2009年莫拉克風災重創台灣中南部，在山區多處造成面積大於10公頃之大規模崩塌。為了防範類似的事件再次發生，所以需要更加了解影響大規模崩塌之可能因子。以往大規模崩塌的調查與研究著實不易，但近年來透過高精度光達數值地形能夠有效增加大規模崩塌之判釋速度與準確度。又因為大規模崩塌受控於地質因子，故本研究探討區域地質構造對大規模崩塌之影響。
本研究利用莫拉克風災前(2007)航空照片製作二公尺數值地形模型，配合災後(2010)中央地質調查所所提供的空載光達高精度數值地形模型，針對竹林崩塌比較前後期地形變化。利用航照配合空載光逹高精度數值地形進行崩塌之地形特徵和構造線型判釋，並透過野外調查檢核崩塌判釋結果，以及完成美瓏溪集水區大比例尺路線地質圖。其次，利用不同類型露頭之擦痕資料，嘗試區分崩塌類型滑動面與地質構造類型滑動面，最後綜合討論地質構造與崩塌間的關係。
潛在大規模崩塌判釋及檢核結果顯示，寶來竹林地區具大規模崩塌地形之特徵的崩塌地共18處，且美瓏溪南岸佈滿潛在大規模崩塌。地質調查方面，確認美瓏山斷層為一位態為（N50˚E,60˚E）、逆衝兼具左移性質，且斷層變形帶超過750公尺的逆衝斷層，利用野外岩性與構造資料，結合擦痕資料與構造線型判釋之結果，劃定美瓏山斷層下界，完成美瓏溪集水區路線地質圖。
綜合室內判釋與野外工作結果，寶來竹林地區發育大規模崩塌的主因為：美瓏山斷層變形帶使坡面岩體破碎，在巨觀尺度下接近均質，促使潛在大規模崩塌圓弧形底滑面之形成，並因為變形帶之阻水與匯水特性，使坡面孔隙壓增加，降低坡面穩定度，促使崩塌之發生。

When Typhoon Morakot hit central and southern Taiwan in 2009, it caused large scale landslide with area that is greater than 10 hectares in the mountains. In order to prevent similar incidents from happening again, so we need to understand the factors that impact the large scale landslide. In the past, the investigation of large scale landslide was not easy; however in the recent years, it has been a great progress discovering the usage of high-precision topographic LiDAR that could effectively cut down the time and increase the accuracy of the investigation. Because the geological factors controll the large-scale landslide, this study use the geologic mapping and the investigating of landslide featuring indoor and outdoor to discuss The impact of geological structure on the occurrence of large scale landslide.
First, With the aerial photos which were taken before the disaster of typhoon Morakot in 2009, the 2m digital elevation model was produced to match with the post-disaster LiDAR digital elevation model in 2010, provided by Central Geological Survey MOEA, in order to compare the topography before and after the disaster. Second, we use aerial photos and LiDAR digital elevation model to interpret the structural lineament and the feature of landslide-topography. Third, we do the field works to verificate the interpretation indoor and make the geological map of the Meilong Shan watershed. Fourth, we use the slickensildes, which were from different types of outcrop, to distinguish between the sliding surface of landslides and geological structures. Finally, we combined all the works to discuss the relationship between geological structures and landslides.
The investigation of potentially large scale landslide shows that there is eighteen sites of potentially large scale landslide in Baolai-Chulin area. Moreover, on the southern bank of Meilong River is covered with potential large scale landslide. In the field works, Meilong Shan fault is confirmed as a thrust fault which its attitude is (N50˚E, 60˚E), and the width of fault deformation zone is over 750 meters. This study combined the field data that contain the lithological data and structural data and the data of slikenside and the structual lineament to decide the boundary of Meilong Shan fault, and to complete the large scale geological map of Meilong Shan watershed.
Combining the results of the indoor works and field works, we think that the reason of the formation of large scale landslide in Baolai-Chulin area was the Meilong Shan fault deformation zone. Becauce Meilong Shan fault deformation zone, which fragments the rocks on the slop, cause the generating of listric detachment. And the deferent permeability of the deformation zone increases the pore pressure, and reduces the stability of slope, thereby promoting a the development of large scale landslide.

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