RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (08): 1238-1246.doi: 10.11870/cjlyzyyhj201608010

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EXPERIMENTAL STUDY ON THE HYDRODYNAMIC CHARACTERISTICS OF ARTIFICIAL REEFS IN THE MIDDLE-LOWER REACHES OF YANGTZE RIVER

HAN Lin-feng1, WANG Ping-yi1, LIU Xiao-fei2   

  1. 1. National Engineering Technology Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China;
    2. Tianjin Research Institute for Water Transport Engineering, M. O. T, Tianjin 300456, China
  • Received:2015-11-27 Revised:2015-12-28 Online:2016-08-20
  • Supported by:
    Key special subjects of science and technology project of the Ministry of Transport (MOT): how gold waterway improve technology through capacity (201132881450);A special fund project of basic scientific research expenses of Central public welfare scientific research institutes (201303047)

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Abstract: Because of the Three Gorges reservoir, the hydrological and ecological system in the middle-lower reaches of Yangtze River has changed significantly, which leaded to four major Chinese carps spawning suitability decreased and reproductive migratory fish like Acipenser sinensis eggs hatching rate decreased. The construction of artificial reef is an important measure to alleviate the decline of the Yangtze River fishery resources, protect the species diversity and maintain the sustainable development of the Yangtze River fisheries. Based on the flume experiment, the revetment blocks combined with the hollow hexahedron artificial reefs were installed in the river slope, which constituted the reeftype ecological revetment. Through the measurement and analysis of the hydraulic characteristics around reefs like water line and flow velocity, the fish spawning field hydraulic factors were developed. The results show that the flow velocity around the hollow artificial reefs maintained between 0.84m/s and 1m/s, which is in the most appropriate spawning flow rate of four major Chinese carps. Due to the existence of artificial reefs, the flow velocity gradient around bank increased and some complex flow regime included upwelling and wake vortices produced. These hydraulic factors also stimulated the mating activity of four major Chinese carps, and increased the amount of fish.

Key words: middle-lower reaches of Yangtze river, artificial reefs, hydraulic factor, four major Chinese carps, flume experiment

CLC Number: 

  • S953.1
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