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2024 Vol.57, Issue 8 Preview Page

Research Article

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

Yongwon Kima
,
Wonjin Kimb
,
Soyoung Woob
,
Yonggwan Leec
,
Seongjoon Kimd*
김 용원a
,
김 원진b
,
우 소영b
,
이 용관c
,
김 성준d*
aPh.D. Candidate, Department of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University, Seoul, Korea
bPostdoctoral Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
cAssistant Professor, Asia Infrastructure Research Center, Konkuk University, Seoul, Korea
dProfessor, Division of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul, Korea
a건국대학교 일반대학원 사회환경플랜트공학과 박사수료
b한국건설기술연구원 수자원하천연구본부 박사후연구원
c건국대학교 아시아시설물연구센터 조교수
d건국대학교 공과대학 사회환경공학부 정교수
*Corresponding Author
31 August 2024. pp. 519-532
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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.

Keywords
Stream drying phenomena
Ecological flow
Upper Jungnangcheon basin
Field survey
P.herzi

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.

키워드
건천화
환경생태유량
중랑천 상류유역
현장조사
돌고기
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 57
  • No :8
  • Pages :519-532
  • Received Date : 2024-05-14
  • Revised Date : 2024-07-17
  • Accepted Date : 2024-07-19
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.8.519
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