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Fish Guidance Structures: New Head Loss Formula and Fish Guidance Efficiencies

Author(s): Robert M. Boes, Ismail Albayrak

Linked Author(s): Ismail Albayrak

Keywords: Downstream fish migration, fish guidance efficiency, fish guidance structure, head loss, modified angled bar rack

Abstract: The installation of hydropower plants (HPP) and dams may cause problems for the fish fauna, such as blocking or delaying up- and downstream fish migration, injury or mortality of fish when passing turbines or spillways, and mortality due to predation by fish or birds. As a result, species population can decline. To counter these negative impacts for the downstream migration, fish protection systems and downstream migration facilities have recently been focused on the framework of re-establishing river continuity for the fish fauna. Etho-hydraulic research results on angled fish guidance structures (FGS) with vertical bars indicate that the modified version of conventional louvers and angled bar racks, i. e. modified angled bar racks (MBR), is a viable option and potentially applicable at prototype HPP. This paper presents the results of two experimental investigations on such FGS conducted at VAW of ETH Zurich


Year: 2017

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