Numerical Simulation of Water Flow Through Unsaturated Soil in Vertical and Inclined Layered Systems

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ISBN 13 :
Total Pages : 249 pages
Book Rating : 4.:/5 (956 download)

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Book Synopsis Numerical Simulation of Water Flow Through Unsaturated Soil in Vertical and Inclined Layered Systems by : Jorge L. Rodriguez

Download or read book Numerical Simulation of Water Flow Through Unsaturated Soil in Vertical and Inclined Layered Systems written by Jorge L. Rodriguez and published by . This book was released on 2016 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: In past decades, there were discussions explaining the mechanisms and factors that influence water flow through soil in unsaturated conditions. This phenomenon is of major importance to the mining industry as water is one of the trigger mechanisms for Acid Rock Generation (ARD) generation. In 1999, Newman evaluated water flow in unsaturated conditions for two column experiments using a vertical layer system of sandy materials and waste rock from the Golden Sunlight mine. Later in 2009, Andrina analyzed water flow using waste rock from the Grasberg Mine in three Meso-scale experiments to understand flow mechanisms for incline layers of waste rock. The current study focuses on modeling the two column experiments by Newman and the three Meso-scale panels by Andrina to analyze the mechanisms controlling water flow in unsaturated soils. Additionally, one of the models is evaluated under three additional materials to compare the effect of different hydraulic properties in an inclined layering system. With finite element methods, the experiments are modeled and calculated under equal boundary conditions. The use of climate boundaries recreates the precipitation flux and head pressure boundary to generate the suction from the discharge points. The models are run using SvFlux software, which runs an automatic mesh refinement algorithm and solves the Partial Differential Equations (PDEs) using FlexPDE. The models are validated based on the correlation of the discharge volume from each experiment. The results from the models describe the profile changes of head pressure (hp), flux, flow paths, and matric suction to describe the mechanism of flow in the unsaturated conditions. The validation of the models was achieved through back analyzing the different tests in the experiments, due to the low correlation of the model using the laboratory properties and the experimental results. The back analysis of the material is focused on the air entry value, and the saturated hydraulic conductivity as a means to change the unsaturated flow. The result from the research displays similarities and disagreements between the models and experiments. The models showed that the measured discharge from a particular material does not represent the preferential flow path of water, as a small gradient in the pressure distribution can generate breakthrough at the base of the system.

Numerical Issues Arising in the Simulations of Transient Water Flow in Layered Unsaturated Soils

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ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Numerical Issues Arising in the Simulations of Transient Water Flow in Layered Unsaturated Soils by : Ruowen Liu

Download or read book Numerical Issues Arising in the Simulations of Transient Water Flow in Layered Unsaturated Soils written by Ruowen Liu and published by . This book was released on 2017 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The geotechnical community typically relies on recommendations made from numerical simulations. Commercial software exhibits (local) numerical instabilities in layered soils across soil interfaces. This research work investigates unsaturated moisture flow in layered soils and identifies a possible source of numerical instabilities across soil interfaces and potential improvement in numerical schemes for solving the Richards' equation. The numerical issue at soil interfaces is addressed by a (nonlinear) interface problem. A full analysis of the simplest soil hydraulic model, the Gardner model, identifies the conditions of ill-posedness of the interface problem. Numerical experiments on various (more advanced and practical) soil hydraulic models show that the interface problem can also be ill-posed under certain circumstances. Spurious numerical ponding and/or oscillations around soil interfaces are observed consequently. This work also investigates the impact of different averaging schemes for cell-centered conductivities on the propensity of ill-posedness of the interface problem and concludes that smaller averaging conductivities are more likely to trigger numerical instabilities. In addition, an agent-based stochastic soil model, with hydraulic properties defined at the finite difference cell level, results in a large number of interface problems. This research compares sequences of stochastic realizations in heterogeneous unsaturated soils with the numerical solution using homogenized soil parameters. The mean of stochastic realizations is not identical to the solution obtained from homogenized soil parameters.

