Flow Analysis and Occurrence Condition of Streaming Flow in Pool and Weir Type Fishway with Walls of Inclined Top

Abstract

It is said that the walls of circular arc top or inclined top are preferable for upstream migration of fish in pool and weir type fishway. Hydraulic characteristics for design of this type fishway with walls of circular arc top has been almost clarified. However, hydraulic characteristics about inclined top has not been clarified enough. This research showed that numerical analysis using VOF method in Cartesian coordinates, to which the concept of fraction of cell volume and cell face open to flow are applied, is effective. Additionally, occurrence condition of streaming flow which is thought to be not preferable for upstream migration of fish was indicated.