Download or read book Hydrologic Mechanisms Governing Fluid Flow in Partially Saturated Fractured Porous Tuff at Yucca Mountain written by and published by . This book was released on 1984 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In contrast to the saturated zone where fluid moves rapidly along fractures, the fractures (with apertures large relative to the size of matrix pores) will desaturate first during drainage process and the bulk of fluid flow would be through interconnected pores in the matrix. Within a partially drained fracture, the presence of a relatively continuous air phase will produce practically an infinite resistance to liquid flow in the direction parallel to the fracture. The residual liquid will be held by capillary force in regions around fracture contact areas where the apertures are small. Normal to the fracture surfaces, the drained portion of the fractures will reduce the effective area for liquid flow from one matrix block to another matrix block. A general statistical theory is constructed for flow along the fracture and for flow between the matrix blocks to the fractures under partially saturated conditions. Results are obtained from an aperture distribution model for fracture saturation, hydraulic conductivity, and effective matrix-fracture flow areas as functions of pressure. Drainage from a fractured tuff column is simulated. The parameters for the simulations are deduced from fracture surface characteristics, spacings and orientations based on core analyses, and from matrix characteristics curve based on laboratory measurements. From the cases simulated for the fractured, porous column with discrete vertical and horizontal fractures and porous matrix blocks explicitly taken into account, it is observed that the highly transient changes from fully saturated conditions to partially saturated conditions are extremely sensitive to the fracture properties. However, the quasi-steady changes of the fluid flow of a partially saturated, fractured, porous system could be approximately simulated without taking the fractures into account. 22 references, 16 figures.
Download or read book Hydrologic Mechanisms Governing Fluid Flow in Partially Saturated Fractured Porous Tuff at Yucca Mountain written by and published by . This book was released on 1984 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In contrast to the saturated zone where fluid moves rapidly along fractures, the fractures (with apertures large relative to the size of matrix pores) will desaturate first during drainage process and the bulk of fluid flow would be through interconnected pores in the matrix. Within a partially drained fracture, the presence of a relatively continuous air phase will produce practically an infinite resistance to liquid flow in the direction parallel to the fracture. The residual liquid will be held by capillary force in regions around fracture contact areas where the apertures are small. Normal to the fracture surfaces, the drained portion of the fractures will reduce the effective area for liquid flow from one matrix block to another matrix block. A general statistical theory is constructed for flow along the fracture and for flow between the matrix blocks to the fractures under partially saturated conditions. Results are obtained from an aperture distribution model for fracture saturation, hydraulic conductivity, and effective matrix-fracture flow areas as functions of pressure. Drainage from a fractured tuff column is simulated. The parameters for the simulations are deduced from fracture surface characteristics, spacings and orientations based on core analyses, and from matrix characteristics curve based on laboratory measurements. From the cases simulated for the fractured, porous column with discrete vertical and horizontal fractures and porous matrix blocks explicitly taken into account, it is observed that the highly transient changes from fully saturated conditions to partially saturated conditions are extremely sensitive to the fracture properties. However, the quasi-steady changes of the fluid flow of a partially saturated, fractured, porous system could be approximately simulated without taking the fractures into account. 22 references, 16 figures.
Download or read book Flow and Contaminant Transport in Fractured Rock written by Jacob Bear and published by Academic Press. This book was released on 2012-12-02 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past two or three decades, fractured rock domains have received increasing attention not only in reservoir engineering and hydrology, but also in connection with geological isolation of radioactive waste. Locations in both the saturated and unsaturated zones have been under consideration because such repositories are sources of heat and potential sources of groundwater contamination. Thus, in addition to the transport of mass of fluid phases in single and multiphase flow, the issues of heat transport and mass transport of components have to be addressed.
