以數值地形及三維地質資訊評析石門水庫匹亞崩塌地

Assessment and Analysis the Pi-Ya Landslide in Shihmen Watershed by Using DEM and 3-D Geological Data

蕭震洋(Cheng-Yang Hsiao) ； 李易叡(Yi-Rui Lee) ； 周立生(Li-Sheng Chou)

《土木水利》 45卷3期 (2018/06) Pp. 34-44

https://doi.org/10.6653/MoCICHE.201806_45(3).0006

摘要

近年在全球氣候變遷影響下，造成極端天氣越趨顯著，使得臺灣山坡地之崩塌災害現象頻生。本文以石門水庫集水區匹亞崩塌地為例，使用高精度DEM判識崩塌地地表特徵；接著，使用PIV方法分析坡地潛在滑動量；再者，以不同期數值地形分析不穩定土砂所在區域及量體；最後，參考地質資料建立三維地質模型，分析崩塌之機制及可能成因。研究成果可提供政府相關單位後續治理或監測規劃之參考。

並列摘要

In recent years, under the influence of global climate change, extreme weather has become more and more obvious, resulting in the frequent landslides of hill slopes in Taiwan. This paper took the Pi-Ya landslide in Shihmen Reservoir watershed as an example, using high resolution DEM to identify landslide surface features. And the PIV method was used to analyze the potential slips on the hill slope. In addition, also compared the DEM in different periods to analyze the unstable sediment area and volume. Finally, this paper used geological data to establish a 3D geological model, analyzing the mechanism and potential causes of landslide. The research results can provide reference for government agencies as follow-up governance or monitoring plans.