Hydraulic alterations resulting from hydropower development in the Bonneville Reach of the Columbia River
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Abstract
We used a two-dimensional (2D) hydrodynamic model to simulate and compare the hydraulic characteristics in a 74-km reach of the Columbia River (the Bonneville Reach) before and after construction of Bonneville Dam. For hydrodynamic modeling, we created a bathymetric layer of the Bonneville Reach from single-beam and multi-beam echo-sounder surveys, digital elevation models, and navigation surveys. We calibrated the hydrodynamic model at 100 and 300 kcfs with a user-defined roughness layer, a variable-sized mesh, and a U.S. Army Corps of Engineers backwater curve. We verified the 2D model with acoustic Doppler current profiler (ADCP) data at 14 transects and three flows. The 2D model was 88% accurate for water depths, and 77% accurate for velocities. We verified a pre-dam 2D model run at 126 kcfs using pre-dam aerial photos from September 1935. Hydraulic simulations indicated that mean water depths in the Bonneville Reach increased by 34% following dam construction, while mean velocities decreased by 58%. There are numerous activities that would benefit from data output from the 2D model, including biological sampling, bioenergetics, and spatially explicit habitat modeling.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Hydraulic alterations resulting from hydropower development in the Bonneville Reach of the Columbia River |
| Series title | Northwest Science |
| DOI | 10.3955/046.084.0301 |
| Volume | 84 |
| Issue | 3 |
| Year Published | 2010 |
| Language | English |
| Publisher | Northwest Scientific Association |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 16 p. |
| First page | 207 |
| Last page | 222 |
| Country | United States |
| State | Oregon, Washington |
| Other Geospatial | Bonneville Reach |