Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Impact of the Crossed-Structures Installed in Streams and Prediction of Fish Abundance in the Seomjin River System, Korea

하천에 설치된 횡구조물의 영향 및 섬진강 수계의 어류 풍부도 예측

  • Moon, Woon Ki (Department of Environmental Ecology, Environment Solution Partners, Co.) ;
  • Noh, Da Hye (Department of Environmental Ecology, Environment Solution Partners, Co.) ;
  • Yoo, Jae Sang (Department of Environmental Ecology, Environment Solution Partners, Co.) ;
  • Lim, O Young (Department of Environmental Ecology, Environment Solution Partners, Co.) ;
  • Kim, Myoung Chul (SOKN Institute of Ecology and Conservation, Inc.) ;
  • Kim, Ji Hye (Watershed Planning Division, Yeongsan River Basin Environmental Office) ;
  • Lee, Jeong Min (Watershed Planning Division, Yeongsan River Basin Environmental Office) ;
  • Kim, Jai Ku (Department of Environmental Ecology, Environment Solution Partners, Co.)
  • 문운기 ((주)엔솔파트너스) ;
  • 노다혜 ((주)엔솔파트너스) ;
  • 유재상 ((주)엔솔파트너스) ;
  • 임오영 ((주)엔솔파트너스) ;
  • 김명철 ((주)SOKN생태보전연구소) ;
  • 김지혜 (영산강유역환경청 유역계획과) ;
  • 이정민 (영산강유역환경청 유역계획과) ;
  • 김재구 ((주)엔솔파트너스 기업부설연구소)
  • Received : 2022.03.10
  • Accepted : 2022.06.08
  • Published : 2022.06.30
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Abstract

The relationships between river length and weir density versus fish species observed were analyzed for 210 local rivers in the Seomjin River system (SJR). A nonlinear exponential relationship between river length and number of fish species were observed. Model coefficient was 0.03 and coefficient of determinant (R2) was 0.59, meaning that about 59.0% of total variance was explained by river length variable. Predicted value by model and observed number of species showed a difference. About 110 local rivers (about 52.4%) showed lower value than predictive value. The average index of weir's density (IWD) in the SJR was about 2.7/km, which was significantly higher than that of other river basins. As a result of nonparametric 2-Kimensional Kolmogorov-Smirnov (2-DKS) analysis based on the IWD, the threshold value affecting fish diversity was about 2.5/km (Dmax=0.048, p<0.05). Above the threshold value, it means that the number of fish species would be decreased. In fact, the ratio of the expected species to the observed species was lowered to less than 70%, when the IWD is higher than the threshold value. To maintain aquatic ecological connectivity in future, it is necessary to manage IWD below the threshold value.

섬진강 수계 210개 지방하천을 대상으로 하천연장과 보 밀도 대비 어류 출현종 현황을 분석하였다. 하천연장에 따른 어류 출현종수는 비선형지수함수 (Nonlinear exponential relationship) 관계를 보였다. 모델에 따른 계수값 (b)은 0.03이며, 결정계수(R2)은 약 59.0%인 것으로 나타났다. 모델식에 따른 예측기대종수는 실제 출현종수와 차이를 보였으며, 대상하천 가운데 약 110개 하천 (약 52.4%)에서 실제 출현종수는 예측기대종수보다 낮게 나타났다. 한편 섬진강 수계 하천에서 나타난 평균 보 밀도는 약 2.7개/km였으며, 이는 타 수계 하천과 비교시 월등히 높은 수치였다. 보 밀도 지표 (Index of Weir's Density, IWD)에 따른 어류출현종수간의 2-DKS 분석 결과 어류 다양성에 영향을 주는 보 밀도 역치값 (Threshold value)은 약 2.5개/km인 것으로 나타났다 (Dmax=0.048, p<0.05). 실제 보 밀도 지표가 역치값 이상인 경우 어류 출현종수 대비 기대 종수비율은 70% 미만으로 낮아졌다. 따라서, 향후 수생태계 연속성 확보를 위한 보 밀도는 역치값 이하로 관리하는 것이 필요하다.

Keywords

Acknowledgement

본 연구는 2020 - 2021년도 영산강.섬진강수계 환경기초조사사업의 연구비지원에 의해 수행되었습니다.

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