台東太麻里集水區崩塌因子之研究

The landslide factor in Taitung Taimali River Watershed

謝依霖(Yi-Lin Hsieh)

指導教授 ： 李錦育

國立屏東科技大學/工學院/水土保持系所/碩士(2015年)

https://doi.org/10.6346/NPUST.2015.00007

摘要

臺灣位於板塊交界處，東部地質較為破碎且地震頻繁，加上地理位置關係，颱風經常侵襲臺灣且攜帶豪大雨量，易使山區發生山崩、地滑、土石流等災害，嚴重威脅坡地居民生命及財產安全。2009年8月莫拉克颱風挾帶高強度降雨，在東部地區造成嚴重崩塌災害，太麻里流域之總崩塌面積高達2,501公頃。本研究以相關分析和主成份分析，探討地文因子及水文因子與崩塌地之關係。研究結果顯示：地文因子方面，有77.2%崩塌皆小於1ha，且崩塌高程多介於500~1,500m之間；水文因子方面，因地理位置之關係，太麻里集水區流域上游與下游之雨量觀測值相差約1,000mm，顯示太麻里集水區上游雨量充沛，致使該地區之崩塌地多位於中、上游；綜合各因子對崩塌地之影響，致使本研究區崩塌地發生之主要因子為降雨因素。

關鍵字

崩塌 ； 降雨 ； 地文因子 ； 莫拉克颱風

並列摘要

As Taiwan is located at the compressed plate, bad geologic setting and frequent earthquake in eastern. And Taiwan is located in the passing route of typhoon, it often carry torrential rainfalls, which cause landslide, debris flow, and mudflow. These horrible disasters seriously threaten the safety of the residents live and property. Typhoon Morakot struck Taiwan in August 2009, it carry high intensity and long-duration rainfalls and caused serious landslide disaster damage in Taitung, the Taimali watershed landslide area up to 2,501 ha. In this study, according to Correlation Analysis and Principal Component Analysis explore the geographic and hydrologic factors relations of landslides. In this study, according to Correlation Analysis and Principal Component Analysis explore the geographic factor and hydrologic factors relations of landslides. The results show, 77.2% landslide area are less than 1 ha, and between landslide elevation at 500~1,500m. Hydrological factors, the result of geographical relations, rainfall observations of Taimali watershed upstream and downstream of difference about 1,000mm, Show Taimali upstream watershed plenty of rainfall, causing landslides were located in the midstream and upstream. The combined effects of various factors on the landslide, resulting in the occurrence of the major are rainfall factor.

並列關鍵字

Landslide ； Rainfall ； Geographic factor ； Typhoon Morakot

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