Abstract
Abstract. Due to abnormal weather caused by climate change in recently years, natural disaster damages caused by local torrential rains have been increased over the world. Particularly, Korea is very vulnerable to landslide disasters because more than 63% of the country is mountainous and it suffers from unpredictable localized heavy rainfall during monsoon season every year. This paper presents experimental results for risk assessment of steep slope using drone mapping and terrestrial LiDAR survey. First, we acquired the aerial imagery of steep slope site by small UAV and conducted a drone mapping process with the Pix4D software. For collecting the more detailed geological data and analysing quantitatively damage of steep slopes (crack length, bedrock weathering area, etc.), we scanned steep slope area using terrestrial LiDAR system. Finally, we evaluated the applicability of public safety for outputs of UAV photogrammetry and 3D point clouds derived from terrestrial LiDAR data to analyse and assess the risk of steep slope.
Highlights
Due to abnormal weather by climate change recently, natural disaster damages caused by heavy rains have been increased over the world
We evaluated the applicability of public safety for outputs of Unmanned Aerial Vehicles (UAVs) photogrammetry and 3D point clouds derived from terrestrial LiDAR data to analyse and assess the risk of steep slope
A UAV photogrammetry technique using a small drone was applied to take close-up aerial imagery of the natural slopes of steep slopes that are difficult to access directly by the investigator and to acquire and analyse spatial information on the top of slope or around the slope that are difficult to be obtained by terrestrial LiDAR (Figure 6)
Summary
Due to abnormal weather by climate change recently, natural disaster damages caused by heavy rains have been increased over the world. Due to the topographical characteristics of the Korean peninsula and the rainy season front formed with a narrow width in the east-west directions and a long shape in the north-south directions, natural disasters caused by localized heavy rain are occurring nationwide. Increase, the collapse of steep slopes and damage from landslides have become major damage factors, accounting for about 26% of the deaths from natural disasters in the last 10 years. The steep slope is defined as follows: firstly, natural slopes and artificial slopes (including retaining walls, ledges, etc.) attached to residential land, roads, railroads and park facilities, or secondly, a mountainous area in contact with them, 1) an artificial slope with a height of 5m from the ground and a slope of 34 degrees, and a length of 20m. Regular inspection is conducted as a way of precautionary activities before the rainfall period of Korea, focused on the field investigation using the advanced investigation platform such as UAVs, Terrestrial LiDAR etc
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