Seasonal surface fluctuation of a slow-moving landslide detected by multitemporal interferometry (Mti) on the huafan university campus, northern taiwan
Journal
Remote Sensing
Journal Volume
13
Journal Issue
19
Date Issued
2021
Author(s)
Abstract
A slow-moving landslide on the Huafan University campus, which is located on a dip slope in northern Taiwan, has been observed since 1990. However, reliable monitoring data are difficult to acquire after 2018 due to the lack of continuous maintenance of the field measurement equipment. In this study, the multitemporal interferometry (MTI) technique is applied with Sentinel-1 SAR images to monitor the slow-moving landslide from 2014–2019. The slow-moving areas detected by persistent scatterer (PS) pixels are consistent with the range of previous studies, which are based on in situ monitoring data and field surveys. According to the time series of the PS pixels, a long period gravity-induced deformation of the slow-moving landslide can be clearly observed. Moreover, a short period seasonal surface fluctuation of the slow-moving landslide, which has seldom been discussed before, can also be detected in this study. The seasonal surface fluctuation is in-phase with precipitation, which is inferred to be related to the geological and hydrological conditions of the study area. The MTI technique can compensate for the lack of surface displacement data, in this case, the Huafan University campus, and provide information for evaluating and monitoring slow-moving landslides for possible landslide early warning in the future. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Subjects
Gravity-induced deformation
Huafan University campus
Multitemporal interferometry (MTI)
Seasonal surface fluctuation
Slow-moving landslide
Interferometry
Landslides
Monitoring
Pixels
Synthetic aperture radar
Huafan university campus
Interferometry technique
Multi-temporal
Multitemporal interferometry
Northern Taiwan
Surface fluctuations
University campus
Deformation
Type
journal article