Selected Water Resources Abstracts

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ISBN 13 :
Total Pages : 964 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Selected Water Resources Abstracts by :

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1989 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Numerical Model for the Simulation of Unsaturated Vertical Flow of Moisture in Soils

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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (63 download)

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Book Synopsis A Numerical Model for the Simulation of Unsaturated Vertical Flow of Moisture in Soils by : G. P. Wind

Download or read book A Numerical Model for the Simulation of Unsaturated Vertical Flow of Moisture in Soils written by G. P. Wind and published by . This book was released on 1975 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Numerical Simulation of the Effects of Low-permeability Valley-fill Barriers and the Redistribution of Ground-water Withdrawals in the Pearl Harbor Area, Oahu, Hawaii

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ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.3/5 (121 download)

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Book Synopsis Numerical Simulation of the Effects of Low-permeability Valley-fill Barriers and the Redistribution of Ground-water Withdrawals in the Pearl Harbor Area, Oahu, Hawaii by : Delwyn S. Oki

Download or read book Numerical Simulation of the Effects of Low-permeability Valley-fill Barriers and the Redistribution of Ground-water Withdrawals in the Pearl Harbor Area, Oahu, Hawaii written by Delwyn S. Oki and published by . This book was released on 2005 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Applied Mechanics Reviews

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ISBN 13 :
Total Pages : 1072 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Applied Mechanics Reviews by :

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1986 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Conceptual Models of Flow and Transport in the Fractured Vadose Zone

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Publisher : National Academies Press
ISBN 13 : 0309170990
Total Pages : 398 pages
Book Rating : 4.3/5 (91 download)

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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.

Groundwater Modelling in Arid and Semi-Arid Areas

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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.

Dissertation Abstracts International

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ISBN 13 :
Total Pages : 874 pages
Book Rating : 4.F/5 ( download)

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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 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Cities and Their Vital Systems

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Publisher : National Academies Press
ISBN 13 : 9780309037860
Total Pages : 1298 pages
Book Rating : 4.0/5 (378 download)

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Book Synopsis Cities and Their Vital Systems by : Advisory Committee on Technology and Society

Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.

Physico-Mechanical Properties and Treatment Technology of Hazardous Geomaterials, volume II

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Publisher : Frontiers Media SA
ISBN 13 : 2832541593
Total Pages : 206 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Physico-Mechanical Properties and Treatment Technology of Hazardous Geomaterials, volume II by : Xianze Cui

Download or read book Physico-Mechanical Properties and Treatment Technology of Hazardous Geomaterials, volume II written by Xianze Cui and published by Frontiers Media SA. This book was released on 2023-12-22 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Research Topic is Volume II of a series. The previous volume can be found here: Physico-Mechanical Properties and Treatment Technology of Hazardous Geomaterials New materials and technologies are emerging in every branch of geotechnical engineerings, such as high-speed railway subgrade, soil improvement and remediation, underground space structure, ground energy storage, energy pile, energy geostructure, energy tunnel, tunnel waterproof engineering, and marine engineering. In addition to the common infrastructure construction materials, it also includes the treatment of hazardous geomaterials, resource utilization of industrial wastes, geopolymer materials, contaminated soils related to geoenvironmental engineering as well as other newly developed materials. In recent years, the advancement of new materials has promoted the development of geotechnical engineering and its close intersection with other disciplines. Scholars have done fruitful work, but the understanding of many new materials is not very clear. Moreover, the external environment (e.g., heat, water, external force) borne by various materials is becoming more and more complex. The newly developed geotechnical materials involve the coupling actions of multiple fields such as physics, mechanics, chemistry and even biology. Some new technologies and specifications are still developing. For this purpose, it is necessary to investigate the mineral composition and micro-structures, physico-mechanical properties, deformation and strength evolution process, and constitutive characteristics of various geotechnical materials. The research methods include theoretical description, numerical simulation, laboratory experiments and field tests. The Research Topic aims to bring together Original Research and Review articles on the recent developments in natural geotechnical material improvement, hazardous geomaterials, synthetic materials, geopolymer, energy geotechnical materials and contaminated soil treatment.

