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The excessive development of small hydropower stations has led to the formation of water-depleted and dewatered river sections, causing damage to the river's ecological environment. To investigate the minimum ecological flow requirements and the effectiveness of restoration measures in these dewatered reaches, this study selected the downstream reach of the Rundi Hydropower Station on the Tao River as the research area, with the Gymnodiptychus pachycheilus as the indicator species. By integrating the habitat simulation method and the modified Tennant method, the minimum ecological flows were determined for different life stages of the species across seasonal periods. A water allocation schedule was then developed based on the ecological flow requirements. Numerical simulation was used to compare the habitat improvement effects of the original river channel with those of three engineering measures: deep groove excavation, gravel cluster arrangement, and their combination. The results show that the minimum ecological flows in the original river channel during the migration and spawning stages were 100 m3/s and 80 m3/s, respectively, while those in the gravel cluster-arranged channel were reduced to 70 m3/s and 60 m3/s respectively. The arrangement of gravel clusters increased the weighted usable habitat area for the indicator species by 8 441 m2 and 9 338 m2 during the migration and spawning stages, respectively.
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Basic Information:
DOI：10.20040/j.cnki.1000-7709.2026.20250542
China Classification Code:TV742;TV85;X143
Citation Information:
[1]ZHANG Wei,NAN Jun-hu,LI Wei.Research on Ecological Flow and Prevention and Control of Water Reduction and Dehydration in Water Reduction Section of River Channel for Small Hydropower Stations[J].Water Resources and Power,2026,44(03):62-67.DOI:10.20040/j.cnki.1000-7709.2026.20250542.
Fund Information:
国家自然科学基金地区科学基金项目(52069011); 甘肃省科技计划项目(25JRRA130)
2025-03-25
2025
2025-06-04
2025
1
2025-12-30
2025-12-30
2025-12-30