南投縣信義鄉神木村，自1996年7月賀伯颱風引發重大土石流災害後，每逢夏季的颱風或豪雨期間便容易發生土石流災害。為瞭解神木集水區內土砂材料的供應狀態，本研究欲透過數位影像相關法分析集水區內邊坡的活動性，並找出具有高位移潛勢的區塊，再根據現地調查資料及GIS地形分析討論具潛勢區塊的易致災因素。本研究利用多期PlanetScope光學衛星影像及數位影像相關法(Digital Image Correlation, DIC)分析2017年4月至2022年4月期間愛玉子溪及出水溪集水區內邊坡的地表位移速率，根據不同時期邊坡的活動性圈繪出重複位移區塊，發現多數區塊位於裸露地及源頭區，並有少部分區塊位於植披覆蓋的區域，顯示該方法能有效找出無法直接觀察到的位移區塊。為了更細緻地討論具不同地質、地形或水文條件的邊坡地表位移狀況，本研究將愛玉子溪及出水溪流域劃分成多個坡面單元，並從中找出具有明顯地表位移的區塊，結果顯示，具有高潛勢的坡面單元包含以下幾種特徵：坡度較陡、裸露地面積多、受溪流侵蝕影響。最後，為瞭解數位影像相關法的準確性及影像品質對分析結果的影響，本研究使用桃園市復興區光華大規模崩塌潛勢區的UAV正射影像進行分析，並與當地GPS觀測資料進行比較，結果顯示若分析影像解析度較高，影像相關性分析結果的數據會更為精準。本研究主要透過數位影像相關法分析並計算集水區內地表位移速率，並推算出土石流潛勢溪流源頭區及沿岸邊坡提供土石材料的潛能，以提供作為後續評估防災發生潛勢的參考。

Shenmu Village in Xinyi Township, Nantou County, has experienced recurrent landslide disasters during summer typhoons and heavy rainfall events since a major landslide disaster in July 1996. This study aims to analyze slope mobility and identify blocks with high displacement potential in the Shenmu watershed using Digital Image Correlation method (DIC). Field survey data and GIS terrain analysis are utilized to examine the disaster-prone factors of potential blocks. Multi-period PlanetScope optical satellite images and DIC are employed to analyze the surface displacement rate of slopes in the Aiyuzi River and Chushui River catchment areas from April 2017 to April 2022. Results show that most displacement blocks are concentrated in bare land and the source area, indicating the effectiveness of the DIC method in identifying areas that cannot be directly observed. Additionally, the study subdivides the catchment areas into smaller sections to further investigate the surface displacement of slopes with varying geological, topographical, and hydrological conditions. The findings highlight characteristics of high potential areas, such as steep slopes, extensive bare land, and susceptibility to stream erosion. The accuracy of the DIC method is evaluated using UAV orthophoto images, revealing that higher analysis image resolutions yield more accurate results. This study provides valuable insights into surface displacement rates and the potential for land-rock flows, offering reference for subsequent disaster prevention evaluations.

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