Investigation of disasters in The river basin of Kaohsiung-Pingtung area

• Main Authors: Jyh-Hui Lan, 藍志輝
• Other Authors: Chia-Cheng Fan
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/21784708009767461892

碩士 === 國立高雄第一科技大學 === 營建工程所 === 98 === Natural disasters are preventable, but at some costs. Viewed from this perspective, past typhoons have brought people in Taiwan valuable lessons besides huge casualties and losses. The research is focused on Jiasian mainly on account of its geographical uniqueness. For one thing, it is on the Southern Cross-Island Highway; for another, it is at the south end of Yushan Range and Alishan Range, facing Central Mountain Range on the east with Qishan River running through. Furthermore, sited between Hojue River on the west and Laonong River on the east, Jiasian is formed by many west-to-east sections. Plate movement has contributed to the many faults that scatter about. Southern Taiwan was ravaged by succeeding typhoons in 2008 and 2009, and Jiasian was among the most damaged areas. After observing and recording the landslide, flooding, and rivers changing their courses on the spot, I am deeply impressed with the power of water, which inspires me to choose water-related factors such as rainfall, catchment area, and average slope to analyze how rivers are formed. Next, I position the destructed area through GPS and mark the area on Google Earth map. With the area converted by Google Earth map to the Google topographic diagram, I then draw the catchment area and average slope to get their data. The data is then taken to EXCEL through LOG and applied with liner regression analysis to get an equation, which is found to fit in with fractal theory. It is proved that the factors fit in with fractal theory. I then move on to the topographic diagram of Qishan River, dividing it into areas to get the data of catchment area and average slope. The equation is applied to the data to make a diagram of curve on EXCEL. Its curve goes above the equation. It can be concluded that the equation is a demarcation line; it also stands for the strike of rivers.