Vadose Zone Hydrology
Vadose Zone Hydrology describes the elements of the physical processes most often encountered by hydrogeologists and ground-water engineers in their vadose zone projects. It illustrates the application of soil physics to practical problems relevant to the characterization and monitoring of the vadose zone. It includes an introduction to physical processes, including basic flow theory, and provides examples of important field-scale processes that must be recognizable by hydrogeologists. Considerable attention is given to the concepts of recharge, including how it is most accurately evaluated in the vadose zone. Field and laboratory methods for characterizing hydraulic properties in the vadose zone are also covered, and case studies illustrating these methods are provided. New and emerging technologies for monitoring the vadose zone, particularly for the purpose of detecting contaminants, are highlighted. In the last section of the book, additional case studies are presented, demonstrating applications related to seepage detection, landfill monitoring, and soil gas investigations.
This book is written from the perspective of hydrogeologists and is designed to be directly applicable and to maintain continuity and consistency between chapters. It will be an invaluable primer for environmental or geotechnical consultants, regulators, or students who have no prior formal academic training in unsaturated flow concepts. Because the text contains some of the latest advances in this field, it will be an excellent reference for geologists and engineers currently working on problems of vadose zone hydrology.
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access tubes advection air-entry applied aquifer atmospheric basin borehole borehole permeameter calculated calibration capillary ceramic chemical chloride clay coefficient components compute concentration constant contaminants Darcy's equation decreases density depth determine Dimensionless drainage electrical resistance equilibrium evapotranspiration field capacity Figure flow fluid flux groundwater horizontal hydraulic gradient hydraulic head hydraulic properties increases infiltration rate installation laboratory land surface layer lysimeter macropores matric potential measured method migration moisture content moisture retention neutron probe obtained occur parameters perched percolation permeability permission phase ponding pore liquid porous cup precipitation pressure head relative retention curve Richards equation sand saturated seepage sensor soil gas soil texture soil water soil-water characteristic curve soil-water potential specific moisture capacity Stephens temperature tensiometer tension transport tritium unsaturated hydraulic conductivity vacuum vadose zone vadose zone monitoring vapor variability velocity vertical water content water table wetting front
Page 318 - Elrick. 1986. A method for simultaneous in situ measurement in the vadose zone of field-saturated hydraulic conductivity, sorptivity and the conductivity-pressure head relationship.
Page 318 - Methods for solving problems of multidimensional, partially saturated steady flow in soils...
Page 307 - Laboratory Research Program to Aid in Developing and Testing the Validity of Conceptual Models for Flow and Transport Through Unsaturated Porous Media," Proceedings of the Geoval-90 Symposium, May 14-20, 1990, Stockholm, Sweden (SNL paper SAND89-2359C) (1989).
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