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Modeling River Aquifer Interactions And Geologic Heterogeneity In An Alluvial Fan System Cosumnes River Ca
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Book Synopsis Modeling River-aquifer Interactions and Geologic Heterogeneity in an Alluvial Fan System, Cosumnes River, CA by : Jan Henrich Fleckenstein
Download or read book Modeling River-aquifer Interactions and Geologic Heterogeneity in an Alluvial Fan System, Cosumnes River, CA written by Jan Henrich Fleckenstein and published by . This book was released on 2004 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrogeologic Characterization and Groundwater Flow Model Analyses in Modesto, California by : Barbara Anne Dalgish
Download or read book Hydrogeologic Characterization and Groundwater Flow Model Analyses in Modesto, California written by Barbara Anne Dalgish and published by . This book was released on 2006 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Groundwater Resources and Management by : B.S. Paliwal
Download or read book Global Groundwater Resources and Management written by B.S. Paliwal and published by Scientific Publishers. This book was released on 2017-04-01 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book on “Global Groundwater Resources and Management” has been aimed at growing recognition of depleting world groundwater resources, their contamination, future requirement of the fast growing human population of the world and urgent need of a better groundwater resources management system. The issues are quite complex but now they have crossed all the political boundaries and have become a common cause. The biggest challenge before the scientific community is to integrate valuable scientific advances and technological progress to solve the issue based on holistic and effective sustainable groundwater management. The book comprises the selected papers presented from all over the world at the 33rd International Geological Congress, Oslo, Norway, August 6 -14. 2008. A referee system of high, international standard has been used to review all the papers thoroughly before accepting them for publication. Each paper has been reviewed by at least two internationally recognized subject experts. In many cases as many as 5 or 6 subject experts have been contacted for the review work for a single paper because a much delayed response from the first two reviewers. Fortunately, all of them have sent their review comments simultaneously but at a later date. The book is broadly divided into five sections dealing with key aspects of global groundwater resources and management 1. Groundwater Resources and Management 2. Hydogeological Conditions, Groundwater Assessment and Modeling 3. Hydrogeochemistry and Contamination of Groundwater Resources 4. Exploitation of Groundwater and its Recharge 5. Hazardous Groundwater Conditions In total 31 research papers from Argentina, Australia, Bangladesh, China, Finland, Greece, India, Italy, Mexico, Netherlands, Oman, Poland, Portugal, Russia, Serbia, Turkey and Uzbekistan were selected from the General Symposium: Hydrogeology of the 33rd I.G.C. Oslo-2008. Reviewers were from countries like Argentina, Bangladesh, China, Finland, Greece, India, Indonesia, Italy, Japan, Poland, Portugal, Russia, Serbia, Syria, Thailand, Turkey and Uzbekistan.
Book Synopsis Hydrogeologic Facies Characterization of an Alluvial Fan Near Fresno, California, Using Geophysical Techniques by :
Download or read book Hydrogeologic Facies Characterization of an Alluvial Fan Near Fresno, California, Using Geophysical Techniques written by and published by . This book was released on 1997 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2005 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Chalk River Nuclear Laboratories. Environmental Research Branch Publisher :Chalk River, Ont. : Environmental Research Branch, Chalk River Laboratories ISBN 13 :9780660158990 Total Pages :17 pages Book Rating :4.1/5 (589 download)
Book Synopsis A Two-phase Model of Aquifer Heterogeneity by : Chalk River Nuclear Laboratories. Environmental Research Branch
Download or read book A Two-phase Model of Aquifer Heterogeneity written by Chalk River Nuclear Laboratories. Environmental Research Branch and published by Chalk River, Ont. : Environmental Research Branch, Chalk River Laboratories. This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of Ground-Water Flow in the Mojave River Basin, California by : Alexandra D' Arnoux
Download or read book Simulation of Ground-Water Flow in the Mojave River Basin, California written by Alexandra D' Arnoux and published by Georlogical Survey. This book was released on 2001-12-31 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a numerical ground-water flow model of the Mojave River ground-water basin to help understand the relation between regional and floodplain aquifer systems and estimate effects of future stresses on the ground-water system.
