by Mary P. Anderson, Applied Groundwater Modeling Books available in PDF, EPUB, Mobi Format. Download Applied Groundwater Modeling books, This second edition is extensively revised throughout with expanded discussion of modeling fundamentals and coverage of advances in model calibration and uncertainty analysis that are revolutionizing the science of groundwater modeling. The text is intended for undergraduate and graduate level courses in applied groundwater modeling and as a comprehensive reference for environmental consultants and scientists/engineers in industry and governmental agencies. Explains how to formulate a conceptual model of a groundwater system and translate it into a numerical model Demonstrates how modeling concepts, including boundary conditions, are implemented in two groundwater flow codes-- MODFLOW (for finite differences) and FEFLOW (for finite elements) Discusses particle tracking methods and codes for flowpath analysis and advective transport of contaminants Summarizes parameter estimation and uncertainty analysis approaches using the code PEST to illustrate how concepts are implemented Discusses modeling ethics and preparation of the modeling report Includes Boxes that amplify and supplement topics covered in the text Each chapter presents lists of common modeling errors and problem sets that illustrate concepts
by W. Kinzelbach, Groundwater Modelling Books available in PDF, EPUB, Mobi Format. Download Groundwater Modelling books, With the growing concern about groundwater resources both with respect to quantity and quality, the need for groundwater modelling tools is increasing. Although there are a number of excellent introductions to the concepts of groundwater flow and pollution transport, the student or practising engineer wishing to develop a model and do practical work on the computer finds that there is still a gap between the understanding of concepts and the ability to handle the actual computations. A great deal of groundwater modelling software for personal computers and microcomputers has appeared recently, but taking these models from the shelf and applying them without a background on their capabilities often leads to disappointment and frustration. This book provides the reader with all necessary details to start modelling on his own. It gives a comprehensive introduction to the major techniques currently used in the modelling of groundwater flow and pollutant transport in groundwater. Both self-contained and comprehensive, it presents a wide variety of methods currently applied in the management, protection, and remediation of groundwater resources, which allows the reader to take the step from understanding the concepts to the ability to handle actual computations. All major techniques are illustrated by a total of 19 sample programs in BASIC which can be modified by the reader to suit his own need. The programs can be run directly on an Apple II+ or compatible personal computer, and with slight modifications, most can be transferred to other microcomputers with BASIC capability and at least 48K of central memory. The necessary modifications for running the programs on an IBM-PC are indicated in the appendix. Students and professionals in the fields of hydrogeology and civil and environmental engineering will find this to be an extremely useful book. Knowledge of the basic concepts of hydrogeology is assumed and, starting from that basis, the book will enable them to understand mathematical groundwater models and write computer programs of their own.
by William C. Walton, Designing Groundwater Models With Windows Books available in PDF, EPUB, Mobi Format. Download Designing Groundwater Models With Windows books, This book explains how to design a groundwater model using the accompanying customized DesignMod software. DesignMod does not require a digitizer, but instead uses the mouse and rich graphical features of the Windows environment. It enables the user to draw and redraw easily and quickly cross sections and plan views with site base map information, contour, and zonation pattern overlays. Discretization, aggregation, averaging, and approximation guidelines for designing groundwater models with DesignMod are provided as a handy reference. DesignMod also can be used to manipulate and view model database array files. Many exercises with step-by-step program operation documentation are provided for beginning and intermediate modelers.
by Jacques W. Delleur, The Handbook Of Groundwater Engineering Books available in PDF, EPUB, Mobi Format. Download The Handbook Of Groundwater Engineering books, Due to the increasing demand for adequate water supply caused by the augmenting global population, groundwater production has acquired a new importance. In many areas, surface waters are not available in sufficient quantity or quality. Thus, an increasing demand for groundwater has resulted. However, the residence of time of groundwater can be of the order of thousands of years while surface waters is of the order of days. Therefore, substantially more attention is warranted for transport processes and pollution remediation in groundwater than for surface waters. Similarly, pollution remediation problems in groundwater are generally complex. This excellent, timely resource covers the field of groundwater from an engineering perspective, comprehensively addressing the range of subjects related to subsurface hydrology. It provides a practical treatment of the flow of groundwater, the transport of substances, the construction of wells and well fields, the production of groundwater, and site characterization and remediation of groundwater pollution. No other reference specializes in groundwater engineering to such a broad range of subjects. Its use extends to: The engineer designing a well or well field The engineer designing or operating a landfill facility for municipal or hazardous wastes The hydrogeologist investigating a contaminant plume The engineer examining the remediation of a groundwater pollution problem The engineer or lawyer studying the laws and regulations related to groundwater quality The scientist analyzing the mechanics of solute transport The geohydrologist assessing the regional modeling of aquifers The geophysicist determining the characterization of an aquifer The cartographer mapping aquifer characteristics The practitioner planning a monitoring network
