| Abstract: | A practical approach to modeling the hydraulic interaction of a stream and aquifer via streambed leakage is based on the established U.S. Geological Survey (USGS) model, MODFLOW. To represent flood-wave propagation and the associated bank storage, MODFLOW‘s STREAM module is replaced by the Muskingum-Cunge diffusive-wave-routing scheme. The diffusive wave model closely approximates a dynamic model of a flood wave‘s speed, shape, and streambed leakage. Because the stream responds more rapidly to disturbances than the aquifer, streambed leakage is calculated at the flood routing time scale in order to properly represent the stream-aquifer coupling. However, both the relative magnitude and timing of aquifer response to a flood wave depend on the strength of this coupling. We find discrepancies in both the flood wave and the streambed leakage when the wave and ground-water motions are evaluated at different time scales. These discrepancies are significant in the case of a strong stream-aquifer coupling, for which equal aquifer and flood-routing time steps may be required. Wave diffusion and bank storage are shown to be comparable in magnitude and should, therefore, be included in stream-aquifer interaction models. Diffusive wave routing more accurately represents wave propagation, bed leakage, and aquifer response if short aquifer time steps are taken, and is preferable to the STREAM module for simulating short time transients. However, the STREAM module is useful for simulating large time frames if accurate modeling of the flood-wave propagation is not required. |
| Genre: | Article |
| ProdID: | 70018675 |
| Citation Author: | Perkins, S. P.; Koussis, A. D. |
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| Citation End Page: | 218 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Hydraulic Engineering |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Stream-aquifer interaction model with diffusive wave routing; 1996; Article; Journal; Journal of Hydraulic Engineering; Perkins, S. P.; Koussis, A. D. |
| Citation Start Page: | 210 |
| Citation Volume: | 122 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Stream-aquifer interaction model with diffusive wave routing; 1996; Article; Journal; Journal of Hydraulic Engineering; Perkins, S. P.; Koussis, A. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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