Book Synopsis Improved Numerical Methods for Modeling River-Aquifer Interaction by :
Download or read book Improved Numerical Methods for Modeling River-Aquifer Interaction written by and published by . This book was released on 2008 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new option for Local Time-Stepping (LTS) was developed to use in conjunction with the multiple-refined-area grid capability of the U.S. Geological Survey's (USGS) groundwater modeling program, MODFLOW-LGR (MF-LGR). The LTS option allows each local, refined-area grid to simulate multiple stress periods within each stress period of a coarser, regional grid. This option is an alternative to the current method of MF-LGR whereby the refined grids are required to have the same stress period and time-step structure as the coarse grid. The MF-LGR method for simulating multiple-refined grids essentially defines each grid as a complete model, then for each coarse grid time-step, iteratively runs each model until the head and flux changes at the interfacing boundaries of the models are less than some specified tolerances. Use of the LTS option is illustrated in two hypothetical test cases consisting of a dual well pumping system and a hydraulically connected stream-aquifer system, and one field application. Each of the hypothetical test cases was simulated with multiple scenarios including an LTS scenario, which combined a monthly stress period for a coarse grid model with a daily stress period for a refined grid model. The other scenarios simulated various combinations of grid spacing and temporal refinement using standard MODFLOW model constructs. The field application simulated an irrigated corridor along the Lower Rio Grande River in New Mexico, with refinement of a small agricultural area in the irrigated corridor. The results from the LTS scenarios for the hypothetical test cases closely replicated the results from the true scenarios in the refined areas of interest. The head errors of the LTS scenarios were much smaller than from the other scenarios in relation to the true solution, and the run times for the LTS models were three to six times faster than the true models for the dual well and stream-aquifer test cases, respectively. The results of the field application show that better estimates of daily stream leakage can be made with the LTS simulation, thereby improving the efficiency of daily operations for an agricultural irrigation system. ACKNOWLEDGEMENTSThe authors appreciatively acknowledge support for Sue Tillery provided by Sandia National Laboratories' through a Campus Executive Laboratory Directed Research and Development (LDRD) research project. Funding for this study was provided by %3C???. S. Tillery is funded by Sandia National Laboratories' through an Excellence in Engineering Fellowship Laboratory> Directed Research and Development (LDRD) research project.
Book Synopsis Modeling Study of Groundwater and Surface Water Interaction Using High Resolution Integrated Model by : Yunjie Liu
Download or read book Modeling Study of Groundwater and Surface Water Interaction Using High Resolution Integrated Model written by Yunjie Liu and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The groundwater and surface water comprise a single source of water resources. Efficient and sustainable water resource management requires using groundwater and surface water conjunctively. Worldwide, many water shortage problems come from the fact that neither the timing nor the location of precipitation coincide with water demands. Climate change makes this problem even worse. For California particularly, the warming trend is shifting more precipitation to fall as rain rather than snow during winter season, thereby reducing snow pack in Sierra Nevada Mountains. In addition, snowmelt is occurring earlier in spring due to warmer temperatures, therefore reducing the availability of snowmelt water that contributes to stream flow and surface reservoirs during dry summer season. Climate projections also suggest that winter floods will become more frequent, as will hotter and drier summers. The imbalance in time of water distribution within a year (wet, dry season), and between years (wet, dry year), as well as extreme climate events (for example, 1997 California flood, 2012-2014 California mega drought), create great challenges for water resource management. It is especially true when climate change effect is expected to continue. This study evaluates winter floodplain inundation as a strategy of capturing and storing excess winter flood water beneath Central Valley floor to restore groundwater for local subsurface reservoir development. The parallel, variably saturated flow modeling code, ParFlow, is chosen to model the spatial and temporal patterns of surface water and groundwater interaction in heterogeneous subsurface under floodplain inundation at lower Cosumnes River floodplain. Particularly, the mechanics of groundwater and surface interaction in heterogeneous subsurface is investigated. Capturing and storing excess winter flood water for the development of local subsurface groundwater reservoir and its impact on water resource management is discussed. Results of this study show that groundwater and surface water interaction under floodplain inundation is controlled by the heterogeneity of subsurface, primarily the connectivity of heterogeneity, as well as flood water inundating dynamics. A local subsurface reservoir can be augmented through floodplain inundation practice. However, its role of mitigating climate change impact on water resource management on a long time frame needs further investigation.
Book Synopsis Developing a Geospatial Model for Analysis of a Dynamic, Heterogeneous Aquifer by : Stephanie S. Wong
Download or read book Developing a Geospatial Model for Analysis of a Dynamic, Heterogeneous Aquifer written by Stephanie S. Wong and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Brazos River Alluvium aquifer extends from Bosque County to Fort Bend County and is one of 21 minor aquifers in Texas. In the past, this aquifer has mainly served as a source of irrigation water. However, increasing demands for water, especially in the Waco area, has renewed interest in this under-utilized source of shallow groundwater. Shallow, unconfined aquifers such as the Brazos River Alluvium aquifer present unique management challenges due to their lithologic heterogeneity, fluctuating saturated thickness, and proximity to surface sources of contamination. In this study, a geospatial approach was used to compile and analyze various datasets to model aquifer thickness and available water in the northern reach of the Brazos River Alluvium aquifer.