by Segun Adelana, Applied Groundwater Studies In Africa Books available in PDF, EPUB, Mobi Format. Download Applied Groundwater Studies In Africa books, Groundwater is Africa‘s most precious natural resource, providing reliable water supplies for many people. Further development of groundwater resources is fundamental to increasing access to safe water across the continent to meet coverage targets and reduce poverty. There is also an increasing interest in the use of groundwater for irrigated
by Vivian E Sovinsky, Comparing Groundwater Model Calibration Approaches Does An Optimized Model Better Reflect Reality When Both Flow And Transport Observations Are Applied Books available in PDF, EPUB, Mobi Format. Download Comparing Groundwater Model Calibration Approaches Does An Optimized Model Better Reflect Reality When Both Flow And Transport Observations Are Applied books, This research compares two approaches to the application of formal calibration methods to groundwater modeling: sequential and combined. There exists research, both theoretical work and field studies, that point to improved estimation of hydraulic parameters when multiple types of observations, flow and transport, are applied simultaneously. There also exist theories about why combined calibration might not be compatible with the differing mathematical basis of flow compared to transport. This research has taken a closer look at the mechanisms at work by comparing these approaches when the input parameters are known. Using stochastic methods instead of field data, the original input parameters are specified. A synthetic heterogeneous K field is simulated using SGeMS Sequential Gaussian Simulation. This K-field, derived zones of porosity and defined boundary conditions comprise the simulation of a large confined aquifer. Two sets of synthetic observations obtained from forward models MODFLOW and MODPATH, heads and travel times, guide the calibration. Applying PEST++, the sequential approach performs two calibrations: a flow calibration using heads followed by a transport calibration using travel times. Both sets of observations are applied simultaneously in a single calibration run in the combined approach. Comparing final parameter estimates of each approach to the initial synthetic reality values shows that better results were achieved for both hydraulic conductivity and porosity with the combined approach. However, the sequential approach performed well with results falling within one standard deviation of the true values.
Author: National Academies of Sciences, Engineering, and Medicine Publisher: National Academies Press ISBN: 030949964X Size: 32.31 MB Format: PDF Category : Science Languages : en Pages : 72 View: 6580 Download Book
by National Academies of Sciences, Engineering, and Medicine, Groundwater Recharge And Flow Books available in PDF, EPUB, Mobi Format. Download Groundwater Recharge And Flow books, 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.
by C. W. Fetter, Applied Hydrogeology Books available in PDF, EPUB, Mobi Format. Download Applied Hydrogeology books, Hydrogeology’s importance has grown to become an integral part not only of geology curricula, but also those in environmental science and engineering. Applied Hydrogeology serves all these students, presenting the subject’s fundamental concepts in addition to its importance in other disciplines. Fetter skillfully addresses both physical and chemical hydrogeology, highlighting problem solving throughout the book. Case studies, Excel-based projects, and working student versions of software used by groundwater professionals supplement the fourth edition’s insightful explanations and succinct solutions to real-world challenges. Each chapter concludes with example problems, a notation of symbols, and informative analysis. A glossary of hydrogeological terms adds significant value to this comprehensive text. Fetter’s accessible coverage prepares readers for success in their careers well beyond the classroom.
by Janmaizatulriah Jani, A Gis Based Method For Groundwater Modelling Books available in PDF, EPUB, Mobi Format. Download A Gis Based Method For Groundwater Modelling books, Groundwater is important and precious freshwater found under the earth's surface. Groundwater is used for human consumption: for drinking, farming and for maintaining surface water system (rivers) especially during low flow periods. For effective groundwater management, quantitative and qualitative status of groundwater is usually assessed using various groundwater models. These models (for example numerical models) are capable of modelling complex and heterogeneous groundwater conditions. However, due to the requirement of extensive and detailed ground water data, these models are not suitable to be applied in all groundwater systems (major and minor aquifers). Therefore, scientific studies in areas of insignificant groundwater resource (minor aquifers) have been underplayed. However, since all groundwater bodies are significantly important, a new groundwater model was developed in this study. GIS functionality was explored and a GIS-based groundwater model was developed using minimal and accessible input data. GIS was used to represent the subsurface geology particularly the aquifer system and to model groundwater flow. The first model, a GIS based geological model was tested by reconstructing the geology map for the Slea catchment, in the United Kingdom and thickness of the Lincolnshire Limestone aquifer was predicted. The advantage of this model is its capability in predicting an aquifer's thickness without referring to point data like those obtained from boreholes. Then, the second model that is based on topographical and groundwater resistance analysis was used to model natural ground water discharge. Although there is discrepancy between estimated and measured spring discharge, the model has confirmed the usefulness of using GIS tool in modelling groundwater exploring minimal input data and basic modelling procedures. The developed models were not a replacement for numerical groundwater models. However, they would be useful to screen ground water status especially in areas that lack ground water data.