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DWORSHAK DAM, NORTH FORK CLEAWATER RIVER, IDAHO Hydraulic Model Investigations
| 题名： | DWORSHAK DAM, NORTH FORK CLEAWATER RIVER, IDAHO Hydraulic Model Investigations |
| 关键词： | Hydraulic Models Dworshak Dam Spillways Cavitation Regulating Conduits Eccentric-Trunnion Regulating Valve Aeration Deflectors Fish Hatchery |
| 摘要： | Dworshak Dam, located on the North Fork of the Clearwater River near Orofino, Idaho, is the highest straight-axis concrete gravity dam in the united States (717 feet from foundation to 3,300-foot-long crest). The project includes a powerhouse for six Francis-type units (ultimate installation), a selective withdrawal structure upstream from the powerhouse intakes, two spillway bays and three regulating conduits that discharge into a stilling basin, an excavated exit channel, and facilities for migratory fish. The Dworshak national Fish Hatchery was constructed to spawning and rearing for steelhead trout that formerly migrated into the north fork. The report describes studies accomplished in four hydraulic models and three full-scale test problems. The investigations presented in this report discuss various water-conveyance structures. The tests indicated a need for remedy unsatisfactory flow conditions for cofferdam closure and cable loading on the diversion tunnel closure structure were studied. Tests and data obtained during development of design of the spillway, regulating conduits, and stilling basin are presented in the report. The design of the skewed regulation conduit entrances were of primary concern in the project. Prototype operation of the outlets resulted in cavitation damage downstream from the valves; an aeration deflector was designed in the model to remedy the problem. Other items presented include tests on seals for the eccentric-trunnion tainter gate vales in the regulating conduits, fish hatchery appurtenances, and measurements of torque on torsion bars of pressure relief panels in the powerhouse selective withdrawal system. |
| 报告类型： | 科技报告 |
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