one-dimensional pollutant transport model in natural rivers, with emphasis on the role of storage zones

rivers are one of the major resources of drinking and agriculture water, so accurate control and modeling of their water quality is essential for protection of human health and environment stability. transient storage zones have a great effect on contaminant transport, especially in small mountain streams. the main effects include temporary detainment of solute and decrease its concentration in downstream and indirect effect on sorption process of solutes at streambed. in this study a new and comprehensive model that merges numerical schemes with higher order accuracy (quick scheme), for modeling pollutant transport with transient storage zones and kinetic sorption in rivers with irregular cross sections at unsteady flow regime, is presented. the model results for a hypothetical example and two sets of real data and comparison of them with results of two common models, show that model have reasonable accuracy and high numerical stability. so presented model could be suggested as an appropriate alternative model for common present models, at many of contaminant transport studies in natural rivers and streams.