降雨誘發坡地二次崩塌之研究

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降雨诱发坡地二次崩塌之研究

Study of Rainfall-induced Secondary Landslide

吕宜静 , 硕士　　导师：陈怡睿　　

繁体中文

坡地崩塌；二次崩塌；卫星影像判释；地理资讯系统； landslide ； secondary landslide ； satellite image interpretation ； geographic information system

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摘要 │ 参考文献 (64) │ 国际计量

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Taiwan is located in subtropical regions with changing climate. In the summer, typhoons often bring concentrated heavy rain, and then cause a lot of sediment disaster, such as landslides, slippery, and debris flow due to Taiwan’s steep terrain and fragile geology. Furthermore, secondary landslide could happen in existing landslide sites, causing more serious impact. Therefore, if we can effectively assess the rainfall-induced secondary landslide, it is bound to reduce the damage caused by the disaster.
The study area in this research is the Nanhua Dam watershed in the southern Taiwan. The FORMOSAT satellite images before and after the years 2009-2013 (including 4 typhoons and 5 rainfall events) were acquired and used. The satellite images were interpreted to obtain surface information and hazard log data. Coupled with digital elevation model, the spatial analysis module in the geographic information system was employed to extract the ridges and rivers in study area. This study explored the relationship among rainfall, slope disturbance, and landslide, and characteristics of landslide distribution.
The results of image classification for 14 satellite images show that the average value of coefficient of agreement is 0.77 at medium-high level. The results show that number and area of bare land increase after rainfall, most of the rainfall-induced secondary landslide sites are near the ridge top, and most of the medium-large landslides extend toward the low end of the stream. Furthermore, for every rainfall event, landslides are induced when degree of slope disturbance is greater than 1.5. For greater rainfall event, larger scale landslides start to induce when degree of slope disturbance is greater than 2.5. For smaller rainfall event, landslides are induced for large slope disturbance.
The results also show that the number and scale of secondary landslide are more than that of new landslide. Most of larger-scale secondary landslide sites are near the ridge top. The greater the slope land disturbance, the more likely it is that the scale of secondary landslide become greater. The scale of secondary landslide increases when degree of slope disturbance reaches 1.6. Rainfall-induced secondary landslides are substantially located in slope from 20˚ to 35˚.

参考文献 ( 64 ) 〈TOP〉

1.互动国际数位股份有限公司(2011)，ArcGIS 10基础学习与应用宝典，新北市：新文京开发。
连结：
2.方思怡(2014)，高风险灾害潜势土地分类之研究-以曾文水库集水区为例，硕士论文，国立成功大学都市计画研究所，台南。
连结：
3.江介伦(2013)，气候变迁对台湾年降雨冲蚀指数潜在影响，地理学报，第68期，1-17。
连结：
4.何宇丽(2014)，降雨诱发山崩潜势与崩塌分布之研究，硕士论文，长荣大学土地管理与开发学系硕士班，硕士论文，台南。
连结：
5.李嵘泰、张嘉琪、詹勳全、廖佩妤、洪雨柔(2012)，应用罗吉斯回归法进行阿里山地区山崩潜势评估，中华水土保持学报，43(2)，167-176。
连结：

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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。