Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Appearance of Fish Species Based on the Weir's Density in the Four River Systems in Korea

국내 4대강 수계 하천의 보 밀도에 따른 어류 출현종 분석

  • 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

It was confirmed that the fish diversity decreased with increasing index of weir's density (IWD) in the four river systems. The IWD showed difference with watershed, it was high in the Nakdong River (NDR). Both two river systems of Gum River (GUR) and Yeongsan River (YSR) were similar, whereas relatively lower density observed in the Han River (HNR) system. A result of 2-Dimensional Kolmogorov-Smirnov (2-DKS) as a nonparametic test showed different threshold values affecting fish diversity with the river systems. The p-values based on Dmax, were significantly different at 0.05 level (except for YSR). The threshold values affecting fish diversity were also different with watershed. The values were 1.6/km of the HNR, 1.3/km of the NDR, and 2.3/km of the GUR, respectively. The fish diversity was decreased when IWD is over threshold values. The IWD of total 404 rivers (about 33%) among 1,217 surveyed in this study showed above threshold value. These rivers should be considered first for evaluating river continuity. The IWD and threshold value suggested in this study would be useful for selecting a stream priority for river connectivity study.

4대강 수계 하천에 설치된 보 밀도는 어류의 종 다양성에 영향을 주는 요인임을 확인하였다. 보 밀도 지수는 수계별로 차이를 보였으며, 낙동강 수계하천이 가장 높게 나타났으며 (17±1.6), 금강 (1.5±1.3)과 영산강(1.4±1.1)은 비슷하게 나타났다. 반면, 한강 수계하천(1.3±1.2)에서는 보 밀도가 낮게 나타났다. 2-DKS 분석 결과 영산강 수계를 제외하고 Dmax에 따른 p-value는 0.05 이하로서 어류의 출현종수는 보 밀도에 의존하는 것으로 나타났다. 어류 종 다양성에 영향을 주는 보 밀도 역치값 (Threshold value)은 수계별로 다르게 나타났으며. 한강수계 1.6개/km, 낙동강 수계 1.3개/km, 금강수계 2.3개/km 이상에서 어류 출현종수는 감소하는 것으로 나타났다. 본 연구에서 조사한 총 1,217개 하천 가운데 33%인 약 404개 하천의 보 밀도 지수가 역치값 이상인 것으로 나타났다. 이러한 하천은 수생태계 연속성 확보가 시급하기 때문에 우선 대상 하천으로 선정하여 역치값 이하로 보 밀도를 관리할 필요가 있다.

Keywords

Acknowledgement

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

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