Reliability of Compacted Soil Liners

by Craig H. Benson, Univ of Texas, United States,
Randall J. Charbeneau, Univ of Texas, United States,
David E. Daniel, Univ of Texas, United States,



Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance

Abstract:

Determination of transport times of contaminants through a soil liner is hindered by the inherent spatial variability of the hydraulic conductivity of compacted soil. The existence of variability suggests a stochastic analysis to obtain estimates of transport times with associated probabilities of occurrence. This paper presents two different approaches to determine the time at which leachate first appears at the bottom of the liner (first-passage time). The effects of attenuation are ignored; transport of solutes in the leachate is assumed to occur by advection and, with the Chapman-Kolmogorov analysis, diffusion is considered.

Subject Headings: Compacted soils | Soil pollution | Linings | Contaminant transport | Hydraulic conductivity | Soil analysis | Stochastic processes | Leachates

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