Download or read book Hydraulic Functions of Soils from Physical Experiments and Their Applications written by Chong-Guang Su and published by . This book was released on 1976 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Functions of Soils from Physical Experiments and Their Applications written by Charles Su and published by . This book was released on 1976 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based upon the Pearson Type VIII distribution function, a general retention function which relates the saturation to the capillary pressure in disturbed soils has been discovered. This simple and yet complete function has been shown to describe precisely the imbibition as well as the drainage branch of the retention curve. It is defined by four readily assessed parameters that either have physical significance themselves or may be used to determine some hydraulic properties of the soil. With the assumption that the Burdine integrals are adequate, a relative permeability function has been derived through the substitution of the retention function for the integrands in the Burdine integrals. The permeability function is expressed in terms of the incomplete Beta function ratio whose value may be conveniently found in some mathematical tables. Further, a general pore-size distribution function of soils has been obtained from the retention function. The derivation of the pore-size distribution function enables more rigorous examination and further exploration of the theories concerning water movement in partially saturated soils. In this respect, an explanation of the phenomenon of air entrapment during imbibition has been offered through an energy concept based upon the pore-size distribution function along with the retention function. Two criteria of affinity have been established for porous media. Media are said to be affine if their corresponding pore-size distribution parameters are identical. The scaling factor for the external dimension of the model has been chosen to be the capillary pressure head at the inflection. point of the retnetion curve, whose value is always finite. The effect of the pore-size distribution parameters upon the retention, permeability and diffusivity curves has been analyzed. The analysis shows the parameter governing the downward concavity of the retention curve is as important as that governing the upward concavity when it comes to computing the permeability values from the retention data. A new and simple apparatus and procedure for obtaining the retention data of soil water in the laboratory have been developed. The technique can expedite the acquisition of the data for either the drainage or the imbibition branch of the retention curve.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Pedotransfer Functions in Soil Hydrology written by Yakov Pachepsky and published by Elsevier. This book was released on 2004-12-30 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental and agricultural modeling and assessment have a multitude of uses for soil parameters governing retention and transport of water and chemicals in soils. These parameters are notorious for the difficulties and high labor costs involved in measuring them. Good estimates instead of direct measurements may be accurate enough for many applications. Pedotransfer functions provide such estimates by utilizing available soil survey information to translate data we have into data we need. This book is the first book on the topic. It provides the unique compendium of pedotransfer functions, summarizes the vast international experience in this field, and shows how the value of soil data can be increased by using them in pedotransfer functions to predict soil hydrologic and related properties. The book is a rich source of information crucial for environmental research and applications.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 1160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Water Interactions written by Shingo Iwata and published by CRC Press. This book was released on 2020-08-26 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emphasizing pioneering achievements, this work offers a clear and systematic description of various soil-water phenomena and their applications to soil problems such as water retention and the flux of water in soils and clays. This second edition contains material on the physical properties of adsorbed water, the application of fractal theory to solute and water flows in field soils, fingering research, and more.
Download or read book Physical Aspects of Soil Water and Salts in Ecosystems written by A. Hadas and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers collected in this book were given and discussed at the symposium on "Soil water physics and technology", which was held in Rehovot, Israel, from August 19th-September 4th, 1971. It was sponsored by the International Society of Soil Science (1.S.S.S.) through its Commissions I (soil physics) and VI (soil technology), and organized by the Israeli Soil Science Society. Thanks are due to the Editors for having assembled contributions and discussion remarks into a well-rounded, coherent book. The subjects covered in this book are the theoretical and practical aspects of the following topics: water movement in soils, soil-water interactions, evaporation from soil and plants, water requirements of crops, ion activity and migration in soils, soilwater management and salinity. In as much as these contributions were not solicited, they represent ideas and subjects considered important by the authors and debators. In science, one often finds a gap between basic research and practical application. If reading this book creates a feeling of an apparent lack of balance between theory and practice, this represents the state of our science today, and the thoughtful reader can and will recognize that much remains to be done. W. R. GARDNER T.]. MAR5HAL President, Commission I President, Commission VI 1.5.5.5.
Download or read book Applications of Soil Physics written by Daniel Hillel and published by . This book was released on 1980 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here is a comprehensive treatment of the rote of pore structure in the interpretation of experimental data and how pore structure affects model calculations. This volume shows the benefits to be gained from studying in porous media in terms of three factors. These are transport phenomena, interfacial effects, and pore structure. The book provides examples of these concepts in application.
Download or read book Modelling and Applications of Transport Phenomena in Porous Media written by Jacob Bear and published by Springer Science & Business Media. This book was released on 1991-11-30 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transport phenomenain porous media are encounteredin various disciplines, e. g. , civil engineering, chemical engineering, reservoir engineering, agricul tural engineering and soil science. In these disciplines, problems are en countered in which various extensive quantities, e. g. , mass and heat, are transported through a porous material domain. Often, the void space of the porous material contains two or three fluid phases, and the various ex tensive quantities are transported simultaneously through the multiphase system. In all these disciplines, decisions related to a system's development and its operation have to be made. To do so a tool is needed that will pro vide a forecast of the system's response to the implementation of proposed decisions. This response is expressed in the form of spatial and temporal distributions of the state variables that describe the system's behavior. Ex amples of such state variables are pressure, stress, strain, density, velocity, solute concentration, temperature, etc. , for each phase in the system, The tool that enables the required predictions is the model. A model may be defined as a simplified version of the real porous medium system and the transport phenomena that occur in it. Because the model is a sim plified version of the real system, no unique model exists for a given porous medium system. Different sets of simplifying assumptions, each suitable for a particular task, will result in different models.
