應用LiDAR進行崩塌地潛在土砂量評估－以鐵立庫崩塌地爲例

Using LiDAR on the Estimation of Potential Sediment Yields for Landslide-A case in Tieliku Landslide

許振崑(C. K. Hsu) ； 林伯勳(B. S. Lin) ； 冀樹勇(S. Y. Chi) ； 黃文洲(W. C. Huang) ； 尹孝元(H. Y. Yin)

《水保技術》 5卷4期 (2010/10) Pp. 205-215

https://doi.org/10.30040/JSWCT.201010.0002

摘要

崩塌地調查除可利用遙測手段進行判釋外，亦可透過現地調查及地形量測等方式，以瞭解崩塌原因與潛在土方等特性。自艾利颱風後，石門水庫集水區崩塌多以小型崩塌爲主，但大型崩塌往往是造成大量土砂產量之來源，故本研究以抬耀溪上游鐵立庫大型崩塌地爲例，進行地表地質調查及地球物理探測，並結合地面LiDAR技術，據以估算潛在不穩定土方量、研判土壤與岩盤交界面及監測地表變形。經分析顯示，鐵立庫崩塌地坡度陡峻、地質破碎，並斷層線通過，加速地表風化速度，岩土交界面最大厚度深至10m，不穩定土方仍有0.63萬立方公尺。透過本文建議此項綜合調查方式，初步可掌握崩塌區位內土砂變動量及崩壞特性，供以作爲集水區崩塌地整治參考。

關鍵字

石門水庫 ； 鐵立庫崩塌地 ； 地球物理探測 ； 土砂產量

並列摘要

Landslide can be depended on remote sensing methodology to identify the size and also field investigation and terrain measurement to find out the causes and estimate sediment yield on the hillslopes. After Typhoon Aere, lost of small landslides occur in the Shih-men watershed. But few big landslides contribute mainly amounts of sediment yield. In view of these points, this study takes big Tieliku landslide as a case to do field investigation and geophysical exploration incorporating with ground LiDAR scanning for evaluating sediment yield, the variation of slope displacement and interface between rock and water. It is found that Tieliku landslide still has potential sediment volume about 0.63*104 m^3 and thickness of colluvium layer approaching to 10m due to a motion of fault and weakness of geology. From the above the study can preliminarily understand the variation of sediment yield and its failure characteristic. Furthermore, the investigated experience can provide the mitigation strategy similar to the type of landslide.

並列關鍵字

Shih-Men Watershed ； Tieliku Landslide ； Geophysical Exploration ； Sediment Volume