Book Synopsis Statistic Inversion of Multi-zone Transition Probability Models for Aquifer Characterization in Alluvial Fans by :
Download or read book Statistic Inversion of Multi-zone Transition Probability Models for Aquifer Characterization in Alluvial Fans written by and published by . This book was released on 2015 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the heterogeneity arising from the complex architecture of sedimentary sequences in alluvial fans is challenging. This study develops a statistical inverse framework in a multi-zone transition probability approach for characterizing the heterogeneity in alluvial fans. An analytical solution of the transition probability matrix is used to define the statistical relationships among different hydrofacies and their mean lengths, integral scales, and volumetric proportions. A statistical inversion is conducted to identify the multi-zone transition probability models and estimate the optimal statistical parameters using the modified Gauss-Newton-Levenberg-Marquardt method. The Jacobian matrix is computed by the sensitivity equation method, which results in an accurate inverse solution with quantification of parameter uncertainty. We use the Chaobai River alluvial fan in the Beijing Plain, China, as an example for elucidating the methodology of alluvial fan characterization. The alluvial fan is divided into three sediment zones. In each zone, the explicit mathematical formulations of the transition probability models are constructed with optimized different integral scales and volumetric proportions. The hydrofacies distributions in the three zones are simulated sequentially by the multi-zone transition probability-based indicator simulations. Finally, the result of this study provides the heterogeneous structure of the alluvial fan for further study of flow and transport simulations.
Book Synopsis Inverse Modeling of Geological Heterogeneity for Goal-Oriented Aquifer Characterization by : Heather Marie Savoy
Download or read book Inverse Modeling of Geological Heterogeneity for Goal-Oriented Aquifer Characterization written by Heather Marie Savoy and published by . This book was released on 2005 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characterizing the spatial heterogeneity of aquifer properties, particularly hydraulic conductivity, is paramount in groundwater modeling when the transport and fate of contaminants need to be predicted. The field of geostatistics has focused on describing this heterogeneity with spatial random functions. The field of stochastic hydrogeology uses these functions to incorporate uncertainty about the subsurface in groundwater modeling predictions. Bayesian inference can update prior knowledge about the spatial patterns of the subsurface (e.g. plausible ranges of values) with a variety of information (e.g. direct measurements of hydraulic conductivity as well as indirect measurements such as water table drawdown at an observation well) in order to yield posterior knowledge. This dissertation focuses on expanding the tools for Bayesian inference of these spatial random functions. First, the development of open-source software tools for guiding users through the Bayesian inference process are described. There is an desktop application that implements the Method of Anchored Distributions and is referred to as MAD#. It is built in a modular fashion such that it can be coupled with any geostatistical software and any numerical modeling software. This modularity allows for a wide variety of spatial random functions and subsurface processes to be incorporated in the Bayesian inference process. There is also a R package, called anchoredDistr, that supplements the MAD# software. While the MAD# software handles the communication between the geostatistical software and the numerical modeling software, the anchoredDistr package provides more flexibility in analyzing the results from MAD#. Since R is an open-source statistical computing language, the anchoredDistr package allows users to take advantage of the plethora of statistical tools in R to calculate the posterior knowledge in the Bayesian process. Although MAD# provides a post-processing module to calculate this posterior knowledge, it does not provide all of the options that the R community can provide for modifications. Second, the expansion of which kinds of data and knowledge can be incorporated into the Bayesian process is explored. Incorporating time series (e.g. the drawdown of a water table from pumping over time) as indirect data in Bayesian inference poses a computational problem referred to as the `curse of dimensionality'. Since each additional measurement in time is correlated with the measurements before and after it, the calculation of probability distributions of these data become multi-dimensional. A synthetic case study incorporating drawdown time series in the Bayesian inference process is explored. A second form of information, conceptual models of geology, is also explored with a synthetic case study. Conceptual models of geology (e.g. a graphical representation of assumed geologic layering) can be described with images. There is a geostatistical technique called Multipoint Statistics that uses images as its input. The synthetic case study provides a proof-of-concept example in which the Bayesian inference process can infer conceptual models of geology using Multipoint statistics. Third, the issue of devising spatial models with realistic geology while constraining the complexity of the model is explored. An aquifer analog is used as the basis for an example. An aquifer analog is a data set with data of hydraulic properties at high spatial resolution, i.e. much higher than expected for ordinary field measurements. The aquifer analog used in this dissertation has ten soil types distributed in three-dimensional space. The objective posed is to predict the early arrival time of a contaminant traveling through the analog. Given this prediction goal, the task is to simplify the analog into a simplified structure without changing the prediction outcome. The purpose of this exercise is to take a goal-oriented approach to defining a parsimonious spatial model for describing this complex aquifer analog such that a geostatistical model can be inferred for this kind of geology in a computationally efficient manner. Ultimately, any uncertainty quantification regarding the spatial heterogeneity of subsurface properties has the goal of improving groundwater modeling prediction efforts. With the addition of freely available software tools, the ability to integrate more forms of information, and methodology for translating complex geological structures into parsimonious spatial models, the characterization of our groundwater resources improves.
