Impacts Of Estimating Recharge On Groundwater Modeling For Arid Basins

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Impacts of Estimating Recharge on Groundwater Modeling for Arid Basins

Author : Janelle H. Huffman
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (123 download)

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Book Synopsis Impacts of Estimating Recharge on Groundwater Modeling for Arid Basins by : Janelle H. Huffman

Download or read book Impacts of Estimating Recharge on Groundwater Modeling for Arid Basins written by Janelle H. Huffman and published by . This book was released on 2005 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantifying recharge and spatially identifying recharge distribution is important for evaluating groundwater sustainability, especially in arid regions. A Guelph Permeameter helped identify specific recharge areas and the Soil Water Assessment Tool (SWAT) provided meaningful recharge rates used for modeling Wild Horse Basin in southwest Texas. SWAT generated recharge values that were subsequently used in two transient MODFLOW simulations: one with the recharge distributed according to sediment unit location (distributed zonation), and one with the recharge concentrated in cells adjacent to the mountain fronts surrounding the basin (mountain-front zonation). When comparing the model results to historic well hydrographs, mountain-front recharge appeared to improve calibration. A deterministic analytical model like SWAT is helpful in estimating recharge in arid basins and can create meaningful input parameters for numerical models like MODFLOW. MODFLOW was in turn able to evaluate SWAT recharge estimations for Wild Horse Basin using calibration and sensitivity analyses.

Anthropogenic Impacts on Recharge Processes and Water Quality in Basin Aquifers of the Desert Southwest

Author : Wendy Marie Robertson
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (889 download)

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Book Synopsis Anthropogenic Impacts on Recharge Processes and Water Quality in Basin Aquifers of the Desert Southwest by : Wendy Marie Robertson

Download or read book Anthropogenic Impacts on Recharge Processes and Water Quality in Basin Aquifers of the Desert Southwest written by Wendy Marie Robertson and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of natural grass/scrubland for agricultural use within the Trans-Pecos basins has altered recharge mechanisms and raised questions about groundwater sustainability. Past efforts focused on recharge in arid basin systems used three main assumptions: there is minimal modern recharge, no widespread recharge on basin floors, and no recharge from anthropogenic sources. However, in the Trans-Pecos, nitrate (NO3−) concentrations have increased in basin groundwater (up by 3-4 mg/l as NO3− in 40 yrs), refuting the "classic" model and posing water quality risks. Grazing and irrigated agriculture have impacted basin hydrology by altering vegetation regime and the magnitude and spatial distribution of infiltration. This has increased recharge, Cl-, and mobile N flux to basin groundwater. A series of spatially-distributed net infiltration models were used to estimate potential recharge from natural and anthropogenic sources. Between 7-20% of potential recharge results from widespread recharge on the basin floors. Additionally, from 1960-2000, irrigation return flow may have contributed 3.0 9 107 - 6.3 9 107 m3 of recharge. These results are supported by field observations. Cores collected beneath agricultural land document changes in water content and pore water chemistry that imply increased downward flux of moisture and solute, and NO3− and Cl- inventories beneath irrigated land are distinct in amount and profile from those in natural areas. There are significant implications for sustainability based upon the trends in groundwater NO3− concentrations, core results, and net infiltration models: more recharge may enter the basins than previously estimated and there is a potential long-term concern for water quality. Due to thick unsaturated zones in the basins, long travel times are anticipated. It is unknown if NO3− and Cl- flux has peaked or if effects will continue for years to come. Further study should be undertaken to examine anthropogenic impacts on basin water quality. Additionally, these impacts may occur in similar systems globally and there is considerable evidence for the re-evaluation of the validity of the "classic" model of recharge in arid basin systems. Future studies and management plans should incorporate potential impacts of changes in vegetation and land use on recharge processes and water budgets in arid basins.

Arid Lands Water Evaluation and Management

Author : Robert Maliva
Publisher : Springer Science & Business Media
ISBN 13 : 364229104X
Total Pages : 1068 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis Arid Lands Water Evaluation and Management by : Robert Maliva

Download or read book Arid Lands Water Evaluation and Management written by Robert Maliva and published by Springer Science & Business Media. This book was released on 2012-06-09 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large part of the global population lives in arid lands which have low rainfall and often lack the water required for sustainable population and economic growth. This book presents a comprehensive description of the hydrogeology and hydrologic processes at work in arid lands. It describes the techniques that can be used to assess and manage the water resources of these areas with an emphasis on groundwater resources, including recent advances in hydrologic evaluation and the differences between how aquifer systems behave in arid lands versus more humid areas. Water management techniques are described and summarized to show how a more comprehensive approach to water management is required in these areas, including the need to be aware of cultural sensitivities and conditions unique to many arid regions. The integration of existing resources with the addition of new water sources, such as desalination of brackish water and seawater, along with reusing treated wastewater, will be required to meet future water supply needs. Also, changing climatic conditions will force water management systems to be more robust so that future water supply demands can be met as droughts become more intense and rainfall events become more intense. A range of water management techniques are described and discussed in order to illustrate the methods for integrating these measures within the context of arid lands conditions.