Download or read book Physical Nonequilibrium in Soils written by H. Magdi Selim and published by CRC Press. This book was released on 2022-01-27 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physical Nonequilibrium in Soils provides cutting-edge knowledge on physical nonequilibrium phenomena in soils, offering unique insight into the complexity of our physical world. With 18 chapters comprising the book, topics cover soil properties fluid properties mechanistic models transfer function geostatistics fractal analysis cellular-automation fluids coupling of physical and chemical nonequilibrium models confirming and quantifying physical nonequilibrium in soils analytical solutions field-scale research environmental impacts.
Download or read book Application of Soil Physics in Environmental Analyses written by Wenceslau Geraldes Teixeira and published by Springer. This book was released on 2014-06-30 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance to preserve soil and water have is increasingly recognized. Agricultural practices and ecological trends both affect and are affected by soil physical properties. The more frequency of natural disasters, as landslides and thunderstorms addresses the importance to integrate soil characteristics in predictive models. Soil physics research has grown considerably specially in the use of innovative sensors, soil databases, and modeling techniques have been introduced into soil water relationship and environmental monitoring. Those advances are thoroughly dispersed in articles and conference proceedings In this volume, the authors will bring together the effectiveness of many new field and lab sensors and examine the current state-of-the-art in modeling and data analysis. It also includes innovative approaches and case studies in tropical soils. Future directions in soil physics research are given by key researchers in this discipline.
Download or read book Soil Water Dynamics written by Arthur W. Warrick and published by Oxford University Press. This book was released on 2003-02-13 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a rigorous mathematical development of soil water and contaminant flow in variably saturated and saturated soils. Analytical and numerical methods are balanced: computer programs, among them MathCad and Fortran, are presented, and more than 150 practice and discussion questions are included. Students are thus exposed not only to theory but also to an array of solutions techniques. Those using the book as a reference will appreciate the careful development of basic flow equations, the inclusion of solutions and methodology currently available only in journals and proceedings volumes, and the examples and calculations directly applicable to their own work.
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.
Download or read book Physical Nonequilibrium in Soils written by H. Magdi Selim and published by CRC Press. This book was released on 1998-06-01 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Physical Nonequilibrium in Soils provides cutting-edge knowledge on physical nonequilibrium phenomena in soils, offering unique insight into the complexity of our physical world. With 18 chapters comprising the book, topics cover soil properties fluid properties mechanistic models transfer function geostatistics fractal analysis cellular-automation fluids coupling of physical and chemical nonequilibrium models confirming and quantifying physical nonequilibrium in soils analytical solutions field-scale research environmental impacts.
Download or read book The Handbook of Groundwater Engineering Third Edition written by John H. Cushman and published by CRC Press. This book was released on 2016-11-25 with total page 1726 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition adds several new chapters and is thoroughly updated to include data on new topics such as hydraulic fracturing, CO2 sequestration, sustainable groundwater management, and more. Providing a complete treatment of the theory and practice of groundwater engineering, this new handbook also presents a current and detailed review of how to model the flow of water and the transport of contaminants both in the unsaturated and saturated zones, covers the protection of groundwater, and the remediation of contaminated groundwater.
Download or read book Soil Hydrology for a Sustainable Land Management written by Simone Di Prima and published by MDPI. This book was released on 2020-12-10 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil hydrology determines the water–soil–plant interactions in the Earth’s system because porous medium acts as an interface within the atmosphere and lithosphere; regulates main processes such as runoff discharge, aquifer recharge, movement of water, and solutes into the soil; and ultimately the amount of water retained and available for plants growth. Soil hydrology can be strongly affected by land management. Therefore, investigations aimed at assessing the impact of land management changes on soil hydrology are necessary, especially to optimize water resources. This Special Issue collects 12 original contributions addressing the state-of-the-art advances in soil hydrology for sustainable land management. These contributions cover a wide range of topics including (i) the effects of land use change, (ii) water use efficiency, (iii) erosion risk, (iv) solute transport, and (v) new methods and devices for improved characterization of soil physical and hydraulic properties. They include both field and laboratory experiments as well as modelling studies. Different spatial scales, i.e., from field to regional scales, and a wide range of geographic regions are also covered. The collection of these manuscripts presented in this Special Issue provides a relevant knowledge contribution for effective saving water resources and sustainable land management.
Download or read book Infiltration Measurements for Soil Hydraulic Characterization written by Rafael Angulo-Jaramillo and published by Springer. This book was released on 2016-06-29 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the main results of many contributions from researchers worldwide who have used the water infiltration process to characterize soil in the field. Determining soil hydrodynamic properties is essential to interpret and simulate the hydrological processes of economic and environmental interest. This book can be used as a guide to soil hydraulic characterization and in addition it gives a complete description of the treated techniques, including an outline of the most significant research results, with the main points that still needing development and improvement.
