SUN Shuang-ke, ZHANG Guo-qiang (State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract: As a special releasing structure, fishway can help the fish species migrate through the dam & gate successfully. It is essential to maintain the river continuum and intercommunion between different fish species. Close-to-nature type of fish passes is one of the most popular layout of fishways in the world, its marked characteristics are that individual boulders and locally substrates are adopted for the fishway construction in order to imitate as closely as possible the flow pattern of natural river, and therefore it has higher running efficiency for fish migration than traditional technical fishways. This paper introduces the close-to-nature type of fish passes in detail including its principle, constructions styles, method of design, and hydraulic calculations etc., and proposes some advice for the improvement of our country ’ s fishway technology in the future.

Key words: close-to-nature type of fish passes; individual boulder; bottom ramp and slope; bypass channel; fish ramp

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 10 No. 1 March. 2012)