Seepage in the Unsaturated Zone: A Reviewby David B. McWhorter, Colorado State Univ, Engineering, Research Cent, Fort Collins, CO, USA,
Abstract: This paper briefly reviews the procedures whereby the seepage rate, depth of penetration of nonreactive pollutants, and the depth of the wetting front can be calculated when the assumption of one-dimensional flow is justified. A discussion of the effects of macroscale and microscale stratification on lateral spreading is provided. The permeability in each macroscale layer tends toward a constant value dictated by the seepage rate and such layers do not greatly enhance the tendency for lateral spreading. In microscale layers the pressure tends toward a common value, resulting in disparate permeabilities in each layer. This, in turn, causes the permeability tensor to exhibit directional properties that are enhanced relative to those measured at saturation.
Subject Headings: Seepage | One-dimensional flow | Pollutants | Porous media flow | Fluid flow | Water pollution | Pore water | Material mechanics
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