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A Spatial And Statistical Assessment Of The Vulnerability Of Texas Groundwater To Nitrate Contamination
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Book Synopsis A Spatial and Statistical Assessment of the Vulnerability of Texas Groundwater to Nitrate Contamination by : Thomas Anders Evans
Download or read book A Spatial and Statistical Assessment of the Vulnerability of Texas Groundwater to Nitrate Contamination written by Thomas Anders Evans and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrate concentrations in Texas water wells are analyzed using spatial and statistical representations.
Book Synopsis A Spatial and Statistical Assessment of the Vulnerability of Texas Groundwater to Nitrate Contamination by : Thomas Anders Evans
Download or read book A Spatial and Statistical Assessment of the Vulnerability of Texas Groundwater to Nitrate Contamination written by Thomas Anders Evans and published by . This book was released on 1995 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Groundwater Vulnerability by : Boris Faybishenko
Download or read book Groundwater Vulnerability written by Boris Faybishenko and published by John Wiley & Sons. This book was released on 2014-10-07 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chernobyl Nuclear Power Plant (NPP) disaster that occurred in Ukraine on April 26, 1986, was one of the most devastating in human history. Using this as a case study, the AGU monograph Groundwater Vulnerability: Chernobyl Nuclear Disaster is devoted to the problem of groundwater vulnerability, where the results of long-term field and modeling investigations of radionuclide transport in soil and groundwater, within the Ukrainian part of the Dnieper River basin (Kyiv region of Ukraine), are discussed. The authors provide a comprehensive review of existing literature on the assessment of groundwater vulnerability and then describe an improved methodology, which is developed based on integration of the methods of hydrogeological zonation and modeling of anomalously fast migration of radioactive contaminants from the land surface toward groundwater. This volume also includes the evaluation of the effect of preferential and episodic flow on transport of radionuclides toward the aquifers and risk assessment of groundwater vulnerability, which can further assist future researchers in developing remediation technologies for improving drinking water quality. Further, this volume sheds light on the consequences of groundwater contamination from nuclear disasters and assists with assessing the risks associated with contamination and developing effective remediation technologies. Volume highlights include discussions of the following: Assessment of groundwater vulnerability to contamination from the Chernobyl nuclear disaster Novel analytical results of the 25-year investigations of groundwater contamination caused by Chernobyl-born radionuclides The wealth of data on different modes of radioactive transport in the atmosphere, water, and soils, and along the food chains The hydrogeological and physico-chemical processes and factors in groundwater contaminated zones The applicability of commonly used methods of the evaluation of groundwater vulnerability A unique method of fluid dynamics that involves an anomalously fast migration of contaminants through zones of preferential flow from the land surface toward groundwater Building confidence in the assessment of migration pathways of radionuclides in the biosphere Assessment and prediction of the consequences of the nuclear accident, which can shed light on protection from global nuclear accidents Analogue information for different nuclear waste disposal and environmental projects around the world
Book Synopsis Vulnerability of Ground Water to Contamination, Edwards Aquifer Recharge Zone, Bexar County, Texas, 1998 by : Allan K. Clark
Download or read book Vulnerability of Ground Water to Contamination, Edwards Aquifer Recharge Zone, Bexar County, Texas, 1998 written by Allan K. Clark and published by . This book was released on 2000 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vulnerability of Ground Water to Contamination, Northern Bexar County, Texas by : Amy Richter Clark
Download or read book Vulnerability of Ground Water to Contamination, Northern Bexar County, Texas written by Amy Richter Clark and published by . This book was released on 2003 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Watersheds, Groundwater and Drinking Water by : Thomas Harter
Download or read book Watersheds, Groundwater and Drinking Water written by Thomas Harter and published by UCANR Publications. This book was released on 2008 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide will help resource managers, planners, and other decision makers better understand and assess water supplies and to define and manage protection areas for water sources. Developed for those who are interested in water resources, it can easily be used as text material for educational short courses.
