Fish inlet design method in accordance with natural flow law and fish behavior characteristics

Abstract

The invention discloses a fish inlet design method in accordance with the natural flow law and fish behavior characteristics. The method comprises the five portions that firstly, the fish species andhabits of a project area are investigated and gathered; secondly, the characteristic velocities, including the induced velocity Sr, the dash swimming velocity Sb and the favored flow velocity Sl of atarget fish are determined through gathering or fish swimming capability tests; thirdly, the natural river target fish limit flow is obtained; fourthly, given the practical operating function after aproject is built, a gate and a fish passing facility operating mode in high accordance with waterflow conditions favored by the target fish in natural state before the project is built are sought; andfifthly, fish inlet fish-attracting waterflow conditions and fish inlet shapes which are attractive enough to the target fish are determined. According to the fish inlet design method provided by theinvention, the original operating function of the project can be fully utilized, the optimal fish passing technology route in accordance with natural river flow characteristics and hydraulic characteristics favored by fish for breeding migration and grouping behaviors, the fish passing efficiency is high, and the social, economical and environmental benefits are critical in the respect of protecting the biodiversity and river connectivity.

Description

technical field [0001] The invention belongs to the technical field of fish passing facility engineering construction, and in particular relates to a design method of a fish inlet conforming to natural flow laws and fish behavior characteristics. Background technique [0002] After the construction of permanent barrage structures on natural rivers, the continuity and hydrological rhythm of the river are changed, which is often a devastating blow to migratory and semi-migratory aquatic organisms that need to migrate in a large range during the completion of life history. Because these aquatic organisms cannot reach the original breeding grounds, feeding grounds or wintering grounds to complete their life cycle, the amount of resources has been seriously affected, the genetic diversity of the population has declined, the quality of fish has deteriorated, and rare and endangered fish are facing the risk of extinction. The construction of Sanhe and Wanfu Sluices in Yangzhou, Jia...

AI Technical Summary

Problems solved by technology

After the 1960s, fishways have developed rapidly in the United States, Canada, Europe and Japan. However, due to the lack of in-depth research on fish behavior and natural river flow characteristics, key core technologies have not yet been broken through, and truly successful fishways have not yet been developed. Not much, the fishway built by the Garde Dam on the Seb River in North Africa in 1991 was not suitable for the upward tracing of sprats in the local rivers; in New South Wales, Australia, in the mid-1980s, due to the adoption of design standards that were not suitable for local fish, In the end, it was judged invalid, and similar situations happened in Japan and Taiwan, China

Images