The Changchun Shrine, located in the Taroko National Park in eastern Taiwan, was built in 1958 and has been damaged three times by rockfalls. An engineering project was launched to mitigate the influence of rockfalls and enhance the safety of tourists visiting the shrine. Airborne LiDAR and two types of ground-based LiDAR were utilized to acquire point clouds of topography and outcrops nearby the shrine. High-resolution point cloud data can be used not only to interpret the large-scale geological linearities, erosion gullies and scarps, but also the attitudes of ubiquitous discontinuity sets to find the potential rock wedge. Statistical hypothesis testing is used to validate the representativeness of the interpreted attitudes of discontinuity sets, which are used in stereographic projection analysis of possible rock wedge movement and related design for rockfall protection measures.

INTRODUCTION

The Changchun Shrine was built in 1958 to commemorate the workers who constructed No. 8 Highway and died in the line of duty. The shrine is a well-known tourist site within the Taroko National Park, eastern Taiwan, associated with beautiful cliffs and perennial waterfalls. A zigzag trail crosses steep slopes behind the Changchun Shrine. However, geological conditions in the vicinity of the shrine, formed in two geological units, are unfavourable for engineering due to the occurrence of several sets of joints, leading to frequent landslides on varying scales. The first serious disaster occurred in 1980 and damaged the first-generation Changchun Shrine. The second-generation Changchun Shrine was rebuilt after three years, and the second serious disaster occurred in 1987. The third-generation Changchun Shrine was opened to public access in 1997, with several rockfalls being observed in 2015. Figure 1 shows the three generations of the Changchun Shrine.

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