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2025 Vol.58, Issue 12 Preview Page

Review Article

Analysis of flood inundation simulation according to terrain resolution and interpolation methods

지형 해상도 및 보간 기법에 따른 홍수범람 모의 특성 분석

Mieun Kima
,
Suhyung Jangb
,
Shinuk Kangc
,
Hyungu Choid*
김 미은a
,
장 수형b
,
강 신욱c
,
최 현구d*
aPrincipal Researcher, Water Resources & Environmental Research Center, K-water Research Institute, Daejeon, Korea
bHead Researcher, Water Resources & Environmental Research Center, K-water Research Institute, Daejeon, Korea
cHead Researcher, Water Resources & Environmental Research Center, K-water Research Institute, Daejeon, Korea
dPrincipal Researcher, Water Resources & Environmental Research Center, K-water Research Institute, Daejeon, Korea
aK-water연구원 수자원환경연구소 책임연구원
bK-water연구원 수자원환경연구소 수석연구원
cK-water연구원 수자원환경연구소 수석연구원
dK-water연구원 수자원환경연구소 책임연구원
*Corresponding Author
31 December 2025. pp. 1379-1393
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Abstract

The frequency of floods caused by extreme weather events is increasing, and accurate flood innundation information is required when establishing related plans to mitigate flood damage. Accurate flood inundation information is essential for developing plans to minimize flood damage. In flood inundation analysis, the resolution of topographic data is the most critical factor. This study interpolated river channel terrain using cross-sectional survey data from river master plans, and refined the topographic data by subdividing grids along levee lines and river centerlines in RAS Mapper. To compensate for the absence of measured data, the two-dimensional HEC-RAS model was validated using design flood discharge. A comparison of inundation areas before and after channel interpolation, classified by water depths above and below 2 meters, revealed approximately 96% reduction in high-depth areas (≥2 m) and approximately 93% reduction in low-depth areas (<2 m). These results demonstrate that flood inundation analysis outcomes vary significantly depending on whether topographic information of the river channel is incorporated, highlighting the importance of direct and indirect model calibration and verification processes. This study is expected to enable more accurate identification of high-risk areas when establishing flood risk management plans, thereby preventing flood damage in advance.

Keywords
Flood inundation analysis
HEC-RAS 2D
DEMs
Interpolation of channel topography
Mesh refinement

극단적 이상 기후로 인한 홍수의 빈도는 증가하는 추세이고, 홍수로 인한 피해를 저감시키기 위하여 관련 계획 수립 시 정확한 홍수범람 정보가 필요하다. 홍수범람 분석은 지형자료의 해상도가 가장 중요한 요소이다. 본 연구는 RAS Mapper에서 하천기본계획 수립 시의 횡단측량 자료를 이용하여 하도 구간 내 지형을 보간하고, 제방선과 하천 중심선을 따라 격자를 세분화하여 지형자료를 생성하였다. 실측 자료의 부재를 보완하기 위해 하천의 계획홍수량을 적용하여 2차원 HEC-RAS 모형을 검증하였다. 하도구간 보간 전과 후의 침수범위를 수심 2 m 이상과 미만으로 구분하여 침수면적을 비교한 결과, 2 m 이상의 고수심에서는 약 96% 감소하였고 2 m 미만 저수심에서는 약 93% 감소하였다. 이는 홍수범람 분석 시 하도 구간의 지형 정보에 반영 유무에 따라 범람 범위의 분석 결과가 상이함으로 직·간접적 모형의 검보정 단계가 중요하다. 본 연구를 통해 향후 홍수 위험에 대한 계획 수립 시 보다 정확한 위험지역 선정으로 범람으로 인한 피해를 사전에 예방할 수 있을 것으로 기대한다.

키워드
홍수범람해석
2차원 HEC-RAS
수치표고모델
하도지형 보간
격자 상세화
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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 :1379-1393
  • Received Date : 2025-10-14
  • Revised Date : 2025-11-11
  • Accepted Date : 2025-11-15
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.12.1379
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