Landslide Susceptibility Mapping for Different Scale

• Main Authors: Hou-Ren Peng, 彭厚仁
• Other Authors: Ming-Lang Lin
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/19204768631824960815

碩士 === 國立臺灣大學 === 土木工程學研究所 === 104 === The research aim is the manufacturing of potential map in different criterion of slope stability in the Tian Gul Creek Basin slate region. The research is based on possible failure types under different scale plan of slope, and establishes methodology of map production. A 1/50000 geological map means that every 500 meters of distance should consist of one state. Based on its resolution, the average area 25 hectares decides the size of a slope unit. However, as a 25-hectare slope unit area, its internal aspect and state information still show a great deal of differences, thus cannot fully explain the type of a slope failure. Moreover, the damage of slate slope is influenced by the gravitational creep and the plane of weakness on the joint. Hence, considering the making of large-scale engineering geology map along with the future project planning and design, this research chose a micro-scale slope to analyze, in hope to find the actual damage condition of the smallest slope unit for future reference. Object Oriented Analysis software eCognition that produces slope unit in object form compares past correlate researches with the result by segmentation process built by its own rules. Sky-view map inputs one-river watershed frame layer in the beginning, and it is the biggest difference of all. Since the large reduction of time that river thresholds and build watershed frame from Geographic Information System (GIS) results from Sky-View map, we can tell the distinction of the water system and ridge line from the DTM in different resolution. In order to understand the destruction of slope, GCPS on the two sides of the slopes was built in 2016 and DSM was produced by UAV completed by point coordinates token from total station. The 5m DTM and self-made DSM were compared to create the downstream of Tian Gul Creek based on Object Oriented Analysis. Then the two parts of representative were chosen to find out the different resolution. Finally, the four different scales were displayed, namely 1/50000, 1/25000, 1/5000 and 1/1000.