GROUNDWATER CONTAMINANT TRANSPORT INCLUDING ADSORPTION AND 1ST-ORDER DECAY

This study deals with the transport of a contaminant in groundwater. T he contaminant is subject to first order decay or linear adsorption. I ts displacement can be modeled by a random walk process in which parti cles are killed at exponentially distributed times. Dirichlet problems are derived for the rate and mean time at which contaminated particle s reach a particular part of the boundary of a certain domain. These D irichlet problems are solved asymptotically for two types of 2D-flow p atterns: flow parallel to the boundary of a domain and arbitrary flow towards a well in an aquifer.