Structure of Flows in Various Kinds of Stream-Type Fishways

Abstract

Numerical analysis based on k-ε turbulence model is applied to complicated flows in stream-type fishways: Denil type, superactive-type bottom baffles and Alaska steeppass. In these fishways, the hydraulic resistance and cellular motions are controlled by obliquely arranged fins, and the effect of fins are represented by adding the terms of the longitudinally averaged drag and turbulent energy production corresponding to the workdone by the drag to the governing equation of flow. The present model can describe the outline of the flow behavior in various fishways of stream-type.