為能了解水庫集水區內,可能發生崩塌地災害之潛在地區,防止水庫淤積,本研究結合ArcView與GIS技術,建立崩塌地潛感因子之地理資料庫,利用不安定指數法,計算各影響因子之權重,再應用GIS之套疊分析功能,製作水庫集水區崩塌地潛感圖,並加以評估。 從衛星影像資料所判釋之新增崩塌地結果發現,各颱風降雨事件不論是在空間分佈狀況或者崩塌數量和規模皆呈現明顯差異。敏督利颱風事件新增崩塌地主要發生在集水區中部,海棠颱風事件之新增崩塌地於空間分佈則較為平均。研究結果顯示,四個潛感因子之權重大小依序為土地利用、高程、地質、坡度。以地形因子而言,崩塌主要分布於坡度30°~40°及高程250公尺至1500公尺處,地質因子主要分佈在達邦層,土地利用因子則主要集中在草生地。不安定指數法對崩塌地之潛感分析,可以有效客觀量化各因子間之權重,進而求得崩塌地之潛感值,本研究將崩塌潛感圖區分為三個潛感區域經由兩個颱風事件交互檢核驗證,証實此崩塌潛感圖確實可作為災害防治初步預測之用。
The aim of the study is to estimate the risk distribution of landslide for the reservoir effectively and to provide the references to the supervisor of the reservoir watershed. The method of this study is using ArcView and GIS technique to build the geological database of potential instability factors for landslide. We adopt the dangerous value method to calculate the weight for each factor that affects the landslide. Alongside using the techniques provided by GIS on the spatial overlapping method is to make and estimate the landslide susceptibility maps. From the satellite image, we discovered that there is an obvious difference in the rainfall of Typhoon and space distribution, number of collapse, and seriousness of collapse. The collapses caused by Mindulle typhoon mainly take place at center of watershed. Haitang typhoon show a more average distribution of space and collapse area. Through landslide and influence factor, we can classify collapses situation. Then calculate each factor’s weight by landslide distribution. Each factor we can sort in large to small as follow: land-using, height, geology and slope. And we classify three degree of landslide: low, medium, height.By the research, Height and Land Use have lager influence to stability. Finally we draw the trendof collapsing map for government departments.
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