Investigation of mass wasting in the vicinity of Khao Kho, central Thailand using time – series InSar technique

Abstract

The application of time-series InSAR has been employed for investigation of mass wasting in the Khao Kho and Phetchabun mountain range. The objective of this study is to Investigation of mass wasting by SAR data between 2015 to 2018 and classification of mass wasting by displacement rate millimeter/year. This study using active remote sensing data, which is Synthetic Aperture Radar (SAR) satellite imagery from Sentinel-1A and Sentinel-1B satellites. Result from PSInSAR analysis yielded a total of 7,354 PS points for ascending orbit, and 8,984 PS point for descending orbit. The average ground displacement rate result from ascending orbit is 65.19 millimeters per year, while displacement rate from ascending orbit is 13.97 millimeters per year. The classifying obtained displacement rates using the criteria for categorizing mass wasting type by other research, it was found that the observed mass wasting characteristics in study area dominant by Creep movement, particularly PS points in urban areas. Then, the result of this study comparing with landslide susceptibility data, slope stability map, debris flow-flood susceptibility data and Landslide inventory. This research result presents a correspond with the slope stability map. in the other hand, landslide susceptibility data, debris flow-flood susceptibility data and Landslide inventory give a little of relation due to velocity and factor of occurring between Creep and landslide are quite different.