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Numerical Modeling of Flow in Hydropower Intakes

by Robert J. Fennema, Washington State Univ, Pullman, WA, USA,
Walter C. Mih, Washington State Univ, Pullman, WA, USA,



Document Type: Proceeding Paper

Part of: Water for Resource Development

Abstract:

To reduce high mortality of downstream migrating juvenile salmon at hydraulic turbines, traveling screens are used to guide the juveniles into a bypass channel for safe passage. However, if the flow impact velocity on the screen is too high, the fish can be descaled or injured. The impact velocity is defined as the component of water velocity perpendicular to the screen at its upstream surface. A finite-difference numerical model is used to simulate fluid flow in the intake at Rock Island Dam on the Columbia River. The physical model provides data for initialization and verification of the numerical model. Determination of the impact velocities at the screen surface by the numerical model are discussed.

Subject Headings: Numerical models | Water intakes | Fluid velocity | Physical models | Mathematical models | Hydro power | Fluid flow

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