Agrindex

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ISBN 13 :
Total Pages : 1014 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Agrindex by :

Download or read book Agrindex written by and published by . This book was released on 1994 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Grid Generation Methods

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Publisher : Springer Science & Business Media
ISBN 13 : 9048129125
Total Pages : 390 pages
Book Rating : 4.0/5 (481 download)

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Book Synopsis Grid Generation Methods by : Vladimir D. Liseikin

Download or read book Grid Generation Methods written by Vladimir D. Liseikin and published by Springer Science & Business Media. This book was released on 2009-10-27 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text is an introduction to methods of grid generation technology in scientific computing. Special attention is given to methods developed by the author for the treatment of singularly-perturbed equations, e.g. in modeling high Reynolds number flows. Functionals of conformality, orthogonality, energy and alignment are discussed.

Soil Physics with HYDRUS

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Publisher : CRC Press
ISBN 13 : 1420073818
Total Pages : 388 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Soil Physics with HYDRUS by : David E. Radcliffe

Download or read book Soil Physics with HYDRUS written by David E. Radcliffe and published by CRC Press. This book was released on 2018-10-03 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical models have become much more efficient, making their application to problems increasingly widespread. User-friendly interfaces make the setup of a model much easier and more intuitive while increased computer speed can solve difficult problems in a matter of minutes. Co-authored by the software’s creator, Dr. Jirka Šimůnek, Soil Physics with HYDRUS: Modeling and Applications demonstrates one- and two-dimensional simulations and computer animations of numerical models using the HYDRUS software. Classroom-tested at the University of Georgia by Dr. David Radcliffe, this volume includes numerous examples and homework problems. It provides students with access to the HYDRUS-1D program as well as the Rosetta Module, which contains large volumes of information on the hydraulic properties of soils. The authors use HYDRUS-1D for problems that demonstrate infiltration, evaporation, and percolation of water through soils of different textures and layered soils. They also use it to show heat flow and solute transport in these systems, including the effect of physical and chemical nonequilibrium conditions. The book includes examples of two-dimensional flow in fields, hillslopes, boreholes, and capillary fringes using HYDRUS (2D/3D). It demonstrates the use of two other software packages, RETC and STANMOD, that complement the HYDRUS series. Hands-on use of the windows-based codes has proven extremely effective when learning the principles of water and solute movement, even for users with very little direct knowledge of soil physics and related disciplines and with limited mathematical expertise. Suitable for teaching an undergraduate or lower level graduate course in soil physics or vadose zone hydrology, the text can also be used for self-study on how to use the HYDRUS models. With the information in this book, you can run models for different scenarios and with different parameters, and thus gain a better understanding of the physics of water flow and contaminant transport.

New Zealand Journal of Agricultural Research

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ISBN 13 :
Total Pages : 560 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis New Zealand Journal of Agricultural Research by :

Download or read book New Zealand Journal of Agricultural Research written by and published by . This book was released on 2009 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Unsaturated Soil Mechanics

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Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 614 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Unsaturated Soil Mechanics by : Ning Lu

Download or read book Unsaturated Soil Mechanics written by Ning Lu and published by John Wiley & Sons. This book was released on 2004-05-20 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsaturated Soil Mechanics is the first book to provide a comprehensive introduction to the fundamental principles of unsaturated soil mechanics. * Offers extensive sample problems with an accompanying solutions manual. * Brings together the rapid advances in research in unsaturated soil mechanics in one focused volume. * Covers advances in effective stress and suction and hydraulic conductivity measurement.

Mathematical Reviews

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ISBN 13 :
Total Pages : 1852 pages
Book Rating : 4.X/5 (6 download)

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Book Synopsis Mathematical Reviews by :

Download or read book Mathematical Reviews written by and published by . This book was released on 2005 with total page 1852 pages. Available in PDF, EPUB and Kindle. Book excerpt: