Modeling Surface-Water Flow and Sediment Mobility with the Multi-Dimensional Surface-Water Modeling System (MD

U.S. GEOLOGICAL SURVEY

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Figure 4. Model solutions for the Snake River sediment-mobility model. The topography and velocity vectors for three discharges of (a) 200, (b) 425, and (c) 700 m³/s show the increasing magnitude and inundation of the island in the center of the channel. In general, the flow rate in the back-bar channel to the left of the island is slower than the main channel. The transport strength for each of the three discharges is shown in d-f respectively. At increasing discharge, flow rates are sufficient to mobilize coarse sediments in a larger area of the backbar channel. The highest discharge (700 m³/s) is necessary to remove coarse sediments and maintain flow in the backbar channel.

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