Download or read book The Measurement and Estimation of Saturated Soil Hydraulic Conductivity written by John M. Hollis and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring Saturated Hydraulic Conductivity of Soils written by American Society of Agricultural Engineers. Soil and Water Division. DrainageResearch Committee and published by . This book was released on 1962 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring Saturated Hydraulic Conductivity of Soils written by American Society of Agricultural Engineers. Drainage Research Committee and published by . This book was released on 1962 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measuring Hydraulic Conductivity for Use in Soil Survey written by Janneke J. Bouma and published by . This book was released on 1982 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Measuring Saturated Hydraulic Conductivity of Soils Classic Reprint written by Society Of Agricultural Engineers and published by Forgotten Books. This book was released on 2018-02-27 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Measuring Saturated Hydraulic Conductivity of Soils Unfortunately, the choice between methods is seldom black or white, and at the present state of technology there still is much disagreement between experts on the relative merits of many of the methods. Hence this compilation is not to be interpreted as a definitive evaluation, or even a tentative standard. Rather, it should be used as an introduction to the methods available and in common use, with some hints as to their pitfalls and limitations. The serious worker can then turn to the literature references for details on that method which most likely will suit sis needs. The project was initiated with G. O. Schwab as chairman. Cor respondence and personal contact with numerous persons, both mem bers and nonmembers of asae, have contributed to the material here presented.2. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Soil Physical Measurement and Interpretation for Land Evaluation written by Keppel Coughlan and published by CSIRO PUBLISHING. This book was released on 2002-11-26 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil physical measurements are essential for solving many natural resource management problems. This operational laboratory and field handbook provides, for the first time, a standard set of methods that are cost-effective and well suited to land resource survey. It provides: *practical guidelines on the soil physical measurements across a range of soils, climates and land uses; *straightforward descriptions for each method (including common pitfalls) that can be applied by people with a rudimentary knowledge of soil physics, and *guidelines on the interpretation of results and integration with land resource assessment. Soil Physical Measurement And Interpretation for Land Evaluation begins with an introduction to land evaluation and then outlines procedures for field sampling. Twenty detailed chapters cover pore space relations, water retention, hydraulic conductivity, water table depth, dispersion, aggregation, particle size, shrinkage, Atterburg limits and strength. The book includes procedures for estimating soil physical properties from more readily available data and shows how soil physical data can be integrated into land planning and management decisions.
Download or read book The Variability and Estimation of Hydraulic Conductivity in C Horizons of Sandy Loam Glacial Till Soils Comparison of One step Outflow Laboratory Method to an I n S i t u Method for Measuring Hydraulic Conductivity written by Dan B. Jaynes and published by . This book was released on 1978 with total page 236 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 Measuring Saturated Hydraulic Conductivity of Soils written by American Society of Agricultural Engineers. Drainage Research Committee. Soil and Water Division and published by . This book was released on 1962 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Standard Guideline for Fitting Saturated Hydraulic Conductivity Using Probability Density Functions ASCE EWRI 50 08 written by American Society of Civil Engineers and published by Amer Society of Civil Engineers. This book was released on 2008 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: ASCE/EWRI Standard 50-08 provides current guidelines for fitting saturated hydraulic conductivity using probability density functions. Standard ASCE/EWRI 51-08 addresses the calculation of effective saturated hydraulic conductivity (Ke or Kew) in local-scale groundwater flow, whether or not it is isotropic. Both Standards are bound in the same volume. These are the first in an anticipated series of standards that will address the knowledge of probabilistic characterization and behavior of saturated groundwater conductivity. Saturated hydraulic conductivity is critical in effectively and accurately measuring groundwater flow and transport of contaminants. All saturated hydraulic conductivity measurements are subject to variability even in the most geologically homogeneous aquifers caused by local fluctuations in an aquifer s textural characteristics. Averages of these fluctuations constitute a set of values that can be subsumed into a more general probabilistic description of the sample by means of a probability density function. Applying probabilistic procedures to the saturated hydraulic conductivity allows one to obtain the effective hydraulic conductivity, which can be used to estimate the average specific discharge, the average linear velocity, and other key variables in groundwater flow. The formulas in this publication must be written in the same units International Standard or U.S. These Standards will be useful to environmental engineers, water resources engineers, and anyone who uses hydraulics in engineering.
Download or read book Scaling Methods in Soil Physics written by Yakov Pachepsky and published by CRC Press. This book was released on 2003-03-26 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: The scaling issue remains one of the largest problems in soil science and hydrology. This book is a unique compendium of ideas, conceptual approaches, techniques, and methodologies for scaling soil physical properties. Scaling Methods in Soil Physics covers many methods of scaling that will be useful in helping scientists across a range of soil-rel
Download or read book Soil Characterization and Modeling of Spatial Distribution of Saturated Hydraulic Conductivity at Two Sites in the Volta Basin of Ghana written by Wilson Agyei Agyare and published by Cuvillier Verlag. This book was released on 2004 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the key parameters in hydrological and climate change modeling is a good estimation of the soil hydrauic properties in the region of interest. This study investigates the spatial distribution and variability of soil physical properties, with emphasis on saturated hydraulic conductivity at two pilot sites in the Volta Basin of Ghana. It focuses on the potential of pedotransfer functions (PTFs) and artificial neural network (ANN) approach for estimating saturated hydraulic conductivity. Saturated hydraulic conductivity was observed to be highly spatially variable; however, it can be estimated using selected PTFs and ANN for soils in the Volta Basin based on soil parameters that can readily be obtained from detailed soil maps--From cover.
