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2025 Vol.58, Issue 12S-4 Preview Page

Special Issue: 지능형 도시홍수 예측

HEC-RAS 2D-Based compound flood modeling in the Naengcheon Basin, a coastal urban area

HEC-RAS 2D를 이용한 냉천 유역 해안도시 복합 침수 모델링

Hyeri Janga
,
Jaehwan Yoob
,
Changhee Leec
,
Byunghyun Kimd*
장 혜리a
,
유 재환b
,
이 창희c
,
김 병현d*
aMaster’s Candidate, School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National University, Daegu, Korea
bPh.D Candidate, School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National University, Daegu, Korea
cProfessor, Department of Fire and Disaster Prevention, Jungwon University, Goesan, Korea
dProfessor, Department of Civil Engineering, Kyungpook National University, Daegu, Korea
a경북대학교 건설환경에너지공학부 석사과정
b경북대학교 건설환경에너지공학부 박사수료
c중원대학교 소방안전학과 교수
d경북대학교 건설환경에너지공학부 토목공학과 교수
*Corresponding Author
31 December 2025. pp. 1617-1627
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Abstract

This study validated the performance of the HEC-RAS 2D model for simulating urban flooding in the Naengcheon Basin of Pohang City during Typhoon Hinnamnor on September 6, 2022. The model was developed based on cross-sectional data from the river master plan, with two-dimensional computational domains defined for the main channel and adjacent low-lying areas. A 5 m resolution DEM and 163 manhole overflow locations were incorporated using GIS data. Boundary conditions were provided by runoff hydrographs estimated from HEC-HMS and sewer network outflows calculated by XP-SWMM. Model results were compared with CCTV footage, flood photographs, and previous studies. The maximum inundation depth (approximately 3-4 m) and the flood propagation process closely matched the observed flood conditions. At specific sites, simulated flood depths were within ±0.1-0.2 m of estimated values, indicating good model accuracy. Widespread shallow flooding (less than 0.5 m) was reproduced in residential areas, while severe inundation exceeding 2 m occurred near industrial complexes, roads, and underpasses. These results demonstrate that the HEC-RAS 2D model can effectively simulate compound flooding processes in urban catchments, even with relatively simplified input conditions, and highlight its academic and practical value for improving flood forecasting systems and supporting localized flood risk management strategies.

Keywords
HEC-RAS 2D
Coastal city
Compound flooding
Typhoon Hinnamnor
Naengcheon Basin

본 연구는 2022년 9월 6일 태풍 힌남노로 발생한 포항시 냉천 유역의 도시 침수를 대상으로, 하천 범람(외수)과 내수 침수를 동시에 고려한 HEC-RAS 2D 모형의 재현성을 검증하였다. 모형 구축은 하천 기본계획 단면을 기반으로 본류와 좌·우안 저지대에 2차원 해석 영역을 설정하고, DEM (5 m)과 주요 맨홀 월류량(163개소)을 GIS 기반으로 반영하는 방식으로 수행하였다. 입력자료는 기존에 산정된 HEC-HMS 유출량과 XP-SWMM 관망 해석 결과를 경계조건으로 적용하였다. 모의 결과는 CCTV 영상, 피해 사진 및 기존 연구와 비교·검토하였으며, 최대 침수심(약 3-4 m)과 침수 확산 과정이 실제 피해 상황과 유사하게 나타났다. 또한 지점별 추정 침수심은 모의값과 ±0.1-0.2 m 이내에 근접하여 신뢰성을 확보하였다. 특히 주거지 일대에서는 얕은 침수(0.5 m 이하)가 광범위하게 나타난 반면, 산업단지·도로·지하차도 인근에서는 국지적 심수 침수(2 m 이상)가 발생하였다. 이러한 결과는 HEC-RAS 2D 모형이 비교적 단순화된 입력조건에도 불구하고 도시부의 복합 침수를 효과적으로 재현할 수 있음을 보여주며, 향후 도시 홍수 대응을 위한 예·경보 체계 고도화와 국지적 방재 대책 수립에 활용될 수 있는 학술적·실무적 의의를 가진다.

키워드
HEC-RAS 2D
해안도시
복합침수
태풍 힌남노
냉천 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 :12
  • Pages :1617-1627
  • Received Date : 2025-09-18
  • Revised Date : 2025-11-05
  • Accepted Date : 2025-11-07
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.S-4.1617
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