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SPILLWAY DEFLECTORS AT BONNEVILLE. JOHN DAY AND McHARY DAMS ON COLUMBIA RIVER, OREGON-WASHINGTON, AND ICE HARBOR, LOWER MONUMENTAL AND LITTLE GOOSE DAMS OH SNAKE RIVER, WASHIMGTON
| 题名： | SPILLWAY DEFLECTORS AT BONNEVILLE. JOHN DAY AND McHARY DAMS ON COLUMBIA RIVER, OREGON-WASHINGTON, AND ICE HARBOR, LOWER MONUMENTAL AND LITTLE GOOSE DAMS OH SNAKE RIVER, WASHIMGTON |
| 关键词： | Bonneville Dam John Day Dam McNary Dam Ice Harbor Dam Lower Monumental Dam Little Goose Dam Nitrogen Supersaturation Spillway Deflector Columbia River Snake River |
| 摘要： | Highly aerated water flowing over the spillways and plunging into the deep stilling basins of dams Increases the nitrogen levels of the rivers to a supersaturated condition hazardous to migrating fish. The report presents data and results of model studies conducted in development of spillway deflectors for six projects on the lower Snake and Columbia Rivers. The deflectors prevent the plunging action and cause a more skinning-type flow near the surface of stilling basin resulting in reduced nitrogen saturation levels. The models were used to design the deflector geometries and to assist in evaluating their effect on fishway attraction flow near downstream fishway entrances at each project. Prototype measurements indicate that the deflectors have been effective in reducing nitrogen levels at the projects. |
| 报告类型： | 科技报告 |
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