Abstract
This paper presents two case studies of post-dam removal sedimentation in the United States. Two similar 1D channel evolution simulation models were used: CCHE1D and CONCEPTS. The first case is the model validation and application of CCHE1D to assess morphological response to the Marmot Dam removal in the Sandy River, Oregon. Simulation results showed a persistent erosion of sediments from the reservoir over the 10-year period. To minimize morphological changes downstream of the dam site, the CCHE1D-based optimization model is applied to find the optimal sediment diversion from the dam site. The optimization results show that the optimal diversion rate can significantly reduce the bed elevation changes downstream, which can be used as a guideline for planning best dam decommissioning management. The second case is a CONCEPTS study of the sediment dynamics over a 37-year period after removal of the Plainwell and Otsego City Dams along the Kalamazoo River, Michigan. Removing the dams would increase sediment loads 12-fold by rapidly eroding the fine-grained sediments stored behind the Otsego City Dam. This case demonstrates a simulation approach to find a better planning of dam removal by using the prediction results for what-if scenarios.
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