Journal of Korean Society of Disaster and Security (한국방재안전학회논문집)

Korean Society of Disaster & Security (한국방재안전학회)
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Detection of Levee Displacement and Estimation of Vulnerability of Levee Using Remote Sening

원격탐사를 이용한 하천 제방 변위량 측정과 취약지점 선별

  • 방영준 (홍익대학교 토목공학과) ;
  • 정효준 (홍익대학교 토목공학과) ;
  • 이승오 (홍익대학교 토목공학과)
  • Received : 2021.02.01
  • Accepted : 2021.03.21
  • Published : 2021.03.31
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Abstract

As a method of predicting the displacement of river levee in advance, Differential Interferometry (D-InSAR) kind of InSAR techniques was used to identify weak points in the area of the levee collapes near Gumgok Bridge (Somjin River) in Namwon City, which occurred in the summer of 2020. As a result of analyzing the displacement using five images each in the spring and summer of 2020, the Variation Index (V) of area where the collapse occurred was larger than that of the other areas, so the prognostic sysmptoms was detected. If the levee monitoring system is realized by analyzing the correlations with displacement results and hydrometeorological factors, it will overcome the existing limitations of system and advance ultra-precise, automated river levee maintenance technology and improve national disaster management.

하천 제방 변위를 사전에 예측하는 방안으로 본 연구에서는 InSAR 기법 중 Differential Interferometry(D-InSAR) 기법을 이용하여 2020년 여름 발생한 남원시 금곡교(섬진강) 인근의 제방 붕괴 지역에서 취약지점을 확인하였다. 2020년 봄과 여름 각각 5장의 sentinel-1 영상과 위성 영상 전처리 도구인 SNAP을 사용하여 2020년 8월 8일 제방 붕괴 전까지의 발생한 변위를 분석한 결과, 붕괴 발생 지역의 변위 변동성지수(Variation Index), V 가 상대적으로 크게 발생하였으며 이를 통해 붕괴 전조증상을 확인할 수 있었다. 향후에 산출한 변위를 분석한 결과와 유역의 지하수위, 기온, 수위, 토양도 및 토양 수분도와 같은 수문기상학적 요인과 상관관계를 분석하여 하천 제방의 모니터링 시스템을 구축할 수 있다면 기존의 하천 제방 유지·보수 점검 시스템의 많은 한계점을 극복하고 초정밀, 자동화된 하천 제방 유지관리 기술 고도화와 국가 재난관리의 향상이 가능할 것으로 기대한다.

Keywords

Acknowledgement

본 결과물은 교육부의 재원으로 홍익대학교의 대학혁신지원사업(UROP)의 지원을 받아 연구되었으며, 자문을 주신 산업체 전문가 H2R 소속의 제갈선동 박사님께 감사드립니다.

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