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Groundwater Recharge Estimation In A Fractured And Semi Arid Environment
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Book Synopsis Groundwater Recharge Estimation in a Fractured and Semi-arid Environment by : K. Keetile
Download or read book Groundwater Recharge Estimation in a Fractured and Semi-arid Environment written by K. Keetile and published by . This book was released on 2001 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of Natural Groundwater Recharge by : I. Simmers
Download or read book Estimation of Natural Groundwater Recharge written by I. Simmers and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: In view of the rapidly expanding urban, industrial and agri cultural water requirements in many areas and the normally associated critical unreliability of surface water supplies in arid and semi-arid zones, groundwater exploration and use is of fundamental importance for logical economic development. Two interrelated facets should be evident in all such groundwater projects : (a) definition of groundwater recharge mechanisms and characteristics for identified geological formations, in order to determine whether exploitation in the long-term involves 'mining' of an es sentially 'fossil' resource or withdrawal from a dynamic supply. A solution to this aspect is essential for development of a re source management policy: (b) determination of recharge variability in time and space to thus enable determination of total aquifer input and to quantify such practical aspects as 'minimum risk' waste disposal locations and artificial recharge potential via (e.g.) devegetation or engi neering works. However, current international developments relating to natural recharge indicate the following 'problems' ; no single comprehensive estimation technique can yet be iden tified from the spectrum of methods available; all are reported to give suspect results.
Book Synopsis Groundwater Recharge in a Desert Environment by :
Download or read book Groundwater Recharge in a Desert Environment written by and published by American Geophysical Union. This book was released on 2004 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Survey of Methods for Analysing Groundwater Recharge in Arid and Semi-arid Regions by :
Download or read book A Survey of Methods for Analysing Groundwater Recharge in Arid and Semi-arid Regions written by and published by . This book was released on 2002 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a water balance for the Atankwidi catchment, West Africa - A case study of groundwater recharge in a semi-arid climate by :
Download or read book Development of a water balance for the Atankwidi catchment, West Africa - A case study of groundwater recharge in a semi-arid climate written by and published by Cuvillier Verlag. This book was released on 2006-05-31 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Regolith aquifers in the weathered zone overlying Precambrian basement rocks serve as the main source of groundwater in a large part of the Volta River basin in West Africa. A prerequisite for sustainable groundwater resources management is the knowledge of recharge processes and the annual recharge rate. This research assesses the water balance, and in particular the groundwater recharge rate, for the Atankwidi catchment, a 275 km² sub-catchment of the White Volta in northern Ghana. Large uncertainties are typically inherent in any singular method to determine groundwater recharge. For this reason, an integrated approach is developed in this work which makes use of several field methods and combines results from these methods with water budget modeling. Field methods included in this approach are groundwater level observations, isotope analyses and a Chloride mass balance. The Atankwidi catchment falls within the semi-arid Sudan-Savanna climate zone. The climate is characterized by high temperatures and a single rainy season from May to October with an average annual rainfall of 990 mm. The hydrogeological system consists of three aquifers: The discontinuous, shallow aquifer, the regolith aquifer and the fracture aquifer. The principal aquifer is the regolith aquifer in the weathered mantle, which is usually targeted for drinking water supply. It forms a continuous aquifer with an average saturated thickness of 25 m and a hydraulic conductivity of 2.5E-6 to 2.5E-5 m/s. Recharge rates vary considerably between wet and dry years and between locations, with a range of 2 % to 13 % of annual rainfall. The long term recharge rate is determined by the Chloride mass balance to be approximately 6 % of average annual rainfall. The research emphasizes the importance of high rainfall intensities in creating groundwater recharge. Interannual comparison of water level fluctuations shows that a decrease in annual rainfall of 20 % causes a reduction of groundwater recharge of 30 % to 60 %. The impact of changing quantities of annual rainfall on groundwater recharge is overestimated by methods that do not account for infiltration by preferential flow. A long term average groundwater recharge of 60 mm/y compares to a total current groundwater abstraction of 4 mm/y in the study area, which is one of the areas with the highest groundwater use per km² in the Volta River basin. Recharge is therefore currently not a limiting factor for groundwater resources development. Water budget modeling using WaSIM-ETH calculates that 63 % of annual rainfall is lost to evapotranspiration in a wet year (2003), and 82 % in a dry year (2004). In the investigated mesoscale catchment 23 % and 11 % of annual rainfall end up as surface run-off in a wet year and a dry year, respectively. Approximately 40 % of surface run-off consists of interflow, while the main fraction is direct run-off. Base flow from groundwater is negligible. Groundwater flow in the regolith aquifer is modeled with Visual Modflow, assuming average hydraulic conductivities as determined by pumping test evaluation. The model calculatesthat only about 5 % of groundwater recharge leaves the basin as groundwater flow. This is evidence that the regolith aquifer does not contribute to a large extent to regional groundwater flow. Leakage to localized zones of high hydraulic conductivity of the fracture aquifer, which underlies the regolith aquifer, could act as a main sink of groundwater recharge. However, the exact location and hydraulic properties of fracture zones are largely unknown, so that the flux from the regolith aquifer to these fractures as well as the amount of flow through fractures is impossible to estimate at present. Pumping tests with observation wells to assess the specific yield, long-term pumping test at the basin outlet and a continuation of groundwater hydrograph recording at high temporal resolution could largely enhance the knowledge of hydraulic properties in the future. The groundwater model could then be improved and extended to gain certainty on the characteristics of groundwater flow.
