Landslide Monitoring and Potential Assessment from Differential Interferometric Radar Analysis and Ground Instrumentations

Kuo-Lung WANG, Jun-Ting LIN, Yi-Hsuan LEE, Li-Wen CHEN, Jheng-Ru LAI, Tsung-Wen CHEN, Yo-Ming HSIEH, Meei-Ling LIN, Ray-Tang LIAO, Chao-Wei CHEN and Ching-Weei LIN

Typhoons and earthquakes attack Taiwan every year even by month. Landslide hazard mitigation is very important in hazard prevention chain. Synthetic aperture radar images acquired by JAXA (Japan) are used in this research to monitor landslide displacement in large area. The study is trying to propose a method to produce landslide potential map from differential interferometric synthetic aperture radar (DInSAR). Small baseline subset (SBAS) is adopted for higher accuracy. This method searches points with the same radar signal strength through observing years and keep tracking locations in each scene. The RMS error directly from radar shows 10mm with 95% confidence. MEMs accelerometer with tilt and dynamic signal are also collected for ground motions. However, locale tilt or acceleration cannot reflect overall deformation. Thus a single/dual frequency GPS system is also installed in study area. The result of one monitoring landslide during a heavy rainfall event in June, 2017. The results also proved that SBAS method derived displacement map.

2018/1 24-31