莫拉克颱風於陳有蘭溪流域之災害調查

Disaster Investigation in Chenyulan River Basin during Typhoon Morakot

10.29417/JCSWC.200912_40(4).0004

楊明德(Ming-Der Yang)；林基源(Ji-Yuan Lin)；林蔚榮(Wei-Jung Lin)；黃凱翔(Kai-Siang Huang)；吳東諺(Dong-Yan Wu)

莫拉克颱風 ； 災害調查 ； 陳有蘭溪流域 ； 土石流 ； 洪水災害 ； typhoon Morakot ； disaster investigation ； Chenyulan River basin ； debris flow ； flooding

中華水土保持學報

40卷4期（2009 / 12 / 01）

345 - 358

繁體中文

莫拉克颱風於2009年8月7日侵襲台灣，引發「八八水災」造成台灣中南部嚴重洪水災害。其中在南投縣陳有蘭溪流域發生數起洪水、土石流及大規模坡地滑動等重大災害事件。本研究調查陳有蘭溪流域之主要受災情形，特別針對三個重大災點進行說明，包括：1.新山村路基掏空壽山橋及20多戶民宅遭沖毀。2.信義鄉神木村隆華國小遭土石流沖毀。3.神木村因霍薩溪、和社溪數條支流發生集水區崩塌及土石流造成數萬立方土石下移，愛玉子溪橋沖毀，對外聯絡道路沖毀中斷。藉由對陳有蘭溪流域重大災點之災情說明以及整體流域特性考量，歸納由長至短期之災害成因分析（包含1.地質及地形因素；2.921集集大地震；3.人類活動；4.極端降雨影響等因素）。期能爲災後復建工程提供有效資訊，並作爲未來檢討陳有蘭溪流域整體性治山防洪關鍵問題與長期防災策略擬定之參考。

Typhoon Morakot struck Taiwan on August 7(superscript th), 2009, causing severe flood disasters in central and southern Taiwan, and was dubbed the ”88 Flood”. Serious flooding, debris flows, and landslides also occurred in Chenyulan River basin in Nantou County. In this article, disaster investigations are presented for three serious disaster areas: (1) Shou-San bridge where more than 20 houses were destroyed in Shin-San village; (2) Long-Hua elementary school was damaged; and (3) Aiyuzhi creek bridge was washed away by debris flow. Further, the causes of these serious disasters are discussed from four angles: (1) geology and topography; (2) Chi-Chi earthquake; (3) human activity; and (4) extreme rainfall. Based on the investigation and cause analysis, suggestions are given to establish a proper recovery plan and a disaster management strategy in Chenyulan River basin.