Book Synopsis Probabilistic Estimation and Prediction of Groundwater Recharge in a Semi-arid Environment by : Gene-Hua Crystal Ng
Download or read book Probabilistic Estimation and Prediction of Groundwater Recharge in a Semi-arid Environment written by Gene-Hua Crystal Ng and published by . This book was released on 2009 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: (cont.) Our data assimilation approach also generates conditional parameter distributions, which are used to examine sensitivity of recharge to potential climate changes. A range of global circulation model predictions are considered, including wetter and drier futures. Relative changes in recharge are generally more pronounced than relative changes in rainfall, demonstrating high susceptibility to climate change impacts. The temporal distribution of rainfall changes is critical for recharge. Our results suggest that increased total precipitation or higher rain intensity during key months could make strong percolation peaks more common.
Book Synopsis Groundwater Modelling in Arid and Semi-Arid Areas by : Howard S. Wheater
Download or read book Groundwater Modelling in Arid and Semi-Arid Areas written by Howard S. Wheater and published by Cambridge University Press. This book was released on 2010-09-09 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Arid and semi-arid regions face major challenges in the management of scarce freshwater resources under pressures of population, economic development, climate change, pollution and over-abstraction. Groundwater is commonly the most important water resource in these areas. Groundwater models are widely used globally to understand groundwater systems and to guide decisions on management. However, the hydrology of arid and semi-arid areas is very different from that of humid regions, and there is little guidance on the special challenges of groundwater modelling for these areas. This book brings together the experience of internationally leading experts to fill a gap in the scientific and technical literature. It introduces state-of-the-art methods for modelling groundwater resources, illustrated with a wide-ranging set of illustrative examples from around the world. The book is valuable for researchers, practitioners in developed and developing countries, and graduate students in hydrology, hydrogeology, water resources management, environmental engineering and geography.
Book Synopsis The Estimation of Groundwater Recharge by Soil Water Balance in Semi-arid Regions by : Victor Hugo Mendes Eilers
Download or read book The Estimation of Groundwater Recharge by Soil Water Balance in Semi-arid Regions written by Victor Hugo Mendes Eilers and published by . This book was released on 2002 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating Groundwater Recharge by : Richard W. Healy
Download or read book Estimating Groundwater Recharge written by Richard W. Healy and published by Cambridge University Press. This book was released on 2010-09-30 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding groundwater recharge is essential for successful management of water resources and modeling fluid and contaminant transport within the subsurface. This book provides a critical evaluation of the theory and assumptions that underlie methods for estimating rates of groundwater recharge. Detailed explanations of the methods are provided - allowing readers to apply many of the techniques themselves without needing to consult additional references. Numerous practical examples highlight benefits and limitations of each method. Approximately 900 references allow advanced practitioners to pursue additional information on any method. For the first time, theoretical and practical considerations for selecting and applying methods for estimating groundwater recharge are covered in a single volume with uniform presentation. Hydrogeologists, water-resource specialists, civil and agricultural engineers, earth and environmental scientists and agronomists will benefit from this informative and practical book. It can serve as the primary text for a graduate-level course on groundwater recharge or as an adjunct text for courses on groundwater hydrology or hydrogeology. For the benefit of students and instructors, problem sets of varying difficulty are available at http://wwwbrr.cr.usgs.gov/projects/GW_Unsat/Recharge_Book/
Book Synopsis Estimation of Natural Groundwater Recharge by : I. Simmers
Download or read book Estimation of Natural Groundwater Recharge written by I. Simmers and published by . This book was released on 2014-01-15 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater Recharge from Run-off, Infiltration and Percolation by : K.-P. Seiler
Download or read book Groundwater Recharge from Run-off, Infiltration and Percolation written by K.-P. Seiler and published by Springer Science & Business Media. This book was released on 2007-09-26 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: To face the threats to the water supply and to maintain sustainable water management policies, detailed knowledge is needed on the surface-to-subsurface transformation link in the water cycle. Recharge flux is covered in this book as well as many other groundwater issues, including a comparison of the traditional and modern approaches to determine groundwater recharge. The authors also explain in detail the fate of groundwater recharge in the subsurface by hydraulic and geologic means, in order to stimulate adapted groundwater-management strategies.
