Abstract
Abstract. A one-dimensional channel evolution simulation model (CCHE1D) is applied to assess morphological changes in a reach of the Sandy River, Oregon, USA, due to the Marmot Dam removal in 2007. Sediment transport model parameters (e.g. sediment transport capacity, bed roughness coefficient) were calibrated using observed bed changes after the dam removal. The validated model is then applied to assess long-term morphological changes in response to a 10-year hydrograph selected from historical storm water records. The long-term assessment of sedimentation gives a reasonable prediction of morphological changes, expanding erosion in reservoir and growing deposition immediately downstream of the dam site. This prediction result can be used for managing and planning river sedimentation after dam removal. A simulation-based optimization model is also applied to determine the optimal sediment release rates during dam-removal that will minimize the morphological changes in the downstream reaches.
Highlights
Dam removal projects in the United States are becoming increasingly common for river restoration purposes
Quick release of reservoir sediments by a complete dam removal may result in supercritical flow in the river reach near the knickpoint, or immediately downstream of the dam
The CCHE1D model is used to assess morphological changes resulting from the Marmot Dam removal in a reach of the Sandy River, Oregon
Summary
Dam removal projects in the United States are becoming increasingly common for river restoration purposes. A key challenge in modelling conditions during dam removal is to simultaneously simulate flow and sediment transport in reservoir and downstream reaches over very steep bed slopes. Ding et al (2013a) applied a 1-D river flow and sediment transport model, CCHE1D, to assess morphological changes in a reach of the Sandy River, Oregon, USA due to the removal of the Marmot Dam in October 2007.
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