Download or read book Field Measurement of Hydraulic Conductivity in Slowly Permeable Materials Using Early Time Infiltration Measurements in Unsaturated Media written by N. Baumgartner and published by . This book was released on 1994 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most procedures to measure the hydraulic conductivity of slowly permeable materials such as compacted soil liners are based on analyses that assume saturated, one-dimensional flow under steady-state conditions. The overwhelming problem, however, is the very long times, of the order of weeks or months in liner materials, to reach experimentally-measurable steady flow. A new field procedure is proposed for slowly permeable materials that takes advantage of the early transient flow in initially unsaturated soil. Both constant head and falling head techniques are proposed and measurement times are of the order of one half to several hours. The falling head technique has the advantage of requiring only the difference between the field-saturated and initial water contents in addition to the measured position of the falling head above the soil surface as a function of time. An experiment on the experimental soil liner at Champaign, Illinois, gave saturated hydraulic conductivity values using the constant head technique that were in good agreement with previously measured values. A laboratory test demonstrates the advantages of the falling head technique.

Download or read book Hydraulic Conductivity and Waste Contaminant Transport in Soil written by David Edwin Daniel and published by ASTM International. This book was released on 1994 with total page 617 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 Evaluation and Remediation of Low Permeability and Dual Porosity Environments written by Martin N. Sara and published by ASTM International. This book was released on 2002 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydromechanical and Thermohydromechanical Behaviour of Deep Argillaceous Rock Theory and Experiments written by N. Hoteit and published by CRC Press. This book was released on 2002-01-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: These papers address state-of-the-art knowledge of thermo-hydro-mechanical behaviours of deep argillaceous rocks. They introduce achievements in laboratory test methods for determining the coupling parameters of deep argillaceous rocks, amongst other things.

Download or read book Soil and Environmental Analysis written by Keith A. Smith and published by CRC Press. This book was released on 2000-10-12 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews a wide range of methods for soil physical analysis. Considers applications, accuracy, measurement time, and cost of equipment. Provides examples of applications.

Download or read book Environmental Mechanics written by P. A. C. Raats and published by . This book was released on 2002 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: CD-ROMs contain: John Philip's 1995 interview with Steve Burges --A recent address-in-print by Philip -- Bibliography of his work.

Download or read book Evaluation of Constant Head Infiltration Test Analysis Methods for Field Estimation of Saturated Hydraulic Conductivity of Compacted Clay Liners written by D. Cazaux and published by . This book was released on 2002 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field infiltration tests are commonly used to assess the hydraulic conductivity of low permeability materials such as natural clay barriers and compacted clay liners. The soils used for compacted clay liners are always partially saturated and require very long testing times to reach steady-state flow conditions. Consequently, because they are less time consuming, laboratory tests are usually preferred for construction quality control. Nevertheless, it is well-known that field tests are more representative of the clay liner because of the scale effect. This is why, since the 1980s, the main issues associated with field procedures have been studied and several methods proposed for testing low-permeability materials within short time periods. The proposed methods are based on early-time flow analysis in unsaturated conditions and have been applied to various compacted soils under field and laboratory conditions. To evaluate these methods, we carried out a comprehensive testing program using a hydraulic field infiltrometer method (sealed single-ring infiltrometer) and a laboratory rigid-wall permeameter method that reproduces surface field test conditions. The laboratory tests were continued until saturated hydraulic conductivity was obtained so that this value could be compared against the hydraulic conductivity estimated from early-time analysis on the same specimen. The obtained results show the influence of (a) the initial moisture content, (b) the sorptivity and hydraulic head on the early-time infiltration rate, and (c) the final estimated hydraulic conductivity. A comparison of analysis methods shows the limitations of some and tries to explain the reasons for such inadequacies in the description of early-time unsaturated flows. Nevertheless, the conclusions of our study show that conventional early-time analyses give a good estimation of saturated hydraulic conductivity within a short time period compatible with construction quality-control procedures.

Download or read book Vadose Zone Science and Technology Solutions written by Brian B. Looney and published by Collector Books. This book was released on 2000 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: CD contains the entire text of the book plus additional case studies.

Download or read book Measurement of Hydraulic Conductivity Distributions written by Fred J. Molz and published by . This book was released on 1990 with total page 74 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 Limitations of the Instantaneous Profile Method for Field Measurement of Unsaturated Hydraulic Conductivity written by Fred G. Baker and published by . This book was released on 197? with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field Measurement of Unsaturated Hydraulic Conductivity by Infiltration Through Artificial Crusts written by Janneke J. Bouma and published by . This book was released on 1971* with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Field Measurement of Unsaturated Hydraulic Conductivity by Infiltration Through Gypsum Crusts written by Janneke J. Bouma and published by . This book was released on 1972* with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Agronomy Abstracts written by and published by . This book was released on 1979 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annuaire de la Recherche written by and published by . This book was released on 1994 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: