwater-seawater interface. The variations of groundwater storage inevitably entail a variety of geomorphological and engineering effects. In the areas where water resources are likely to diminish, groundwater will be one of the main solutions to prevent drought. In spite of its paramount importance, the issue of 'Climate Change and Groundwater' has been neglected. This volume presents some of the current understanding of the topic.
Book Synopsis Isotope Methods for Dating Old Groundwater by : International Atomic Energy Agency
Download or read book Isotope Methods for Dating Old Groundwater written by International Atomic Energy Agency and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guidebook provides theoretical and practical information for using a variety of isotope tracers for dating old groundwater, i.e. water stored in geological formations for periods ranging from about 1000 to one million years. Theoretical underpinnings of the methods and guidelines for their use in different hydrogeological environments are described. The guidebook also presents a number of case studies providing insight into how various isotopes have been used in aquifers around the world. The methods, findings and conclusions presented in this publication will enable students and practicing groundwater scientists to evaluate the use of isotope dating tools for specific issues related to the assessment and management of groundwater resources. In addition, the guidebook will be of use to the scientific community interested in issues related to radioactive waste disposal in geological repositories.
Book Synopsis Scientific Investigations Report by : Sharon E. Kroening
Download or read book Scientific Investigations Report written by Sharon E. Kroening and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessing Ground-water Vulnerability to Contamination by : Michael J. Focazio
Download or read book Assessing Ground-water Vulnerability to Contamination written by Michael J. Focazio and published by . This book was released on 2002 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater Age by : Gholam A. Kazemi
Download or read book Groundwater Age written by Gholam A. Kazemi and published by John Wiley & Sons. This book was released on 2006-06-30 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater Age is the first book of its kind that incorporates and synthesizes the state-of-the-art knowledge about the business of groundwater dating - including historical development, principles, applications, various methods, and likely future progress in the concept. It is a well-organized, advanced, clearly written resource for all the professionals, scientists, graduate students, consultants, and water sector managers who deal with groundwater and who seek a comprehensive treatment of the subject of groundwater age.
Download or read book National Water Summary written by and published by . This book was released on 1993 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geohydrology, Geochemistry, and Ground-water Simulation-optimization of the Central and West Coast Basins, Los Angeles County, California by :
Download or read book Geohydrology, Geochemistry, and Ground-water Simulation-optimization of the Central and West Coast Basins, Los Angeles County, California written by and published by . This book was released on 2003 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater Contamination and Remediation by : Timothy D. Scheibe
Download or read book Groundwater Contamination and Remediation written by Timothy D. Scheibe and published by MDPI. This book was released on 2018-12-07 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Groundwater Contamination and Remediation" that was published in Water
Book Synopsis Hydrogeology Of, and Quality and Recharge Ages of Ground Water in Prince William County, Virginia, 1990-91 by : David L. Nelms
Download or read book Hydrogeology Of, and Quality and Recharge Ages of Ground Water in Prince William County, Virginia, 1990-91 written by David L. Nelms and published by . This book was released on 1997 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Natural Groundwater Quality by : W. Mike Edmunds
Download or read book Natural Groundwater Quality written by W. Mike Edmunds and published by John Wiley & Sons. This book was released on 2009-01-26 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text presents a series of thematic chapters together with chapters on representative groundwater systems in Europe which illustrate the main processes and evolution of water quality. Brings together the research of a consortium of leading European scientists who have conducted detailed studies of water quality in Europe Includes a synthesis of findings, highlighting the thematic and regional results, with recommendations regarding aquifer evaluation, indicators, monitoring, and drinking water standards Creates a key reference work on natural water quality of aquifers, at a time when the Groundwater Directive (GD) will shortly be brought in to supplement The European Water Framework Directive (WFD) to ensure good status of groundwater
Book Synopsis Tracerlpm (Version 1) by : Bryant C. Jurgens
Download or read book Tracerlpm (Version 1) written by Bryant C. Jurgens and published by CreateSpace. This book was released on 2014-06-16 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: TracerLPM is an interactive Excel(r) (2007 or later) workbook program for evaluating groundwater age distributions from environmental tracer data by using lumped parameter models (LPMs). Lumped parameter models are hydrodynamic dispersion or mixing within the aquifer, well bore, or discharge area. Five primary LPMs are included in exponential model (PEM), and dispersion model (DM). Binary mixing models (BMM) can be created by combining primary LPMs in various combinations. Travel time through the unsaturated zone can be included as an additional parameter. TracerLPM also allows users to enter age distributions determined from other methods, such as particle tracking LPMs not included in this program. Tracers of both young groundwater (anthropogenic atmospheric gases and isotopic substances indicating post-1940s recharge) and much older groundwater (carbon-14 and helium-4) can be interpreted simultaneously so that estimates of the groundwater age distribution for samples with a wide range of ages can be constrained.
Book Synopsis Groundwater Monitoring by : Anne Marie Fouillac
Download or read book Groundwater Monitoring written by Anne Marie Fouillac and published by John Wiley & Sons. This book was released on 2009-08-25 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is sometimes called “the hidden asset” – awareness of its existence and its importance is not well known and as a consequence the measures which are required to protect and manage it in an environmental sustainable way are either not taken or are taken too late. Where pollution has occurred and measures are taken too late it may take decades, or longer, until the necessary restoration of quality is achieved. This comprehensive text presents in the following sections: Groundwater monitoring in the regulatory and international context Conceptual modelling and network design Groundwater pollutants and other pressures Groundwater quality standards and trend assessment Case studies for groundwater assessment and monitoring in the light of EU legislation Groundwater measurements Associating external stakeholders The editors have collected state-of-the-art information on groundwater quality assessment monitoring from the international community, providing further stimulation to the work of all parties involved in the challenges this area creates to ensure sound quality assessment of groundwater.
Book Synopsis Environmental Tracers by : Trevor Elliot
Download or read book Environmental Tracers written by Trevor Elliot and published by MDPI. This book was released on 2018-10-08 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Environmental Tracers" that was published in Water
Book Synopsis Climate Change Effects on Groundwater Resources by : Holger Treidel
Download or read book Climate Change Effects on Groundwater Resources written by Holger Treidel and published by CRC Press. This book was released on 2011-12-02 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change is expected to modify the hydrological cycle and affect freshwater resources. Groundwater is a critical source of fresh drinking water for almost half of the worlds population and it also supplies irrigated agriculture. Groundwater is also important in sustaining streams, lakes, wetlands, and associated ecosystems. But despite this,
