Modeling flow and transport in irrigation catchments 2. Spatial application of subcatchment model

Abstract

An alternative to spatial distribution is presented for physically based process modeling of catchment flow and solute transport. The approach is based on an integral relation for catchment streamflow which describes the accumulation through the stream network of the hillslope contributions. This relation is redefined from integration with respect to position along the stream to an integral that is with respect to the physical properties determining the hillslope flow and transport with probability distributions to represent the range of parameter values and areas associated with these. Since the integrand is now a relatively smooth function of the variables of integration, standard numerica..