Groundwater Recharge in a Desert Environment

Author : James F. Hogan
Publisher : American Geophysical Union
ISBN 13 :
Total Pages : 310 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Groundwater Recharge in a Desert Environment by : James F. Hogan

Download or read book Groundwater Recharge in a Desert Environment written by James F. Hogan and published by American Geophysical Union. This book was released on 2004-01-09 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Water Science and Application Series, Volume 9. Groundwater recharge, the flux of water across the water table, is arguably the most difficult component of the hydrologic cycle to measure. In arid and semiarid regions the problem is exacerbated by extremely small recharge fluxes that are highly variable in space and time. --from the Preface Groundwater Recharge in a Desert Environment: The Southwestern United States speaks to these issues by presenting new interpretations and research after more than two decades of discipline-wide study. Discussions ondeveloping environmental tracers to fingerprint sources and amounts of groundwater at the basin scalethe critical role of vegetation in hydroecological processesnew geophysical methods in quantifying channel rechargeapplying Geographical Information System (GIS) models to land surface processescoupling process-based vadose zone to groundwater modeling, and more make this book a significant resource for hydmlogists, biogeoscientists, and geochemists concerned with water and water-related issues in arid and semiarid regions.

Groundwater Recharge and Flow

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 030949964X
Total Pages : 72 pages
Book Rating : 4.3/5 (94 download)

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Book Synopsis Groundwater Recharge and Flow by : National Academies of Sciences, Engineering, and Medicine

Download or read book Groundwater Recharge and Flow written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2020-01-17 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water of appropriate quantity and quality is essential for drinking, sanitation, and food, energy, and industrial production for any society and is derived for most needs from surface- or groundwater sources. Studies suggest that groundwater use in irrigation globally is increasing in total volume as well as a percentage of all water used for irrigation, with the demand for groundwater resources increasing as available primary surface water supplies are depleted. Particularly in arid regions, groundwater may be the most accessible water supply for any purpose, leaving groundwater withdrawals concentrated in areas that are already experiencing water stress. Even in the presence of direct ground observations and measurements of the water table, quantitative evaluation of groundwater storage, flow, or recharge at different scales requires remotely sensed data and observations applied to groundwater models. Resolving the interaction of groundwater storage, flow, and recharge at a scale at which basins are managed requires remotely sensed data and proxy data. In June 2019, the Water Science and Technology Board of the National Academies of Sciences, Engineering, and Medicine convened a workshop to identify scientific and technological research frontiers in monitoring and modeling groundwater recharge and flow in various regions of the world. The goals of the workshop were to assess regional freshwater budgets under major use scenarios, including agriculture, industry, and municipal; examine state of the art research frontiers in characterizing groundwater aquifers, including residence time, quantity, flow, depletion, and recharge, using remotely sensed observations and proxy data; discuss groundwater model uncertainties and methods for mitigating them using sparse ground observations or data and other approaches; and consider our ability to detect which water management strategies that affect groundwater flow and recharge are being used and any changes in their use over time. This publication summarizes workshop presentations and plenary discussions.

Seasonality of Groundwater Recharge in the Basin and Range Province, Western North America

Author : Kirstin Lynn Neff
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Seasonality of Groundwater Recharge in the Basin and Range Province, Western North America by : Kirstin Lynn Neff

Download or read book Seasonality of Groundwater Recharge in the Basin and Range Province, Western North America written by Kirstin Lynn Neff and published by . This book was released on 2015 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alluvial groundwater systems are an important source of water for communities and biodiverse riparian corridors throughout the arid and semi-arid Basin and Range Geological Province of western North America. These aquifers and their attendant desert streams have been depleted to support a growing population, while projected climate change could lead to more extreme episodes of drought and precipitation in the future. The only source of replenishment to these aquifers is recharge. This dissertation builds upon previous work to characterize and quantify recharge in arid and semi-arid basins by characterizing the intra-annual seasonality of recharge across the Basin and Range Province, and considering how climate change might impact recharge seasonality and volume, as well as fragile riparian corridors that depend on these hydrologic processes. First, the seasonality of recharge in a basin in the sparsely-studied southern extent of the Basin and Range Province is determined using stable water isotopes of seasonal precipitation and groundwater, and geochemical signatures of groundwater and surface water. In northwestern Mexico in the southern reaches of the Basin and Range, recharge is dominated by winter precipitation (69% ± 42%) and occurs primarily in the uplands. Second, isotopically-based estimates of seasonal recharge fractions in basins across the region are compared to identify patterns in recharge seasonality, and used to evaluate a simple water budget-based model for estimating recharge seasonality, the normalized seasonal wetness index (NSWI). Winter precipitation makes up the majority of annual recharge throughout the region, and North American Monsoon (NAM) precipitation has a disproportionately weak impact on recharge. The NSWI does well in estimating recharge seasonality for basins in the northern Basin and Range, but less so in basins that experience NAM precipitation. Third, the seasonal variation in riparian and non-riparian vegetation greenness, represented by the normalized difference vegetation index (NDVI), is characterized in several of the study basins and climatic and hydrologic controls are identified. Temperature was the most significant driver of vegetation greenness, but precipitation and recharge seasonality played a significant role in some basins at some elevations. Major contributions of this work include a better understanding of recharge in a monsoon-dominated basin, the characterization of recharge seasonality at a regional scale, evaluation of an estimation method for recharge seasonality, and an interpretation of the interaction of seasonal hydrologic processes, vegetation dynamics, and climate change.

