Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Hydrological and Ecological Alteration of River Dynamics due to Multipurpose Dams

다목적댐 건설에 따른 하천의 생태 및 수문환경 변화

  • Cho, Yean-Hwa (Department of Civil Engineering, Joongbu University) ;
  • Park, Seo-Yeon (Department of Civil Engineering, Joongbu University) ;
  • Na, Jong-Moon (Department of Civil Engineering, Joongbu University) ;
  • Kim, Tae-Woong (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Lee, Joo-Heon (Department of Civil Engineering, Joongbu University)
  • 조연화 (중부대학교 토목공학과) ;
  • 박서연 (중부대학교 토목공학과) ;
  • 나종문 (중부대학교 토목공학과) ;
  • 김태웅 (한양대학교 건설환경공학과) ;
  • 이주헌 (중부대학교 토목공학과)
  • Received : 2019.10.05
  • Accepted : 2019.11.21
  • Published : 2019.12.30
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Abstract

Alteration in the flow regime of rivers are caused by natural climate change and the changes in anthropogenic hydrological environment due to dam construction. These changes in flow regime cause serious changes not only in the fresh water ecosystems of the rivers but also in the physical structures and fish habitats of the streams. In this study, the alteration in the hydrological characteristics of the Gam river basin due to Buhang dam construction and the changes in ecological health condition, water quality, and river cross-section were analyzed. As a result of analysis by indicators of hydrologic alteration (IHA) to quantitatively change the flow regime of Gam river, HA (Hydrologic Alteration) is more than ±1 and various changes have occurred in the river ecosystem after Buhang dam construction. In addition, ecological health condition and water quality showed different response for each element, and in the case of riverbeds and channel cross-sections, the degradation of channel bed was obviously monitored after dam construction. The results of this study are expected to be used as an efficient method for evaluating changes in stream ecosystems caused by stream regime changes.

자연적 기후변화와 댐 건설로 인한 인위적 수문환경의 변화로 인하여 하천의 유황(flow regime) 변화가 발생하며, 이러한 유황의 변화는 하천의 생태계뿐만 아니라 하천의 물리적 구조와 어류서식처 등에도 심각한 변화를 야기한다. 본 연구에서는 감천유역의 부항댐 건설로 인하여 나타난 수문특성변화와 동시에 하천의 생태건강성 및 수질, 하천단면 변화를 분석하였다. 감천의 유황 변화를 정량적으로 파악하기 위해 수문변화지표(Indicators of Hydrologic Alteration, IHA)에 의한 분석 결과, HA(Hydrologic Alteration)가 대부분 ±1 이상으로 댐 건설 후 하천생태계에 다양한 변화가 발생한 것으로 판단된다. 또한, 생태건강성등급 및 수질은 각 요소마다 상이한 반응이 나타났으며, 하천의 하상 및 단면의 경우에는, 댐 건설 후에 하상 단면의 저하가 뚜렷하게 나타났다. 본 연구의 성과는 하천의 유황 변화에 의한 하천생태계의 변화를 평가하기 위한 효율적인 방법으로 활용될 수 있을 것으로 기대된다.

Keywords

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