| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 105 === To assess the potential of a large-scale landslide, it is necessary to obtain geological information for the landslide site through site investigation, including aerial interpretation, field geology survey, geophysics tests and borehole exploration. However, the implementation of geological surveys usually consumes a lot of time and manpower. Geological information access is often exposed to rugged terrain in a large-scale landslide; it is difficult to obtain geological information in the inaccessible areas such as cliffs and deep valleys.
Lately, light-weight unmanned aerial vehicles (UAV) equipped with cameras or image sensors have been widely used because of its high mobility and low cost. This thesis adopts commercial UAV as a research tool and utilizes the UAV-photogrammetry methods to improve the efficiency of geological survey in a site of large-scale landslide. The produced UAV photogrammetry includes aerial photos, three-dimensional point cloud, digital surface models, and ortho-images. In this thesis, five possible geological survey applications are planned according to various types of data. These applications include the following: (1) the thickness estimation of colluvium; (2) the orientation determination of rock discontinuities; (3) the micro-photography interpretation, measurement and mapping; (4) the volume estimation of erosion and accumulation; and (5) the assessment of terrain change. For each application, a series of processes are carried out: (1) flight planning and data application, (2) site selection, (3) testing and analysis, and (4) result demonstration for UAV application in geological survey.
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