Journal of Korean Society of Disaster and Security (한국방재안전학회논문집)

Korean Society of Disaster & Security (한국방재안전학회)
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Conveyance Verification through Analysis of River Vegetation and Soil Impact using Sentinel-2

Sentinel-2를 활용한 하천의 식생 및 토양 영향 분석을 통한 통수능 검정

  • Bang, Young Jun (Dept. of Civil & Environmental Engineering, Hongik Univ.) ;
  • Choi, Byeong Jun (Dept. of Civil & Environmental Engineering, Hongik Univ.) ;
  • Lee, Seung Oh (Dept. of Civil & Environmental Engineering, Hongik Univ.)
  • 방영준 (홍익대학교 건설환경공학과) ;
  • 최병준 (홍익대학교 건설환경공학과) ;
  • 이승오 (홍익대학교 건설환경공학과)
  • Received : 2021.12.06
  • Accepted : 2021.12.20
  • Published : 2021.12.31
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Abstract

Flooding damage may occur due to an unexpected increase in rainfall in summer. Previously, the roughness coefficient, which is a major factor of conveyance, was calculated through on-site measurement, but in case of on-site measurement, there are many limits in accurately grasping changes in vegetation. In this study, the vegetation index (NDVI) was calculated using the Sentinel-2 optical images, and the modified roughness coefficient was calculated through the density and distribution area of the vegetation. Then the calculated roughness coefficient was applied to HEC-RAS 1D model and verified by comparing the results with the water level at the water level station directly downstream of the Soyang River dam. As a result, the error rate of the water level decreased about 14% compared to applying the previous roughness coefficient. Through this, it is expected that it will be possible to refine the flood level of rivers in consideration of seasonal flood characteristics and to efficiently maintain rivers in specific sections.

여름철 예상치 못한 급격한 강우량의 증가로 침수 피해가 발생할 수 있으며 이 때, 하천 내 식생에 의해 통수능이 감소할 경우 제방 월류와 같은 침수의 위험성이 증가하게 된다. 기존에는 현장실측을 통해 통수능의 주요인자인 조도계수를 산정하고 있지만, 현장 실측의 경우 식생의 변화를 정확하게 파악하는데 많은 한계가 존재한다. 본 연구는 Sentinel-2 광학 이미지를 활용하여 식생지수(NDVI)를 산정하고 식생의 밀도와 분포면적을 통해 세분화된 조도계수를 산출하였다. 산출한 조도계수를 HEC-RAS 1D모의에 적용하여 소양강 댐 직하류를 대상으로 수위 관측소 수위와 결과를 비교하여 타당성을 검증하였다. 분석 결과 기존 조도계수 적용 결과보다 위성영상을 통해 산정한 세분화된 조도계수 적용 수위가 오차율이 약 14% 감소하였다. 이를 통해 계절에 따른 홍수량 특성을 고려한 하천의 홍수위의 정교화와 특정 구간에 효율적인 하천 정비가 가능할 것으로 기대한다.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No.2021R1A2C2013158).

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