Effect of Gezhouba Dajiang discharge on space distribution features of Chinese sturgeon spawning grounds
Wang Yu1, Dai Huichao1,2, Mao Jingqiao2, Peng Xiuhua3
1.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3.The Dam & Reservoir Ma-nagement Center of Guodian Dadu River Basin Hydropower Development Co. Ltd., Leshan, Sichuan 614900, China
Gezhouba dam building blocks the migration route of the Chinese sturgeon, forcing to form new spawning grounds under the gezhouba dam 4 km range, therefore, Gezhouba discharge would affect the spatial distribution of the Chinese sturgeon spawning grounds. For studying the effect of Dajiang power plant discharge variation on the spatial distribution characteristics of Chinese sturgeon spawning habitat suitability under the condition of Gezhouba small discharge, a deep analysis and research was made on the basis of 3D hydrodynamic mathematical model and spawning habitat evaluation model of Chinese sturgeon spawning grounds. Results show that the increasing of Dajiang power plant unit discharge by within 200 m3/s can increase the Chinese sturgeon spawning habitat suitable values, which is beneficial to promote Chinese sturgeon naturally reproduce. The increase of each unit discharge in Dajiang power has a certain impact on spatial distribution of the Chinese sturgeon spawning grounds. When each unit flow increases less than 200 m3/s, the area of Chinese sturgeon spawning grounds would enlarge, and spawning location would expand from the right bank to the left bank, while Chinese sturgeon would get broader spawning space. The conclusion can provide reference for the ecological benefits of Gezhouba units under increasing capacity operation.
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