Estimation of Natural Groundwater Recharge

Author : I. Simmers
Publisher : Springer Science & Business Media
ISBN 13 : 9401577803
Total Pages : 503 pages
Book Rating : 4.4/5 (15 download)

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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.

Hydrogeology of Arid Environments

Author : Randolf Rausch
Publisher :
ISBN 13 : 9783443010706
Total Pages : 283 pages
Book Rating : 4.0/5 (17 download)

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Book Synopsis Hydrogeology of Arid Environments by : Randolf Rausch

Download or read book Hydrogeology of Arid Environments written by Randolf Rausch and published by . This book was released on 2012 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: In arid and semi-arid regions groundwater is often the only natural resource for water supply. Therefore, stakeholders face great challenges in managing this resource in a responsible way. The problem is further amplified by population growth, increase in agricultural, industrial and municipal water consumption, and the threat of climate change. Therefore, an optimal use and management of the scarce groundwater resources is imperative. A precondition for this is a sound understanding of the particularities of the hydrogeology of arid and semi-arid regions as well as a proper knowledge of the water budget, water resources in storage, and water quality. This book summarizes the results of the conference "Hydrogeology of Arid Environments", which was held in March 2012 in Hannover (Germany). It gives an overview about current research on this topic with examples from arid and semi-arid areas from all over the world. The book is intended for scientists, engineers, hydrologists, hydrogeologists, and political decision makers interested in the water resources of arid and semi-arid environments.

Climate Change and Groundwater

Author : Walter Dragoni
Publisher : Geological Society of London
ISBN 13 : 9781862392359
Total Pages : 200 pages
Book Rating : 4.3/5 (923 download)

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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.

Groundwater Modelling in Arid and Semi-Arid Areas

Author : Howard S. Wheater
Publisher : Cambridge University Press
ISBN 13 : 1139489720
Total Pages : pages
Book Rating : 4.1/5 (394 download)

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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.

Estimating Groundwater Recharge and Dynamics in Arid Regions Using Environmental Tracers

Author : Jörg Rüedi
Publisher :
ISBN 13 :
Total Pages : 173 pages
Book Rating : 4.:/5 (791 download)

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Book Synopsis Estimating Groundwater Recharge and Dynamics in Arid Regions Using Environmental Tracers by : Jörg Rüedi

Download or read book Estimating Groundwater Recharge and Dynamics in Arid Regions Using Environmental Tracers written by Jörg Rüedi and published by . This book was released on 2002 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Impact of Human Activity on Groundwater Dynamics

Author : Hans Gehrels
Publisher :
ISBN 13 : 9781901502565
Total Pages : 394 pages
Book Rating : 4.5/5 (25 download)

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Book Synopsis Impact of Human Activity on Groundwater Dynamics by : Hans Gehrels

Download or read book Impact of Human Activity on Groundwater Dynamics written by Hans Gehrels and published by . This book was released on 2001 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of a water balance for the Atankwidi catchment, West Africa - A case study of groundwater recharge in a semi-arid climate

Author :
Publisher : Cuvillier Verlag
ISBN 13 : 3736918852
Total Pages : 184 pages
Book Rating : 4.7/5 (369 download)

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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.

Groundwater Recharge in a Desert Environment

Author :
Publisher : American Geophysical Union
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4./5 ( download)

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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:

Climate Change Effects on Groundwater Resources

Author : Holger Treidel
Publisher : CRC Press
ISBN 13 : 0203120760
Total Pages : 414 pages
Book Rating : 4.2/5 (31 download)

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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 414 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,

Global Scale Estimation of Diffuse Groundwater Recharge

Author : Petra Döll
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (118 download)

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Book Synopsis Global Scale Estimation of Diffuse Groundwater Recharge by : Petra Döll

Download or read book Global Scale Estimation of Diffuse Groundwater Recharge written by Petra Döll and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

ITJEMAST 10(10) 2019

Author :
Publisher : International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies
ISBN 13 :
Total Pages : pages
Book Rating : 4./5 ( download)

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Book Synopsis ITJEMAST 10(10) 2019 by :

Download or read book ITJEMAST 10(10) 2019 written by and published by International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies. This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies publishes a wide spectrum of research and technical articles as well as reviews, experiments, experiences, modelings, simulations, designs, and innovations from engineering, sciences, life sciences, and related disciplines as well as interdisciplinary/cross-disciplinary/multidisciplinary subjects. Original work is required. Article submitted must not be under consideration of other publishers for publications.