Book Synopsis Groundwater Vulnerability Assessment for Nitrate Pollution in the Salinas Valley Using a Modified DRASTIC Model by : Bernadette Boyle
Download or read book Groundwater Vulnerability Assessment for Nitrate Pollution in the Salinas Valley Using a Modified DRASTIC Model written by Bernadette Boyle and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is an integral piece of California's groundwater resources. One of the most common contaminants present in groundwater is nitrate. Nitrate contamination is often a result of agricultural land use activities on the ground surface. The study area for this analysis is the Salinas Valley Groundwater Basin, an agriculturally dominated basin in coastal California. The Salinas Valley Basin is both one of the most agriculturally productive areas of the state, as well as one of the most nitrate-contaminated basins in the state. The purpose of this research was to develop a groundwater vulnerability map for nitrate pollution in the Salinas Valley. A groundwater vulnerability assessment was carried out using a modified DRASTIC model. DRASTIC is a U.S. EPA rank-sum model for assessing groundwater vulnerability that incorporates depth to water, net recharge, aquifer media, soil media, topography, impact of the vadose zone, and hydraulic conductivity. In order to modify the DRASTIC model to assess nitrate contamination specifically, a land use parameter was incorporated into the model. The results of this assessment found 2.9% of the Basin has very low vulnerability, 50.6% has low vulnerability, 42.9% has moderate vulnerability, and 3.6% has high vulnerability. The results of the groundwater vulnerability assessment could not be validated using measured nitrate concentrations in the Basin. Four possible reasons for the poor fit of this assessment have been identified: (1) the temporal variability of select DRASTIC parameters, (2) the inability of the land use parameter to accurately represent nitrate vulnerability, (3) the high spatial variable of nitrate contamination in the Basin, and (4) the static weights assigned to parameters by the DRASTIC model.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1995 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Jordan's Arid Badia by : Roderic Dutton
Download or read book Jordan's Arid Badia written by Roderic Dutton and published by Smith-Gordon & Company. This book was released on 2008 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geomorphology, geology and minerals, and livestock management are assessed together with regional land use and land use planning; and the overall biodiversity of the region is described. Complementary to environmental studies are social studies of the health, nutrition, employment, livelihood and disability status of the population. The Badia Programme has been able to combine modern approaches to information gathering (including techniques such as remote sensing) with the traditional knowledge of the Bedouin as twin cornerstones to achieving an understanding of the geography of this important and characteristic region of the Middle East. In the words of the project leaders 'We are learning that fragile as desert systems may be, they remain robust in terms of their ability to respond to change'. The result is, if not a textbook, a rich source of reference in human geography that will be useful to teachers and students.
Book Synopsis Source Characterization and Vulnerability Assessment of Nitrate Contamination in Groundwater by : Riyana Ayub
Download or read book Source Characterization and Vulnerability Assessment of Nitrate Contamination in Groundwater written by Riyana Ayub and published by . This book was released on 2022 with total page 0 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 1984 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Texas Water Resources by : Dipankar Dwivedi
Download or read book Texas Water Resources written by Dipankar Dwivedi and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical models of flow and transport are commonly applied for the sustainable management of water resources and for the selection of appropriate remediation techniques. However, these numerical models are not always accurate due to uncertain parameters and the disparity of scales across which observations are made, hydrological processes occur, and modeling is conducted. The modeling framework becomes further complex because hydrologic processes are coupled with chemical and biological processes. This dissertation focuses on the most widespread contaminants of surface and ground water, which are E. coli and nitrate, respectively. Therefore, this research investigates the linkages between bio-chemical and hydrologic processes for E. coli transport, explores the spatio-temporal variability of nitrate, quantifies uncertainty, and develops models for both E. coli and nitrate transport that better characterize these biogeochemical linkages. A probabilistic framework in the form of Bayesian Neural Networks (BNN) was used to estimate E. coli loads in surface streams and was compared with a conventional model LOADEST. This probabilistic framework is crucial when water quality data are scarce, and most models require a large number of mechanistic parameters to estimate E. coli concentrations. Results indicate that BNN provides better characterization of E. coli at higher loadings. Results also provide the physical, chemical, and biological factors that are critical in the estimation of E. coli concentrations in Plum Creek, Texas. To explore model parameters that control the transport of E. coli in the groundwater (GW) and surface water systems, research was conducted in Lake Granbury, Texas. Results highlight the importance of flow regimes and seasonal variability on E. coli transport. To explore the spatio-temporal variability of nitrate across the Trinity and Ogallala aquifers in Texas, an entropy-based method and a numerical study were employed. Results indicate that the overall mean nitrate-N has declined from 1940 to 2008 in the Trinity Aquifer as opposed to an increase in the Ogallala Aquifer. The numerical study results demonstrate the effect of different factors like GW pumping, flow parameters, hydrogeology of the site at multiple spatial scales. To quantify the uncertainty of nitrate transport in GW, an ensemble Kalman filter was used in combination with the MODFLOW-MT3DMS models. Results indicate that the EnKF notably improves the estimation of nitrate-N concentrations in GW. A conceptual modeling framework with deterministic physical processes and stochastic bio-chemical processes was devised to independently model E. coli and nitrate transport in the subsurface. Results indicate that model structural uncertainty provides useful insights to modeling E. coli and nitrate transport. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148125
