Stream-Aquifer Interaction Model with Diffusive Wave Routing

摘要: A practical approach to modeling the hydraulic interaction of a stream and aquifer via streambed leakage is based on established U.S. Geological Survey (USGS) model, MODFLOW. To represent flood-wave propagation associated bank storage, MODFLOW’s STREAM module replaced by Muskingum-Cunge diffusive-wave-routing scheme. The diffusive wave model closely approximates dynamic flood wave’s speed, shape, leakage. Because responds more rapidly disturbances than aquifer, calculated at routing time scale in order properly stream-aquifer coupling. However, both relative magnitude timing response depend strength this We find discrepancies when ground-water motions are evaluated different scales. These significant case strong coupling, for which equal flood-routing steps may be required. Wave diffusion storage shown comparable should, therefore, included models. Diffusive accurately represents propagation, bed leakage, if short taken, preferable simulating transients. useful large frames accurate not