Journal of Korean Society of Disaster and Security (한국방재안전학회논문집)

Korean Society of Disaster & Security (한국방재안전학회)
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Study on the Inundation at the Merging Area of Osipcheon and Local Stream Using a Two-Dimensional Model

2차원 모형을 이용한 삼척오십천 소하천 합류 지점 침수해석에 관한 연구

  • Do Jin Kim (Graduate School of Disaster Prevention, Kangwon National University) ;
  • Kye Won Jun (Graduate School of Disaster Prevention, Kangwon National University)
  • 김도진 (강원대학교 방재전문대학원) ;
  • 전계원 (강원대학교 방재전문대학원)
  • Received : 2023.12.13
  • Accepted : 2023.12.23
  • Published : 2023.12.31
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Abstract

In this study, we analyzed the flooded area around Samcheok Middle School caused by typhoons MAYSAK·HAISHEN in September 2020. To analyze the confluence of Samcheok Osipcheon, local stream Deungbongcheon, we utilized Iber, a two-dimensional hydraulic model. We simulated the water depth and flood extent based on the peak flows on September 3 and September 7, 2020, and the 80 year and 100 year frequency floods. The simulation results showed that the 80-year frequency flood and the 100-year frequency flood on September 7 were insignificantly different, but the maximum flow rate from September 3 to September 7 was significantly different at 401 m3/s, resulting in a difference of 0.8 m in water depth and 7.1 m2 in flood area. In addition, the analysis that considered only the contour lines using contour lines predicted inundation of not only the Samcheok Middle School playground but also the building, confirming the need to apply DSM.

본 연구에서는 2020년 9월 태풍 마이삭·하이선으로 인한 침수가 일어난 삼척중학교 주변을 분석하였다. 삼척 오십천과 소하천인 등 봉천 합류 지점의 침수특성을 분석하기 위해 2차원 수리 모형인 Iber를 적용하였다. 연구에서는 2020년 9월 3일과 9월 7일의 최대유량 및 80년, 100년 빈도 홍수량을 기반으로 침수 깊이와 침수 범위를 모의하였다. 모의 결과, 9월 7일에는 80, 100년 빈도 홍수량에서 미미한 차이를 나타냈으나, 9월 3일에서 9월 7일에 최대 유량 차이가 401 m3/s로 나타나 침수 깊이에서는 0.8 m, 침수 범위에서는 7.1 m2의 상당한 차이를 보였다 또한, DEM을 이용한 등고선만을 고려한 분석에서는 삼척중학교 운동장뿐만 아니라 건물까지 침수가 예측되어 고정밀 지형자료인 DSM의 적용이 필요함을 확인하였다.

Keywords

Acknowledgement

This paper work (or document) was financially supported by Ministry of the Interior and Safety as Human Resource Development Project in Disaster Management.

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