Application of global satellite navigation system and telemetry image analysis technology to assess activity of potential large-scale landslide in forest land area – a case study on Taoyuan district no. D346, Kaohsiung city

Abstract

The investigation, monitoring, and prevention of large-scale landslides, also known as deep seated landslides, are important research topics for slope disaster prevention. Some national forest land managed by the Forestry Bureau is located at the upstream watershed area, which has relatively unstable geological and topographical factors, and there are major large-scale landslides. However, those areas with protected objects are still the priority for investigation, governance, and management. There are 14 large-scale landslides with high and moderate risk located in the region of the Pingtung Forest District Management Office. For the implementation of future disaster prevention practices, the most important thing is to evaluate the activities of the large-scale landslides. This study takes Kaohsiung City-Taoyuan District-D346 as an example. The scars/linear structures in the potential area of a large-scale landslide are identified using high resolution LiDAR DEM. On-site global satellite navigation system monitoring and multi-sequence telemetry images are conducted to understand the activity and sliding direction of the block, meaning that the surface activity of the potential large-scale landslide area can be monitored. There are number of mature technological developments recently. Compared with the funding for underground geological exploration and subsequent project management, the funding for surface activity assessments with multiple telemetry images and monitoring equipment is relatively simple, after checking the activity of the large-scale landslide, the high resolution of LiDAR DEM, aerial photography and satellite images are the perfect tools to be applied before the follow-up key treatment and management funds are invested.