Integrated Flood Risk Mitigation Measures for the Naengcheon River Basin Against Climate Change: A Case Study of Typhoon Hinnamnor

Tae Jung Jung; Kye Won Jun; Sung Soo Lee; Kwang Ki Kim

doi:10.21729/ksds.2025.18.2.37

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Original Article

Integrated Flood Risk Mitigation Measures for the Naengcheon River Basin Against Climate Change: A Case Study of Typhoon Hinnamnor 기후변화 대응을 위한 냉천 유역 치수대책 연계방안 연구: 태풍 힌남노 사례를 중심으로

30 June 2025. pp. 37-47

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Abstract

Climate change has increasingly intensified the frequency and magnitude of extreme rainfall events. In addition, rapid urbanization and unregulated land development have expanded impervious areas, leading to greater surface runoff and worsening flood damages. In urban and industrial regions where rivers pass through dense developments, traditional flood control measures based solely on levees and river channels are no longer sufficient to manage flood discharges that exceed design standards. Therefore, watershed based structural flood control measures such as dams and reservoirs are required. This study focuses on the Naengcheon River Basin in Pohang City, South Korea, which experienced severe flooding during Typhoon Hinnamnor in 2022. Using observed rainfall data, flood discharges were estimated, and an integrated flood management strategy was developed to distribute flood control between river channels and upstream facilities. Structural alternatives including washlands, flood detention reservoirs (dam), bypass, and combined operation of a new dam and the existing Reservoir were evaluated. The results provide practical guidance for establishing climate adaptive flood risk management plans and infrastructure, especially in medium sized urban watersheds. This case study offers useful insights for integrated planning of river and watershed-based flood mitigation.

Keywords

Climate change

Urbanization

Typhoon Hinnamnor

Watershed based flood management measures

Flood discharge estimation

Structural flood control measures

Combined reservoir operation

전 세계적으로 심각한 문제로 대두되고 있는 기후변화는 집중호우의 빈도와 강도를 증가시키고 있으며, 여기에 도시화와 무분별한 개발로 인한 불투수면적 확대는 유출량 증가와 피해 심화를 초래하고 있다. 특히 대규모 시가지 및 산업단지를 통과하는 하천의 경우, 제방 중심의 기존 하도 대응 치수대책만으로는 치수계획빈도를 초과하는 홍수에 대응하는 데 한계가 있다. 이에 따라 유역 중심의 구조적 홍수대책(댐, 저수지 등)이 필요하다. 본 연구는 2022년 경상북도 포항시 냉천 유역을 강타한 태풍 힌남노를 사례로, 실측 강우량을 기반으로 홍수량을 산정하고, 하도와 유역 간 통합적 치수대책을 수립하였다. 천변저류지, 홍수조절지, 방수로, 신규 댐 ‧ 기존 저수지 연계운영 등의 구조적 대안을 검토하였으며, 하천과 유역 간 홍수 분담을 고려한 실질적인 대응전략을 제시하였다. 연구 결과는 향후 중소도시 유역의 기후위기 대응형 방재계획 수립 및 치수 인프라 구축을 위한 실무적 기준으로 활용될 수 있다.

키워드

기후변화

도시화

태풍 힌남노

유역 중심 치수대책

홍수량 산정

구조적 홍수대책

저수지 연계운영

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Information

Publisher :Korean Society of Disaster and Security
Publisher(Ko) :한국방재안전학회
Journal Title :Journal of Korean Society of Disaster and Security
Journal Title(Ko) :한국방재안전학회 논문집
Volume : 18
No :2
Pages :37-47
Received Date : 2025-06-18
Revised Date : 2025-06-25
Accepted Date : 2025-06-26
DOI :https://doi.org/10.21729/ksds.2025.18.2.37

Journal of Korean Society of Disaster and Security ISSN:2466-1147(Print) 2508-285X(Online) 한국방재안전학회 논문집

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Korean References Translated from the English