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Research Article

A strategy to enhancing flood control capacity in the Seomjin River basin through Nature-based Solutions: focusing on channel widening and floodplain storage

자연기반해법을 적용한 섬진강 유역의 홍수조절능력 제고 방안: 하도확폭 및 천변저류지를 중심으로

Kyong Oh Baeka
,
Dong Yeol Leeb*
백 경오a
,
이 동열b*
aProfessor, Department of Civil and Environmental Engineering, Hankyong National University, Anseong, Korea
bPh. D. Student, Department of Civil and Environmental Engineering, Hankyong National University, Anseong, Korea
a한경국립대학교 건설환경공학부 교수
b한경국립대학교 건설환경공학부 박사과정
*Corresponding Author
31 August 2025. pp. 625-636
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Abstract

As extreme rainfall and flood events have become more frequent due to climate change, conventional flood management strategies centered on artificial structures are increasingly facing limitations. In response, Nature-based Solutions (NbS) have emerged as viable alternatives. This study quantitatively evaluated the effects of two structural NbS approaches—floodplain storage and channel widening. Using the 2020 flood event in the Seomjin River as a case study, a one-dimensional unsteady flow model was developed with HEC-RAS. The analysis of peak water level changes at seven main locations showed that floodplain storage reduced flood stages by up to 0.91 m, while channel widening achieved a maximum reduction of 0.29 m. Notably, water levels at high-risk sites that previously exceeded design thresholds were stabilized, although localized increases in flood levels were observed in some areas. These results suggest that, when properly designed and applied, both methods can serve as effective NbS strategies for flood mitigation and provide practical insights for future flood management and river restoration planning.

Keywords
Nature-based Solutions (NbS)
Floodplain storage
Channel widening
Flood control
Seomjin River basin

최근 기후변화로 인한 극한강우와 홍수 발생이 빈번해지면서, 기존 인공 구조물 중심의 홍수 대응 방식은 한계를 보이고 있다. 이에 따라, 자연기반해법(Nature-based Solutions, NbS)이 대안으로 주목받고 있으며, 본 연구는 그 중 천변저류지(floodplain storage)와 하도 확폭(channel widening)의 적용 효과를 정량적으로 분석하였다. 2020년 섬진강 본류의 홍수사상을 대상으로 HEC-RAS 1차원 수리모형을 구축하고, 7개 지점에서 첨두 수위 변화를 분석한 결과, 천변저류지는 최대 0.91 m, 하도 확폭은 최대 0.29 m의 수위 저감 효과를 나타냈다. 특히 일부 위험 지점에서는 기준 수위를 초과하던 수위가 안정화되는 성과가 나타났으며, 국지적 수위 상승과 같은 역효과도 일부 구간에서 관찰되었다. 이러한 결과는 두 기법이 적절한 조건과 설계 하에 효과적인 NbS 수단이 될 수 있음을 보여주며, 향후 홍수 대응 및 하천 복원 계획 수립에 실질적인 기초자료로 활용될 수 있을 것이다.

키워드
자연기반해법
천변저류지
확폭
홍수 조절
섬진강 유역
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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 : 58
  • No :8
  • Pages :625-636
  • Received Date : 2025-03-31
  • Revised Date : 2025-06-05
  • Accepted Date : 2025-06-09
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.8.625
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