UAS thermal imagers for monitoring and analysing landslide in a mudstone area
UAS thermal imagers for monitoring and analysing landslide in a mudstone area
Typhoon activities lead to numerous rainfall-induced erosions, debris flows, and landslides. Monitoring and analysing potential natural disasters are needed worldwide. Thermal imagers are characterized by noncontact and long- distance detection capabilities, rendering them suitable for landslide monitoring. The purpose of the study was to monitor the unstable slope in a mudstone area by analyzing surface infrared temperature changes. A landslide case in a mudstone area in southern Taiwan was monitored for this pilot study. Thermographs obtained by a handheld thermal imager from various times were analyzed for monitoring the surface temperature changes on slope faces. In addition, an unmanned aerial system (UAS) mounted thermal imager was used to capture digital orthophoto thermal images for setting up a three- dimensional monitoring net. Infrared temperature changes per unit time served as monitoring variables and were compared with isotherms for detecting infrared temperature changes. These images indicated that wet soil had higher water content and exhibited a lower surficial infrared temperature change. A thermal imager can reveal changes in surface radiation temperatures and can be used for monitoring landslide-induced surface temperature changes. Accordingly, the use of thermal imagers for potential unstable slope monitoring may be optional.
H. W. Chen; C. Y. Chen; Y. Y. Liu
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
B - Geohazards
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