Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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An analysis on effectiveness of circular culvert fishway

원형암거 어도의 효과 분석

  • Kim, Ki Heung (Department of Civil Engineering, Gyeongnam National University of Science and Technology)
  • 김기흥 (경남과학기술대학교 토목공학과)
  • Received : 2020.09.15
  • Accepted : 2020.10.16
  • Published : 2021.01.31
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Abstract

The purpose of this study was to present the necessity and effect of culvert fishway, based on the absence of design criteria for it which fishes can pass. As an attempt for this purpose, circular culvert fishway were designed hydraulically to meet the passage condition for selected target fish species, and post-monitoring was performed to confirm its effectiveness. In the case of general circular culvert without weir baffles, the target fish species cannot pass because of the constant depth and velocity in the entire reach of the circular culvert, so it was confirmed that resting pools must be installed to help fish passage. In the case of circular culvert with weir baffles, the depth and the mean velocity in resting pool increased by about 240% and decreased by about 70% respectively, which not only satisfied the passage conditions of Zacco platypus that can swim at more than 10 times the speed of body length for 1 to 5 seconds, but also confirmed that various river fish could pass. Post-monitoring results of the restoration reach and fish capture monitoring surveys of circular culvert fishway demonstrated that the target fish species, Zacco platypus, can pass through it.

본 연구는 어류소상을 위한 암거어도에 대한 설계기준이 미비함에 착안하여 그 필요성과 효과를 제시하고자 하였다. 이러한 목적을 위한 시도로서 선정된 목표어종에 맞추어 수리학적으로 원형암거 어도를 설계하였으며, 설치된 어도에 대한 효과를 확인하기 위한 모니터링을 시행하였다. 위어 배플을 설치하지 않은 일반적인 원형암거의 경우 암거 전체 구간에서 일정한 수심과 유속이 형성되기 때문에 대상어종이 소상할 수 없으므로 어류소상을 돕기 위해서는 반드시 휴게풀이 있는 어도의 설치가 필요함을 확인하였다. 위어 배플이 설치된 원형암거 경우에 휴게풀에서 수심은 240% 증가하고 유속은 70%가 감소하므로써 1 ~ 5초간 체장의 10배 이상의 돌진속도로 유영할 수 있는 피라미의 소상조건을 만족시킬 뿐 아니라 다양한 하천성 어종의 소상이 가능함을 확인하였다. 복원구간에 대한 사후 모니터링과 원형암거 어도에 대한 어류 포획 모니터링 조사에서 목표어종인 피라미가 어도를 이용하여 소상함을 입증하였다.

Keywords

References

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