Hand-drop meadow and modular fish passes at hydroenergetic facilities

Abstract

Aim of the study: The purpose of the work is to determine the hydraulic conditions in the high bleed meander passage on the basis of model tests in which the correct migration of aquatic organisms is ensured. Material and methods: The concept of a new version of the meander fish pass was developed at the Hydraulic Laboratory at the University of Life Sciences in Wrocław. A characteristic feature of this fish pass, in addition to its compactness, is the modular structure that can be expanded in any way. The idea of ​​a high bleed meander fish pass is based on a helical surface. The tests were performed on a 1: 3 scale model based on the Froude similarity criterion. Important elements of the research were measurements of point speeds, stream distribution and turbulence at variable Q flow. Results and conclusions: The tested fish pass model for high bleeds meets the basic design assumptions. The speeds in the chambers do not exceed the permissible values ​​for fish. At rest the speed does not exceed the limit. The distribution of streams shows that resting spaces with reduced flow velocities are created inside the chambers. The main difference between meandering catches and traditional slotted catches is the type of flow in the pools, as well as the reduction of energy. The conducted tests show that the water velocities in the gaps of this fish pass are higher than in the slot fish gaps. The authors recommend designing more pools than traditional constructions.

Keywords

• river
• fish migration
• hydro power structures
• meander-modular fish pass