Author(s): H. R. Safavi; A. Afshar; M. A. Marino
Linked Author(s): Hamid R. Safavi
Keywords: No Keywords
Abstract: Linking hydrodynamic and water quality models with different temporal and spatial scales may be considered as a challenge in simulating pollutant transport in surface and groundwater systems. In this paper, a quality-quantity simulation model for stream-aquifer interaction is developed which may be used in a large-scale system to study the long-term performance of such a system. Due to the scaling problem, the integrated model is of the coupled–uncoupled form, in which water quality modules are uncoupled. The stream subsystem is a one-dimensional, unsteady, and nonuniform subsystem in which a one-dimensional advection-dispersion equation is used to simulate pollutant transport. The groundwater subsystem is limited to the saturated zone, employing a three-dimensional unsteady flow equation with full advectiondispersion. To deal with the problem of differences in temporal (and spatial) scales, an adaptive mesh generation scheme is developed to manage the stability of the numerical scheme. An automatic mesh generation scheme is used in the vicinity of pollutant sources to satisfy convergence criteria. Due to lack of reliable field data in large basin scales and long time needed for laboratory experiments, the performance of the model is checked with hypothetical problem.
Year: 2009