Abstract
A solution for the hydrodynamic clean up of contaminated land with flow reversal has been developed using analytical and numerical methods. This paper presents the results of physical modelling of the clean up process and compares the data with the theoretical predictions. A series of one dimensional laboratory tests are described in which clean water was flushed through a site initially contaminated with sodium chloride. The effects of flow reversal and soil permeability on the clean up process are investigated. A centrifuge test of hydrodynamic clean up using flow reversal is also described. Prototype stress and permeability conditions are modelled enabling the simulation of the clean up of a large scale homogeneous site. The theorectical models produced fairly accurate predictions of the varying contaminant concentrations in the model tests.
