Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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A study on investigation of stream drying phenomena in tributaries of the Han River basin and estimation of ecological flow

한강유역 하천건천화 발생 지류하천에 대한 실태조사 및 환경생태유량 산정에 관한 연구

  • Kim, Yongwon (Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University) ;
  • Kim, Wonjin (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Woo, Soyoung (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Yonggwan (Asia Infrastructure Research Center, Konkuk University) ;
  • Kim, Seongjoon (Division of Civil and Environmental Engineering, College of Engineering, Konkuk University)
  • 김용원 (건국대학교 일반대학원 사회환경플랜트공학과) ;
  • 김원진 (한국건설기술연구원 수자원하천연구본부) ;
  • 우소영 (한국건설기술연구원 수자원하천연구본부) ;
  • 이용관 (건국대학교 아시아시설물연구센터) ;
  • 김성준 (건국대학교 공과대학 사회환경공학부)
  • Received : 2024.05.14
  • Accepted : 2024.07.19
  • Published : 2024.08.31
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Abstract

This study aims to investigate stream drying phenomena and determine ecological flow in upper Jungnangcheon basin(118.2 km2) of Han River basin. Satellite imagery was used to compare historical and current land cover, and field surveys, including fish surveys, were conducted to assess stream drying conditions. Satellite image analysis revealed a significant increase in impervious surface area due to the expansion of residential and commercial areas. Streamflow and water quality measurements at Hannae Bridge in study area during the dry season showed and average minimum flow of 1.39 m3/sec and elevated SS levels, indicating poor water quality for T-P and TOC. The representative fish species in the study area was P.herzi. Optimal habitat suitability index for depth, velocity, and substrate were 0.3~0.5 m, 0.1~0.3 m/sec, and sand, respectively. Using PHABSIM, the ecological flow for the study area was estimated as 1.00 m3/sec. The derived ecological flow can be used as a reference flow for stream drying mitigation strategies.

본 연구의 목적은 한강유역 중랑천 상류유역(118.2 km2)을 대상으로 건천화에 대한 실태조사를 수행하고, 건천화 회복 기준유량이 될 수 있는 환경생태유량을 산정하는 것이다. 건천화 실태조사를 위해 위성영상을 활용하여 과거와 현재를 비교하고, 어류조사를 포함한 현장조사를 수행하였다. 위성영상 분석 결과, 주거지역과 상업지역이 많이 증가하여 불투수 면적이 크게 증가한 것으로 분석되었다. 중랑천 한내교에서 갈수기시 유량과 수질을 조사한 결과, 갈수기 최저 유량은 평균 1.39 m3/sec로 조사되었고 이 시기에서 T-P와 TOC가 약간 나쁨, 나쁨으로 조사되어 갈수기시 수질이 안 좋은 것으로 조사되었다. 대상유역의 대표어종은 돌고기(P.herzi)로 조사되었고 최적 HSI는 수심, 유속, 그리고 하상재료에서 각각 0.3~0.5 m, 0.1~0.3 m/sec, 모래로 조사되었다. PHABSIM을 이용하여 대상유역에 대한 환경생태유량을 산정하였고, 최적 환경생태유량은 1.00 m3/sec로 산정되었다. 산정된 환경생태유량은 건천화 대응방안에 대한 기준유량으로 활용될 수 있다.

Keywords

Acknowledgement

본 결과물은 환경부의 재원으로 한국환경산업기술원의 수생태계 건강성 확보 기술개발사업의 지원을 받아 연구되었습니다(2020003050001). 본 결과물은 환경부의 재원으로 한국환경산업기술원의 가뭄대응 물관리 혁신 기술개발사업의 지원을 받아 연구되었습니다(2022003610002). 본 연구는 한강수계관리위원회 환경기초조사사업의 지원을 받아 수행되었습니다(HGWMC-214010110303).

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