RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2023, Vol. 32 >> Issue (5): 939-949.doi: 10.11870/cjlyzyyhj202305005

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A Simulation Study of Gravel Cluster Restoration at Fish Spawning Grounds in  Upper Chishui River

LI Xuan1,2，ZHAO Jin-yong1，ZHANG Jing1，AI Zu-jun3，HAN Hui-ling2，WANG Qi1，YU Zi-cheng1，FENG Shuo1   

  1. （1.China Institute of Water Resources and Hydropower Research，Beijing 100038，China；2. College of Urban and Rural Construction，Hebei Agricultural University，Baoding 071000，China；3.Yunnan Management and Conservation Bureau of the Upper Yangtze River Rare and Endemic Fish National Nature Reserve, Zhaotong 657000，China）
  • Online:2023-05-20 Published:2023-05-19

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Abstract: In order to quantitatively analyze the effect of gravel groups on the restoration and improvement of damaged habitats of fish, the Bamaoba fish spawning ground at the upstream of Daoliu River, a tributary of Chishui River, is taken as the research area. As an endemic fish to Zhaotong, Schizothorax grahami is selected as the indicator species, and the layout and size of boulder clusters are determined by stability analysis. Based on the fish habitat model, the changes of suitable habitats of the indicator species before and after the arrangement of boulder clusters are studied and analyzed. The results showed that it is suitable to set the minimum size of the generalized boulder unit as 0.5 m, the span of a single boulder clusters as 1.60 times the boulder length, and the span of boulder clusters at the downstream as 2.10 times the boulder length. The weighted usable-habitat area (WUA) of fish corresponding to five different types of boulder clusters increase in different degrees. Under the dominant discharge parameter, the continuous V-shaped and diamond-shaped arrangements of boulder clusters have more obvious effects on restoration than the other three types. The water depth and velocity in the area where boulder clusters are arranged are diversified and the proportion of the weighted usable-habitat area to the total area is increased by 21.77% and 18.3% respectively. Reasonable arrangement of boulder clusters can provide technical support for the restoration of fish spawning grounds by Chishui River.

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