Statistical Analysis of Tree Growth Directions at a Landslide Site near the Mt. Houshanyue Hiking Trail

• Main Authors: Ya-Lan Chung, 鐘雅蘭
• Other Authors: 陳偉堯
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/8w9fge

碩士 === 國立臺北科技大學 === 土木與防災研究所 === 98 === Taiwan is located in the Pacific Rim earthquake belt and the sub-tropical climate zone. Its special geographical environment is vulnerable to natural disasters, notably typhoons, plum rain, and climate change. This study uses a terrestrial laser scanner to collect the data of tree trunks and conducts the regression analysis of tree growth directions at the landslide site near the Mt. Houshanyue hiking trail. Moreover, the study collects the climate data and satellite imagery (from 2002 to 2008) for statistical analysis. The statistical data of rainfall reveals that in recent years, intense rainfall has become more and more common which results in the large-scale collapse in the Mt. Houshanyue hiking trail in 2008. This study collects the point cloud data of trees from laser scanning for archival purposes. The image files can be used for further studies. By analyzing the point cloud data of growth directions of the collected trees, it shows that the growth directions of trees are not random but with specific orientations. According to the statistical data from five statistical stages, the trees on the upper slope indicate a turn toward the north. The 95% confidence intervals are as follows: -13°-25°, -40°-38°, -33°-26°, -48°-18° and -28°-37°. According to the statistical data from six statistical stages, the trees on the lower slope mostly indicate a turn toward the southwest. The 95% confidence intervals are as follows: 220°-245°, 227°-265°, 228°-268°, 206°-243°, 224.79°-270.55° and 200°-256°. Therefore, the study result indicates that the growth directions of trees can be used to study landslide conditions while providing a database for disaster prevention studies.