Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Assessment of Influx Efficiency at By-Pass Fishway Using Two-Dimensional Physical Habitat Simulation Model -Focused on Zacco Platypus-

인공하도식 어도에서 2차원 물리서식처 모형을 이용한 어류 유입 효율 평가 -피라미를 대상으로-

  • Baek, Kyong Oh (Department of Civil, Safety, and Environmental Engineering, Hankyong National University) ;
  • Park, Ji Hyun (Department of Environmental Engineering, Inje University) ;
  • Kim, Young Do (Department of Environmental Engineering, Inje University)
  • 백경오 (국립한경대학교 토목안전환경공학과) ;
  • 박지현 (인제대학교 환경공학과) ;
  • 김영도 (인제대학교 환경공학과(낙동강유역환경연구센터))
  • Received : 2013.02.06
  • Accepted : 2013.03.21
  • Published : 2013.06.30
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Abstract

In this study, the efficiency of the by-pass fishway installed at Kangjung-Goryong Weir in Nakdong River was assessed by using River2D which is a two-dimensional physical habitat simulation model. The model was calibrated and validated through the measured water elevation. The assessment was performed according to flow condition such as flood, normal, and low flow. Especially the low flow condition was focused on because the target fish, Zacco Platypus, have moved frequently up and downstream at the spawning season from April to June. From simulation results, it can be deduced that the influx efficiency and the passage efficiency of the fishway in the low flow is higher than that in the flood and normal flow due to occurrence of proper velocity at fishway entrance.

본 연구에서는 낙동강 본류의 강정고령보에 설치된 인공하도식 어도의 효율성을 2차원 물리서식처 모형인 River2D를 이용하여 평가해 보았다. 강정고령보 상하류단의 실측 수위를 이용하여 모형을 보정 및 검정하였다. 모의조건은 2012년 풍수량, 평수량, 저수량을 기준으로 어도 입구 및 어도 내부의 흐름장을 분석하였다. 특히 본 연구의 목표종인 피라미가 산란기인 봄철에 주로 이동을 하므로, 저수기를 기준으로 어도가 기능을 잘 유지하는지 살펴보았다. 분석결과, 풍수 및 평수기에는 본류 수위가 높아 어도로의 피라미 유입 효율성이 떨어져 보였다. 반면 저수기에는 본류의 낮은 수위로 인해 어도 입구에 상대적으로 적절한 유속이 발생하여 유입효율과 이동효율이 높아질 것으로 평가되었다. 어도 내 흐름은 어류가 소상하기에 무리가 없는 유속장이 발생하는 것으로 파악되었다.

Keywords

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