Measurement of Ground Subsidence in Mokpo Area from Radar Intrerferometry

영상레이더를 이용한 목포 지반침하 관측

  • 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)
  • 김상완 (세종대학교 지구정보공학과, 지질재해정보연구실) ;
  • 김창오 (세종대학교 지구정보공학과, 지질재해정보연구실) ;
  • 원중선 (연세대학교 지구시스템과학과) ;
  • 김정우 (세종대학교 지구정보공학과, 지질재해정보연구실)
  • Published : 2005.08.01

Abstract

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.

Keywords

Mokpo;Subsidence;JERS-1;SAR;DInSAR;PSInSAR

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