Book Synopsis Journal of GIS, Remote Sensing and Dynamic Modelling by :
Download or read book Journal of GIS, Remote Sensing and Dynamic Modelling written by and published by . This book was released on 2001 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vulnerability of Shallow Aquifers of the Conterminous United States to Nitrate by : Karthik Kumarasamy
Download or read book Vulnerability of Shallow Aquifers of the Conterminous United States to Nitrate written by Karthik Kumarasamy and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is an important natural resource for numerous human activities, accounting for more than 50% of the total water used in the United States. Groundwater is vulnerable to contamination by several organic and inorganic pollutants such as nitrate, heavy metals, and pesticides. Assessment of groundwater vulnerability aids in the management and protection of limited groundwater resources. The focus of this thesis is to (1) statistically compare two groundwater vulnerability assessment models; modified DRASTIC (Acronym for Depth to water, net Recharge, Aquifer media, Soil media, Topography, Impact of vadose zone, and hydraulic Conductivity of aquifer) and ordinal logistic regression for NO3- contamination of shallow groundwater of the US, (2) analyze any discrepancies in the predictability of each of these models, and (3) discuss the advantage of each of the above-mentioned models with respect to performance, data requirement, and its ability to predict vulnerability. Analysis of NO3- concentration in groundwater allows for a reliable comparison of the two models. The results from the OLR model indicate a better correlation between the observed and average predicted probabilities. A very low R2 value was obtained between the modified DRASTIC and nitrate concentration, indicating poor prediction capabilities and need for high resolution data. Limitation with respect to requirement of more data with respect to prediction is seen in both the methods.
Book Synopsis GIS and Geocomputation for Water Resource Science and Engineering by : Barnali Dixon
Download or read book GIS and Geocomputation for Water Resource Science and Engineering written by Barnali Dixon and published by John Wiley & Sons. This book was released on 2015-11-25 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: GIS and Geocomputation for Water Resource Science and Engineering not only provides a comprehensive introduction to the fundamentals of geographic information systems but also demonstrates how GIS and mathematical models can be integrated to develop spatial decision support systems to support water resources planning, management and engineering. The book uses a hands-on active learning approach to introduce fundamental concepts and numerous case-studies are provided to reinforce learning and demonstrate practical aspects. The benefits and challenges of using GIS in environmental and water resources fields are clearly tackled in this book, demonstrating how these technologies can be used to harness increasingly available digital data to develop spatially-oriented sustainable solutions. In addition to providing a strong grounding on fundamentals, the book also demonstrates how GIS can be combined with traditional physics-based and statistical models as well as information-theoretic tools like neural networks and fuzzy set theory.
Book Synopsis Water-resources Investigations Report by :
Download or read book Water-resources Investigations Report written by and published by . This book was released on 2002 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Case Studies in Geospatial Applications to Groundwater Resources by : Pravat Kumar Shit
Download or read book Case Studies in Geospatial Applications to Groundwater Resources written by Pravat Kumar Shit and published by Elsevier. This book was released on 2022-10-21 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Case Studies in Geospatial Applications to Groundwater Resources provides thorough the most up-to-date techniques in GIS and geostatistics as they relate to groundwater, through detailed case studies that prove real-world applications of remote sensing applications to this subject. Groundwater is the primary source of fresh water in many parts of the world, while come regions are becoming overly dependent on it, consuming groundwater faster than it is naturally replenished and causing water tables to decline unremittingly. India is the largest user of groundwater in the world followed by China and the USA, with developing countries using groundwater at an unsustainable rate. Systematic planning of groundwater usage using modern techniques is essential for the proper utilization, management and modeling of this precious but shrinking natural resource. With the advent of powerful and highspeed personal computers, efficient techniques for water management have evolved, of which remote sensing, GIS (Geographic Information Systems), GPS (Global Positioning Systems) and Geostatistical techniques are of great significance. This book advances the scientific understanding, development, and application of geospatial technologies related to water resource management. Case Studies in Geospatial Applications to Groundwater Resources is a valuable reference for researchers and postgraduate students in Earth and Environmental Sciences, especially GIS, agriculture, hydrology, natural resources, and soil science, who need to be able to apply the latest technologies in groundwater research in a practical manner. Provides detailed case studies on groundwater resources around the world, including regions with highest groundwater resource use Covers modern remote sensing and geostatistical technique-based groundwater resource mapping, monitoring, and modelling Describes novel region-specific management strategies and techniques for sustainability with case studies to illustrate effectiveness Includes practical coverage of the use of geospatial analysis techniques in groundwater resources