Book Synopsis Conceptual Models of Flow and Transport in the Fractured Vadose Zone by : National Research Council
Download or read book Conceptual Models of Flow and Transport in the Fractured Vadose Zone written by National Research Council and published by National Academies Press. This book was released on 2001-05-21 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid flow and solute transport within the vadose zone, the unsaturated zone between the land surface and the water table, can be the cause of expanded plumes arising from localized contaminant sources. An understanding of vadose zone processes is, therefore, an essential prerequisite for cost-effective contaminant remediation efforts. In addition, because such features are potential avenues for rapid transport of chemicals from contamination sources to the water table, the presence of fractures and other channel-like openings in the vadose zone poses a particularly significant problem, Conceptual Models of Flow and Transport in the Fractured Vadose Zone is based on the work of a panel established under the auspices of the U.S. National Committee for Rock Mechanics. It emphasizes the importance of conceptual models and goes on to review the conceptual model development, testing, and refinement processes. The book examines fluid flow and transport mechanisms, noting the difficulty of modeling solute transport, and identifies geochemical and environmental tracer data as important components of the modeling process. Finally, the book recommends several areas for continued research.
Book Synopsis Estimating Groundwater Recharge Via Surface Infiltration in Cold Semi-arid Regions by : Laura Dean Garcia
Download or read book Estimating Groundwater Recharge Via Surface Infiltration in Cold Semi-arid Regions written by Laura Dean Garcia and published by . This book was released on 2010 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater Recharge Characteristics in a Semi-arid Environment of Southwest Idaho by : G. R. Stephenson
Download or read book Groundwater Recharge Characteristics in a Semi-arid Environment of Southwest Idaho written by G. R. Stephenson and published by . This book was released on 1981 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Geochemistry of Stable Chlorine and Bromine Isotopes by : Hans Eggenkamp
Download or read book The Geochemistry of Stable Chlorine and Bromine Isotopes written by Hans Eggenkamp and published by Springer. This book was released on 2014-08-25 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides detailed information on the history, analysis and applications of chlorine and bromine isotope geochemistry. Chlorine and bromine are geochemically unique as they prefer to exist as single charged negative ions. For this reason isotope fractionation reflects mostly processes that are not related to changes in the redox state and this fractionation is generally modest. The book will describe the processes that are most easily detected using these isotopes. Also isotope variations, and processes that cause them, measured in oxidised species such as perchlorates and in organic molecules will be described in this book.
Book Synopsis A Conceptual and Modeling Framework to Investigate Groundwater Recharge in Arid/semi-arid Environments by : Robert Henry Prucha
Download or read book A Conceptual and Modeling Framework to Investigate Groundwater Recharge in Arid/semi-arid Environments written by Robert Henry Prucha and published by . This book was released on 2002 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater in Fractured Rocks by : John M. Sharp
Download or read book Groundwater in Fractured Rocks written by John M. Sharp and published by CRC Press. This book was released on 2007-07-05 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hydrogeologic environment of fractured rocks represents vital natural systems, examples of which occur on every continent. This book discusses key issues, methodologies and techniques in the hydrogeology of fractured rocks, summarizing recent progress and anticipating the outcome of future investigations. Forty-four revised and updated papers w