利用崩塌潛勢圖作風險評估之應用－以陳有蘭溪流域為例

Landslide Hazard Evaluated by a Landslide Susceptibility Map-A Case Study of Chenyulan River Basin

楊明德(Ming-Der Yang) ； 黃奕達(Yi-Da Huang) ； 黃凱翔(Kai-Hsiang Huang) ； 張益祥(Yi-Hsinag Chang)

《中華水土保持學報》 43卷1期 (2012/03) Pp. 1-11

https://doi.org/10.29417/JCSWC.201203_43(1).0001

摘要

本研究利用衛星影像和數值高程模型（DEM）擷取出地形、地質、區位三大因子資料，利用不安定指數法分析地形、地質、區位三大因子，計算其變異係數和標準差以求得權重，將所有因子依權重套疊製成崩塌潛勢圖以評估崩塌程度，並結合保全對象資料進一步做風險評估。陳有蘭溪流域為中部地區重點災害防治溪流，本研究利用陳有蘭溪流域之數值高程模型，將集水區依崚線切分成各子集水區，套疊崩塌圖與保全對象資料進行保全因子之評分，再將各子集水區潛勢予以分級，評估其災害風險程度。研究成果指出陳有蘭溪流域中，最須優先處置之區域集中在同富村及神木村，依此能提供區域治理順序評估之依據。

關鍵字

崩塌潛勢 ； 子集水區 ； 保全對象 ； 不安定指數

並列摘要

Satellite images and the Digital Elevation Model (DEM) can extract three major factors, such as topographic data, geologic patterns, and the location of the environment, in the instability index. The landslide susceptibility map illustrates the risk of landslides by computing landslide factors through a Geographic Information System (GIS). In this study, the instability index was applied to analyze the risk of landslides. DTM and aerial photographs of Chenyulan river watershed were employed. This research considered the landslide susceptibility and the scoring protected targets to estimate the risk of landslides for each sub-watershed in Chenyulan river. The result of this research shows, in the Chenyulan river watershed, Shenmu and Tongfu villages are currently the top priority for setting up a mitigation strategy and regulations.

並列關鍵字

Landslide susceptibility ； sub-watershed ； protected target ； instability index