자원환경지질 (Economic and Environmental Geology)

  • 제38권4호
  • /
  • Pages.381-394
  • /
  • 2005
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
권호 표지

영상레이더를 이용한 목포 지반침하 관측

Measurement of Ground Subsidence in Mokpo Area from Radar Intrerferometry

  • 김상완 (세종대학교 지구정보공학과, 지질재해정보연구실) ;
  • 김창오 (세종대학교 지구정보공학과, 지질재해정보연구실) ;
  • 원중선 (연세대학교 지구시스템과학과) ;
  • 김정우 (세종대학교 지구정보공학과, 지질재해정보연구실)
  • Kim Sang-Wan (Division of Marine Geology and Geophysics, Univ.) ;
  • Kim Chang-Oh (Dept. of Geoinformation Eng. & Geohazard Information Lab., Sejong University) ;
  • Won Joong-Sun (Dept. of Earth System Sciences, Yonsei University) ;
  • Kim Jeong Woo (Dept. of Geoinformation Eng. & Geohazard Information Lab., Sejong University)
  • 발행 : 2005.08.01
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초록

목포시는 한반도 서남쪽에 위치한 연안도시로, 시 면적의 약 $70\%$가 바다를 매립하여 이루어진 도시이다. 매립에 의한 지반침하 현상이 여러 지역에서 빈번하게 보고되고 있음에도 불구하고 정량적인 관측이 거의 이루어지지 않았다. JERS-1 L밴드 SAR 위성에서 얻어진 26개의 영상을 이용하여 1992년 9월 25일부터 1998년 10월 4일 사이 목포시에서 발행한 침하량을 측정하였다. JERS-1 SAR 영상과 SRTM 3초 DEM을 이용하여 60여개의 간섭도를 작성하였다. 간섭도 관측결과 동명동, 하당동, 원산동 일대에서 지속적인 침하가 발생하였으며, 주요 침하 지역에서 침하속도는 4 cm/yr를 넘는 곳도 있다. 시간에 따른 침하 양상에 대한 분석을 보다 용이하게 하기 위해 고정산란체(PS)를 이용한 분석기법도 적용하였으며, 결과적으로 JERS-1 SAR 자료의 각 관측 시기에 대한 지표변위도를 구하였다.

Mokpo city is a coastal city located at the south western coast of the Korean Peninsula. Large regions within Mokpo are subjected to significant subsidence because about $70\%$ of the city area is a reclaimed land from the sea. Although no confidential quantitative measurements are available up to the present, the subsidence rate is as much as several cm per year. In this study, we aimed to estimate the subsidence rate over Mokpo city by using twenty-six JERS-1 SAR dataset from September 1992 to October 1998. Several tens of differential interferograms were processed from JERS-1 dataset and STRM 3-arc DEM. The results indicate continuous subsidence in Dongmyung-dong, Hadang-dong and Wonsan-dong in city, and the subsidence velocity reach over 4 cm/yr in the most highly sinking area. For facilitating the analysis of time-varying surface change, we also carried out an interferometric SAR time series analysis using permanent scatterer and consequently determined space-time maps of surface deformation at each acquisition time of JERS- 1 SAR.

키워드

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