台灣位於歐亞板塊和菲律賓海板塊的交界帶以及太平洋的颱風路徑上，在地質和氣候條件的雙重作用下，致使台灣地區崩塌事件頻仍。本研究以陳有蘭溪集水區為例，探討降雨和地文因子對集水區坡面崩塌之影響。在崩塌地資料方面，本研究蒐集了研究區域中，經由福衛影像判識而得的崩塌面積資料，一共包含了三場颱風事件(海棠颱風、辛樂克颱風，以及莫拉克颱風)，再以冪次定律探討研究區域內崩塌地的自組織臨界性的問題。從資料的分析中發現，本研究所探討的崩塌地共有1,981個，且主要集中發生在具有陡峭的坡度，以及林班地和草生地等區域。而經由冪次分析的結果顯示，陳有蘭溪集水區的坡面崩落具有自組織臨界性的現象，同時本研究亦將崩塌資料依照不同的降雨事件，和地文因子(包含坡度、高程、土地利用)進行分類，以探討在不同條件下，崩塌發生的頻率-規模分佈特性，結果顯示，岩石強度、土地利用，以及降雨條件對於崩塌的發生均扮演了重要的角色。本研究為集水區崩塌災害的風險經營管理提供了一些重要的資訊，可作為相關單位之參考依據。

The frequency-magnitude distribution of landslides in the Chenyulan watershed, central of Taiwan has investigated comprehensively. Landslide data was collected from three extreme rainfall events, Typhoons Haitang, Sinlaku, and Morakot via the detection of Formosa Satellite Images with detailed field checking. A total of 1,981 landslides were obtained from the three data sets, which where mainly located in steep slope areas covered with forest land and range land. Our results showed that the frequency-magnitude distribution of the landslides exhibits a power-law behavior, indicate that the collapsing hill slope has Self-organized criticality in the Chenyulan watershed. Moreover, a total of 1,981 landslides were categorized into different groups based on physiographic factors (e.g., gradient, elevation, and land use) and discussed the power-law relations in each landslide group to understand the behavior and the complexity network of landslide occurrence. Analysis of the landslide area and its corresponding probability density of landslide area showed that each physiographic and rainfall factors were connected and highly related with the landslide occurrence. Soil and rock strength, land use and rainfall condition has an important roles in the occurrence of landslide. This study provided useful information in the assessment of landslide hazard and risk in advance.

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