Book Synopsis Groundwater Availability of the Central Valley Aquifer, California by : Claudia C. Faunt
Download or read book Groundwater Availability of the Central Valley Aquifer, California written by Claudia C. Faunt and published by Geological Survey. This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Riparian Areas by : National Research Council
Download or read book Riparian Areas written by National Research Council and published by National Academies Press. This book was released on 2002-10-10 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Clean Water Act (CWA) requires that wetlands be protected from degradation because of their important ecological functions including maintenance of high water quality and provision of fish and wildlife habitat. However, this protection generally does not encompass riparian areasâ€"the lands bordering rivers and lakesâ€"even though they often provide the same functions as wetlands. Growing recognition of the similarities in wetland and riparian area functioning and the differences in their legal protection led the NRC in 1999 to undertake a study of riparian areas, which has culminated in Riparian Areas: Functioning and Strategies for Management. The report is intended to heighten awareness of riparian areas commensurate with their ecological and societal values. The primary conclusion is that, because riparian areas perform a disproportionate number of biological and physical functions on a unit area basis, restoration of riparian functions along America's waterbodies should be a national goal.
Book Synopsis Unsaturated-zone Modeling by : R.A. Feddes
Download or read book Unsaturated-zone Modeling written by R.A. Feddes and published by Springer Science & Business Media. This book was released on 2004-10-11 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mankind has manipulated the quantity and quality of soil water for millennia. Food production was massively increased through fertilization, irrigation and drainage. But malpractice also caused degradation of immense areas of once fertile land, rendering it totally unproductive for many generations. In populated areas, the pollutant load ever more often exceeds the soil’s capacity for buffering and retention, and large volumes of potable groundwater have been polluted or are threatened to be polluted in the foreseeable future. In the past decades, the role of soil water in climate patterns has been recognized but not yet fully understood. The soil-science community responded to this diversity of issues by developing numerical models to simulate the behavior of water and solutes in soils. These models helped improve our understanding of unsaturated-zone processes and develop sustainable land-management practices. Aimed at professional soil scientists, soil-water modelers, irrigation engineers etc., this book discusses our progress in soil-water modeling. Top scientists present case studies, overviews and analyses of strengths, weaknesses, opportunities and threats related to soil-water modeling. The contributions cover a wide range of spatial scales, and discuss fundamental aspects of unsaturated-zone modeling as well as issues related to the application of models to real-world problems.
Book Synopsis Groundwater-surface Water Interaction by : Corinna Abesser
Download or read book Groundwater-surface Water Interaction written by Corinna Abesser and published by . This book was released on 2008 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected papers from a symposium on A new Focus on Integrated Analysis of Groundwater-Surface Water Systems, held during the International Union of Geodesy and Geophysics XXIV General Assembly in Perugia, Italy, 11-13 July 2007.
Book Synopsis Groundwater Depletion in the United States (1900?2008) by : Leonard F Konikow
Download or read book Groundwater Depletion in the United States (1900?2008) written by Leonard F Konikow and published by CreateSpace. This book was released on 2014-08-01 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A natural consequence of groundwater withdrawals is the removal of water from subsurface storage, but the overall rates and magnitude of groundwater depletion in the United States are not well characterized. This study evaluates long- term cumulative depletion volumes in 40 separate aquifers or areas and one land use category in the United States, bringing together information from the literature and from new analy- ses. Depletion is directly calculated using calibrated ground- water models, analytical approaches, or volumetric budget analyses for multiple aquifer systems. Estimated groundwater depletion in the United States during 1900-2008 totals approx- imately 1,000 cubic kilometers (km3). Furthermore, the rate of groundwater depletion has increased markedly since about 1950, with maximum rates occurring during the most recent period (2000-2008) when the depletion rate averaged almost 25 km3 per year (compared to 9.2 km3 per year averaged over the 1900-2008 timeframe).