Download or read book Identification and Characterization of Hydrologic Properties of Fractured Tuff Using Hydraulic and Tracer Tests test Well USW H 4 Yucca Mountain Nye County Nevada written by J. R. Erickson and published by . This book was released on 1985 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1985 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Burying Uncertainty written by K. S. Shrader-Frechette and published by Univ of California Press. This book was released on 1993-12-03 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shrader-Frechette looks at current U.S. government policy regarding the nation's high-level radioactive waste both scientifically and ethically. What should be done with our nation's high-level radioactive waste, which will remain hazardous for thousands of years? This is one of the most pressing problems faced by the nuclear power industry, and current U.S. government policy is to bury "radwastes" in specially designed deep repositories. K. S. Shrader-Frechette argues that this policy is profoundly misguided on both scientific and ethical grounds. Scientifically—because we cannot trust the precision of 10,000-year predictions that promise containment of the waste. Ethically—because geological disposal ignores the rights of present and future generations to equal treatment, due process, and free informed consent. Shrader-Frechette focuses her argument on the world's first proposed high-level radioactive waste facility at Yucca Mountain, Nevada. Analyzing a mass of technical literature, she demonstrates the weaknesses in the professional risk-assessors' arguments that claim the site is sufficiently safe for such a plan. We should postpone the question of geological disposal for at least a century and use monitored, retrievable, above-ground storage of the waste until then. Her message regarding radwaste is clear: what you can't see can hurt you.
Download or read book Tainted written by Kristin Sharon Shrader-Frechette and published by Environmental Ethics and Scien. This book was released on 2014 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-fourths of scientific research in the United States is funded by special interests. Many of these groups have specific practical goals, such as developing pharmaceuticals or establishing that a pollutant causes only minimal harm. Kristin Shrader-Frechette uses the analytical tools of classic philosophy of science to evaluate the conclusions of science tainted by the influence of special interests. She challenges accepted scientific findings regarding risks such as chemical toxins and carcinogens, ionizing radiation, pesticides, hazardous-waste disposal, development of environmentally sensitive lands, threats to endangered species, and inadequate standards for workplace-pollution exposure.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water resources Investigations Report written by and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook for Environmental Risk Decision Making written by C. Richard Cothern and published by CRC Press. This book was released on 2019-07-17 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook describes the broad aspects of risk management involving scientific policy judgment, uncertainty analysis, perception considerations, statistical insights, and strategic thinking. This book presents all the important concepts to enable the reader to "see the big picture." This ability is extremely important - it allows the decision maker or strategic environmental planner to understand and cope with a wide variety of complex and interlinked pieces of information and data. The text presents environmental problems and, whenever applicable, the methodology required to reach a successful solution. Decisions and policies are examined. The book covers numerous objective and subjective components of environmental risk decision making. It details quantitative and comparative risk, and investigates the cost and feasibility of different decisions. Social pressures, safety, and political, religious, ethical, and psychological issues are addressed. How to evaluate the potential impact on the quality of life also is discussed. Any company doing risk assessment, risk management, or risk communication, as well as those doing environmental decision making will find this reference to be invaluable. It is also suitable as a text for courses in environmental management, environmental science, and risk assessment in the areas of risk management and strategic environmental planning.
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.
Download or read book Identification and Compilation of Unsaturated vadose Zone Models written by Paul Van der Heijde and published by . This book was released on 1994 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flow and Transport Through Unsaturated Fractured Rock written by Daniel D. Evans and published by American Geophysical Union. This book was released on 2001-01-09 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 42. This monograph is an update and revision of the first edition, Geophysical Monograph 42, on ground-water flow and transport through unsaturated, fractured rock, published by AGU in 1987. The first edition evolved from a special symposium held during the American Geophysical Union fall meetings in San Francisco in December 1986. Invited and contributed papers at that AGU session, as well as panel presentations, focused on conceptualizing, measuring and modeling flow and transport through unsaturated fractured rock. As noted in the preface to the first edition, "the expanded interest in the topic (water flow and contaminant transport through unsaturated fractured rock) was initiated when the U.S. Geological Survey proposed that deep unsaturated zones in arid regions be considered in the site selection for the first high-level, commercially generated radioactive waste repository." Much of the research reported in that first edition was motivated by the U.S. Department of Energy's program to investigate Yucca Mountain at the Nevada Test Site as a possible geologic repository for commercially generated, high-level radioactive waste. As noted in the overview paper of the first edition, "characterization methods and modeling are in their developmental stage with the greatest lack of knowledge being the interaction between fracture and matrix flow and transport properties." Although the first edition of this monograph reflected the state-of-the science, laboratory and field experimental programs were novel and limited and, in general, followed from the principles and methods developed in the soil science community.
Download or read book Numerical Simulation of Air and Water flow Experiments in a Block of Variably Saturated Fractured Tuff from Yucca Mountain Nevada written by and published by . This book was released on 1998 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Flow and Transport Through Unsaturated Fractured Rock written by Daniel D. Evans and published by American Geophysical Union. This book was released on 1987 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
