Curve plotting method for adaptability of fish to hydrodynamic force parameters

Abstract

The invention provides a curve plotting method for adaptability of fish to hydrodynamic force parameters. The curve plotting method for the adaptability of the fish to the hydrodynamic force parameters includes: building a vertical seam type fishway model with three types of lead angles, and using the lead angles for manufacturing different feature flow fields; performing fish release tests and recording videos; obtaining features of the different feature flow fields; portioning a test area in the vertical seam type fishway model into different flow field areas; calculating a quantity ratio ofthe test fish in the different flow field areas; and plotting a curve of the adaptability of the fish to the hydrodynamic force parameters according to the quantity ratio of the test fish in the different flow field areas. The curve plotting method for the adaptability of the fish to the hydrodynamic force parameters can confirm the range of each favorite key hydraulic power factor in successfulupstream swimming of target fish species, is used for guiding and optimizing hydrodynamic design of a vertical seam type fishway, improves fish passing efficiency, really develops function of an ecological rehabilitation project of the vertical seam type fishway, and has certain scientific significance and reference value, and furthermore can be popularized and used in fishway hydraulics study taking various fish species as fish passing objects.

Description

technical field [0001] The invention belongs to the field of fishway design and relates to a method for drawing adaptability curves of fish to hydrodynamic parameters. Background technique [0002] The migratory behavior of fish is the periodic, directional and clustered migration of fish between the "three fields" - wintering ground, spawning ground and feeding ground, in order to meet the growth and development needs of fish and adapt to the outside world. environmental change. After the construction of permanent barrage structures on natural rivers, one of the important impacts is to block the longitudinal connectivity of the river and cut off the migration channels between the "three farms" of fish, which seriously affects fish feeding and overwintering. , spawning and other living habits have led to the loss of fish population diversity, the degradation of economic fish quality, and even caused some anadromous fish populations to be on the verge of extinction. In the ...

AI Technical Summary

Problems solved by technology

Therefore, if the hydraulic design lacks the consideration of the swimming behavior characteristics of fish, it is often difficult for fishway engineering to achieve the ideal fish passing effect. At present, the hydraulic design of fishways mostly refers to the fish swimming ability index, and the fish swimming ability index is measured on a uniform basis. However, there are shortcomings such as a single flow field, restricted swimming behavior of fish, making fish passively swim continuously without allowing their physiological energy consumption to recover, etc.

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