POTENTIAL LANDSLIDE DETECTION BASED ON SENTINEL-1 DATA AND INSAR TECHNOLOGY IN LEBAK DISTRICT, BANTEN

• Main Author: Mulia Pangestika, Dita
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/87041
• Institution: Institut Teknologi Bandung

Lebak Regency is one of the regions in Indonesia that has a high frequency of landslides. One of the controlling factors that play an important role is the morphological shape of the plateau with steep slopes. Landslides cause economic, physical, environmental losses and even fatalities. Therefore, an effective approach is needed to detect and monitor ground movement over a wide area for disaster risk mitigation. This research aims to identify potential landslide areas in Lebak Regency using remote sensing method based on Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) and LiCSBAS data processing package. Sentinel-1 image data was processed with the SBAS-InSAR technique to detect land movement in the 2018-2023 time span. The interferogram data process produced a ground motion velocity map. The analysis of ground movement velocity, slope map, and image coherence has resulted in the identification of potential landslide locations in Lebak Regency. A total of 1,467 potential landslide locations were found, with the highest number of points in Cibeber Sub-district (75 points) and the lowest in Banjarsari, Cirinten, and Cimarga Sub-districts (1 each). Using the coherence value of the image, the polygon of landslide area was determined in Lebakgedong and Cikulur sub- districts. In terms of landslide anatomy characteristics, Lebakgedong Sub-district exhibited a fall type landslide in Banjarsari Village and a flow type landslide in Banjaririgasi Village, while Cikulur Sub-district showed a creep landslide type. Furthermore, the ground movement velocity analysis revealed that the highest soil depletion velocity in Lebak District reached -110 mm/year. Overall, these findings provide valuable information for understanding the potential landslide risks in Lebak Regency.