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Waste generation and disposal; Soil composition; Wastes and contaminants; Soil-water interaction and relations; Contaminant-soil interaction; Soil permeability: characteristics and laboratory measurements; Evaluation of adsorption and diffusion; Contaminant transport modelling: solute transport; Contaminant transport modelling: transport of non-aqueous phase liquids.
This text addresses the scientific and engineering aspects of subsurface contaminant transport, analysis, and modeling as well as remediation in ground water. It offers a modern engineering approach to ground water contamination problems of the nineties and beyond.
Proceeding of a symposium on Contaminant transport in groundwater held in Stuttgart, April 1989. Topics covered include: Field methods & data processing; Field studies & tracer experiments; Contaminant chemistry & column experiments; Modelling of chemistry coupled to transport; Dispersion theory & transport in fractured media; Numerical aspects of modelling, parameter identification & optimization; Multiphase flow & transport in saturated soil.
The discovery of toxic pollution at Love Canal brought ground water contamination to the forefront of public attention. Since then, ground water science and modeling have become increasingly important in evaluating contamination, setting regulations, and resolving liability issues in court. A clearly written explanation of ground water processes and modeling, Ground Water Models focuses on the practical aspects of model application. It: examines the role of models in regulation, litigation, and policy development; explains ground water processes and describes specific applications for models; presents emerging technologies; and offers specific recommendations for better use of ground water science in policy formation.
Predicting the direction and rate of contaminant transport in the vadose zone requires quantification of soil hydraulic properties. For many problems, the most appropriate approach is to assume that the contamination is moving with the water phase. Therefore, the unsaturated hydraulic conductivity is the most important property governing water movement in soils. There is a wide variety of methods to determine this important property including in situ methods (e.g., instantaneous profile method, crust method), laboratory methods (e.g., one-step outflow, pressure plate, long column methods), and calculations from other data (e.g., Brooks and Corey, van Genuchten models). In this paper we present a summary and brief critique of the current methods for determining unsaturated hydraulic conductivity.