RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (06): 974-980.doi: 10.11870/cjlyzyyhj201606014

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EXPERIMENTAL STUDY ABOUT ATTRACTIVE EFFECTS FOR FISH IN DIFFERENT FLOW VELOCITY BY THE MODEL OF THE NO.1 SHIP LOCK OF THE GEZHOU DAM

WANG Cong-feng1,2, CHEN Ming-ming1, LIU De-fu3, XIONG Feng1, LIU Hui-jie1, ZHU Liang-kang1   

  1. 1. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China;
    2. Synergistic Innovation Center of Geological Disasters and Ecological Environment in the Three Gorges Region in Hubei Province, Yichang 443002, China;
    3. College of Resources and Environmental Engineering, Hubei University of Technology, Wuhan 430068, China
  • Received:2015-09-21 Revised:2016-01-15 Online:2016-06-20
  • Supported by:
    Special Funds for Public Industry Research Projects of the National Ministry of Water Resources (Grant No.201201030);Science and Technology Innovation Foundation for the CTGU in 2015(Grant No.2015CX014)

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Abstract: This research takes the Hypophthalmichthys molitrix as the object in the study toexplore the technology for inducing fish to swim cross the ship lock in a home-made Gezhou Dam ship lock mode. All fish are with an average length of 12.5±2.4cm and height of 21.3±3.5 g. The temperature is controlled in the range of (20±1)and DO is larger than 7 mg/L. One hundred fish were randomly selected for each experiment and tested for only once. When viewed video processing data, each region took a 2 hour continuous observation with 1 min intervals for a screenshot to record the distribution of fishes. The fish average aggregation rate (P), trapping efficiency index (I), gate crossing frequency (f) and the upstream and downstream residence time ratio (Tr) were the evaluation index to evaluate the actual effect of luring fish. The results show that an appropriate range of flow velocity had a certain attraction effect to induce the fish into the lock. When the average flow velocity at the gate section was about 0.45 m/s, the average aggregate rate and trapping efficiency index on the both side of the lock reached the maximum value, the rate of fish through the gate recurrence was the highest. When the flow velocity was 0 m/s (control group), the activity routines of fish was not obvious ,only given a certain flow rate, the activity of fish was regular, that was, the phenomenon of the top flow. When the flow velocity was between 0 and 0.45m/s, barycenter of fish mainly concentrated in high velocity area of the gate. When the velocity was greater than 0.45 m/s, then gradually increased, the frequency of the fish into the lock was on the decline, barycenter of fish mainly concentrated in the downstream side of gate, in where the flow velocity was relatively stable. When the velocity reached to 0.75 m/s, the fish reached the limit rate of swimming velocity in the silver carp. To through the gate of high-speed flow area, the fish must accelerate the tail beat frequency or burst slide. Because the gate guide wall distance is long and and the fish need to consume a lot of energy to get through the gate upstream, high-speed flow of fish produce certain drive effect. Therefore, appropriate velocity on the gate region downstream of fish had a certain induction, and fish trapping efficiency between the frequency and velocity of the ship lock showed significantly correlated. When the velocity was greater than 0.75m/s, fish failed to against the stream gradually, and no longer gathered around the gate, then escaped. This paper is expected to provide basic data for the feasibility study of low-head hydro project combined with fishway, and also offer reference for the study of the fish behavior in the future.

Key words: ship lock, dam-passing buildings, flow velocity, attractiveeffects, fish behavior

CLC Number: 

  • S917.4
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