Detection and Mapping of Active Landslides before Impoundment in the Baihetan Reservoir Area (China) Based on the Time-Series InSAR Method

Many potential landslides occured in the Baihetan reservoir area before impoundment. After impoundment, these may still slide, affecting safe operation of (e.g., causing barrier lakes and floods). Identifying locations their distribution pattern has attracted attention China globally. In addition, due to rolling terrain area, synthetic aperture radar (SAR) imaging will affect interactive (InSAR) deformation results. Only by obtaining effective information can active be accurately identified. Therefore, banks Hulukou Xiangbiling section impoundment Jinsha River Basin were studied this paper. Using data satellite parameters from Sentinel-1A ascending descending orbits ALOS PALSAR orbit, line-of-sight visibility was quantitatively analyzed, an analysis method proposed. Based on SAR analysis, small baseline subset (SBAS) technique used process acquire deformation. InSAR combined with Google Earth imagery identify 25 landslides. field verification, 21 (14 new) determined. Most are controlled faults, strata other relatively weak. This based provide a reference for identifying analyzing complicated terrain.