|Effect of Ecological Operation of Three Gorges Reservoir on Spawning Habitat Area of the Four Major Chinese Carps
|中文关键词:生态调度 四大家鱼 适宜度指数 生境面积 三峡水库
|英文关键词:ecological operation four major Chinese carps suitability index habitat area Three Gorges Reservoir
| Ecological operation of hydropower facilities is necessary to protect fishery resources and the effect of the ecological operation can be evaluated by monitoring the scale of spawning habitat for target fish species. From May 27 to June 3, 2023, an ecological operation experiment at Three Gorges Reservoir (TGR) was carried out, aiming to increase natural reproduction of the four major Chinese carps downstream of Gezhouba Dam, a run-of-the river dam below TGR at Yichang. In this study, a section of the Yangtze River from Gezhouba Dam to Zhijiang was investigated. The impact of ecological regulation on the spawning habitat area of the four major Chinese carps was estimated based on model simulations. The quality assessment model for spawning habitat was established by coupling a two-dimensional hydrodynamic model to the spawning habitat suitability index (HSI) curve. Four major habitat factors (water level amplitude, water depth, flow rate, and water temperature) were selected as model parameters. The spatial and temporal distribution of the comprehensive spawning HSI was simulated and the change in suitable spawning habitat area was analyzed. Results show that during ecological operation in 2023, the comprehensive spawning habitat suitability index increased by 60% in the study section, and the proportion of suitable spawning habitat area (weighted available area) increased from 30.45% to 55%. The areas suitable for spawning for the four major Chinese carps, with a comprehensive spawning habitat suitability index ranging from 0.6 to 1.0, have significantly increased from 4.67% to 60% of the total study area. In conclusion, the ecological regulation of Three Gorges Reservoir in 2023 significantly improved the quality of spawning habitat for the four major Chinese carps from Gezhouba dam to Zhijiang.
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