Download or read book Hydraulic Conductivity written by Lakshmanan Elango and published by BoD – Books on Demand. This book was released on 2011-11-23 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are several books on broad aspects of hydrogeology, groundwater hydrology and geohydrology, which do not discuss in detail on the intrigues of hydraulic conductivity elaborately. However, this book on Hydraulic Conductivity presents comprehensive reviews of new measurements and numerical techniques for estimating hydraulic conductivity. This is achieved by the chapters written by various experts in this field of research into a number of clustered themes covering different aspects of hydraulic conductivity. The sections in the book are: Hydraulic conductivity and its importance, Hydraulic conductivity and plant systems, Determination by mathematical and laboratory methods, Determination by field techniques and Modelling and hydraulic conductivity. Each of these sections of the book includes chapters highlighting the salient aspects and most of these chapters explain the facts with the help of some case studies. Thus this book has a good mix of chapters dealing with various and vital aspects of hydraulic conductivity from various authors of different countries.
Download or read book Soil Science written by Sally D. Logsdon and published by ASA-CSSA-SSSA. This book was released on 2008 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Hydraulic Conductivity Based on HK hydro kinetic and EHK electro hydro kinetic Coupled Mechanisms written by Jinwon Kim and published by . This book was released on 2010 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this study is to develop new techniques to estimate the hydraulic conductivity of soils based on two coupled mechanisms. The first is the HK (Hydro-Kinetic) coupled mechanism formulated by Biot (1956 a, b). The second is the EHK (Electro-Hydro-Kinetic) coupled mechanism formulated by Pride (1994). Based on the HK coupled mechanism for dynamic behavior of soils, a characteristic frequency is a specific frequency at which the viscous coupling and inertial damping is about the same. Dynamic excitation causes the dynamic flow between solid particles and pore water; therefore, the characteristic frequency has information to estimate the hydraulic conductivity of saturated soils. In this experimental study, attenuation-based and velocity-based measurements are conducted to obtain the characteristic frequency using two sandy soils, (QUIKRETE and Ottawa sand) and two sand/bentonite mixtures (QUIKRETE sand/bentonite and Ottawa sand/bentonite mixture). From the saturated specimens, the distinct characteristic frequency is measured from the 1/Q versus frequency and the velocity versus frequency curves. The computed hydraulic conductivity based on Biot's (1956 a, b) simplified macroscopic equation using the acoustic techniques shows comparable results with the conventional laboratory test results. In addition to the HK coupled mechanism, a new method of dynamic measurement to estimate the hydraulic conductivity is studied using the EHK (Electro-Hydro-Kinetic) coupled mechanism. The potential of direct estimation of hydraulic conductivity using EHK was proposed by Pride (1994), Haartsen and Pride (1994), and Haartsen (1995). Using the dynamic impact force, the seismoelectric conversion is induced, which is measured by two electrodes. Using two sandy soils, (QUIKRETE and Ottawa sand), and five different soil mixtures, the relations between the general soil properties and amplitudes of the seismoelectric conversion are studied. Finally, a relation between the hydraulic conductivity and measured amplitudes of the seismoelectric conversion is compared to the theoretical predictions addressed by Pride (1994) and Haartsen (1995). Based on this study, the acoustic technique is a new tool for estimating the hydraulic conductivity of sandy and silt sandy soils. In addition, the EHK coupled mechanism proved to be a possible new testing method to measure dynamic soil properties.
Download or read book On The Measurement Of The Hydraulic Properties Of The Environmental Medium written by L. Pirouzian and published by . This book was released on 2002 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contaminates behave differently in the vadose zone than they do in the saturated zone and the governing equations for them are more involved. The hydraulic conductivity and porosity are the most important parameters affecting water and contaminates movements in the vadose and the saturated zones. To estimate these parameters certain methods are examined for measuring the hydraulic properties where the soil permeability is low and, where possible, the results are compared with measured data. Unsaturated hydraulic conductivity (UHC), unlike saturated hydraulic conductivity (SHC), is difficult to obtain especially for clayey soils and fractured rocks. Most available studies either overestimate or underestimate the UHC, especially for values close to the surface where the UHC values are several orders less than their corresponding values for SHC. The goal of this paper is to adjust and modify some empirical equations for obtaining UHC and compare the results with those already available in the literature. This is achieved through the use of non-linear least squares. Values that represent parameter b, in the Campbell's power function is allowed to vary in a given range instead of having a single value. For every value in this range the non-linear least squares equations is calculated and the b value with the smallest error term is picked to represent the empirical parameter for the Campbell's power function. Results indicate adjustment to the reported empirical parameter b is needed to minimize the sums of squares and to obtain a closer match between the measured and the experimental data. That is the sum of errors for the non-linear least squares between measured and empirical data is minimum somewhere near the values that they suggested. Therefore, for the clayey soil and fractured rocks the empirical parameters for the power function are modified to reflect the minimum sums of squares for non-linear least squares equation. To fine tune b further, non-linear least squares are used to find the best fitted value of b using the empirical equation that relates depth (h) to water content. We are in the process of classifying fractured rocks and are testing them to see how their hydraulic conductivity compares with clayey, sandy and silty soils. This is done through the application of fractal geometry and use of Sierpinski carpet. The empirical and the theoretical relationships used here are simple and practical and may directly be applied to obtain corresponding UHC. The equations that are utilized here are based on the theory or have their roots in statistical modeling. Results obtained from this investigation should be compared with the field data before they are applied toward solving Richards' equation.
