Schizothorax prenanti swimming behavior in response to different flow patterns in vertical slot fishways with different slot positions
| Autor: | Haitao Liu, Li Guangning, Shuangke Sun, Tiegang Zheng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Length scale
China Environmental Engineering 010504 meteorology & atmospheric sciences Fish species Cyprinidae 010501 environmental sciences 01 natural sciences Rivers Environmental Chemistry Animals Waste Management and Disposal Swimming 0105 earth and related environmental sciences Hydrology Fish migration biology Experimental model Reproduction Flow pattern biology.organism_classification Pollution Schizothorax prenanti Critical parameter Turbulence kinetic energy Geology |
| Zdroj: | The Science of the total environment. 754 |
| ISSN: | 1879-1026 |
| Popis: | Fish swimming behavior is a critical parameter for the design of vertical slot fishways. Although Schizothorax prenanti is a significant reproductive potamodromous migratory fish species in the upper reaches of the rivers in Southwest China, its swimming behavior has not been extensively researched. Therefore, in this study, a comparative experiment was conducted in vertical slot fishways to analyze the behavior of Schizothorax prenanti in response to different flow patterns, with respect to different slot positions. The experimental model was designed with a length scale of 1:4, and a method for selecting the appropriate fish size in the scaled physical model was proposed. Based on these experiments, it was found that the typical upstream trajectories of Schizothorax prenanti are traceable to the sidewall of the pool, which are characterized by low velocity and turbulent kinetic energy (TKE). The hydraulic variables exhibited an asymmetric distribution within the vertical slot, and the fish were found to pass through the area with the lowest velocity and TKE. A flow pattern with a guide wall length-to-pool width ratio of P/B = 0.25, in which Schizothorax prenanti can immediately find the sidewall, is suitable for fish migration. Therefore, this is the recommended value for the construction of effective vertical-slot fishway structures. |
| Databáze: | OpenAIRE |
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