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姓名 凡古源(Nguyen Trong Van)  查詢紙本館藏   畢業系所 應用地質研究所
論文名稱 海底地滑:台灣西南海域手掌海脊個案研究
(A Submarine Landslide Case Study from Palm Ridge, Offshore Southwestern Taiwan)
★ 利用GIS進行廣域山區順向坡至逆向坡 之判別與潛勢評估–以北橫地區為例★ 北橫公路復興至巴陵段岩石單壓強度之 初步預估模式
★ 車籠埔斷層北段之地下構造研究★ 以岩體分類探討非構造性控制破壞之 岩坡最陡安全開挖坡度
★ 異向性軟岩邊坡地下水滲流對孔隙水壓分佈影響之探討★ 軟弱沉積岩層滲透異向性之探討
★ 臺地邊緣復發式邊坡滑動之水文地質因素探討-以湖口臺地南緣地滑地為例★ 大型岩崩之潛勢與災害影響範圍之研究
★ 節理岩體滲透係數之先天異向性與應力引致異向性★ 比較集集地震引致紅菜坪地滑及九份二山地滑特性之研究
★ 斷層擴展褶皺之斷層破裂距離與斷層滑移量比值(P/S)力學特性之研究★ 土石流潛勢溪流特性分類
★ 孔隙水壓模式對紅菜坪地滑區穩定性之影響★ 紅菜坪地滑地崩積層-岩盤交界面孔隙水壓變化之監測與分析
★ 沉積岩應力相關之流體特性與沉積盆地之 孔隙水壓異常現象★ 山崩引致之堰塞湖天然壩穩定性之量化分析
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摘要(中) 海底地滑不只是控制海底地形和傳輸沉積物至深水環境中,且對人類生命有巨大的影響。手掌海脊位於被動和活動大陸邊緣之間,根據過去研究,這裡曾發生海底事件,這事件與歷史事件中1781/1782年海嘯事件有高度相關。然而,海底地滑的發生仍未被充分研究。基於高解析度多波束測探系統、反射震測剖面和海底淺層數據,本研究旨在確定研究區域內是否存在古代海底地滑。若地滑確實存在,就能建立地滑的3D模型。此外,無限邊坡穩定分析來評估地震的可能大小和天然氣水合物分解產生的超額孔隙壓力的量。上述兩者被認為是最合理的滑坡觸發因子,透過常用的ArcGIS和Fledermaus技術來預測和繪製地滑範圍,然後通過地球物理探勘數據驗證確定的範圍。並使用Topo to Raster插值演算法重建事件前地形。初步成果顯示,研究區域內曾發生巨大的海底地滑,其長度約為22公里,寬6公里,覆蓋總面積為90.76平方公里。破壞面的最大深度沿代表剖面為296公尺,平均深度為162公尺。此海底地滑釋出並沉積大量沉積物,估計體積分別為4.02和4.9立方公里。無限邊坡穩定分析法表明,觸發滑坡破壞所需的超額孔隙壓力為1044 kPa,所需的尖峰地面加速度範圍為0.11至0.28 g。
摘要(英) Submarine landslides do not only regulate the shape of the seafloor and transport sediment into the deep-water environment, but also have a significant influence on human life. Palm Ridge is an area located between passive and active continental margin. According to previous studies, there could be a submarine event occurred in this area. That event also considered highly related to the 1781/1782 tsunami event described in the historical records. However, the occurrence of that submarine landslide is still not well-studied. Based on the high-resolution multi-beam bathymetric, reflection seismic profiles and sub-bottom data, this study aims to confirm that whether there is an ancient submarine landslide in the study area or not. If the landslide does exist, then the 3D model for the proposed landslide will be built. In addition, an infinite slope stability analysis method will be applied to evaluate the possible magnitude of an earthquake and the amount of excess pore pressure resulting from gas-hydrate dissociation. They are considered as the most plausible landslide triggering factors. Utilizing the common use of ArcGIS and Fledermaus techniques, the range of landslide is predicted and mapped and then the identified range is validated by the geophysical prospecting data. The pre-event topography is also reconstructed by using Topo to Raster interpolation algorithm. The preliminary result shows that there is a huge submarine landslide occurred in the study area with the dimension of roughly 22 km length, 6 km wide and covering a total area of 90.76 km2. The maximum depth of the failure surface along the representative cross section is about 296 m and the average depth is 162 m. This submarine landslide released and deposited a huge amount of sediment with an estimated volume of 4.02 and 4.9 km3, respectively. The infinite slope analysis indicated that the required amount of excess pore pressure to trigger the failure of slope is 1044 kPa. And the required Peak Ground Acceleration ranges from 0.11 to 0.28g.
關鍵字(中) ★ 海底地滑
★ 邊坡穩定分析
★ 超額孔隙水壓
★ 地震
★ 天然氣水合物分解
關鍵字(英) ★ Submarine landslide
★ slope stability analysis
★ excess pore water pressure
★ earthquakes
★ gas hydrate dissociation
2.1. Research Data 10
2.2. Pre-event Topography Reconstruction 13
2.2.1. Geomorphology Analysis and Validation 14
2.2.2. Automatically Pre-event DEM Generation 15
2.2.3. Manually Adjustment of the Automatic Created DEM 16
2.2.4. Volume Balance 16
2.3. Back Analysis of Triggering Factors 17
2.3.1. Infinite and Finite Slope Stability Analysis 18
2.3.2. Back Analysis Input Parameters 20
2.3.3. Back Analysis of the Excess Pore Water Pressure 21
2.3.4. Back Analysis of the Peak Ground Acceleration 22
2.3.5. Correlation between Excess Pore Pressure and Horizontal Seismic Coefficient 23
2.4. Identification of Possible Earthquake Sources 24
3.1. Geomorphology Analysis and Validation 26
3.2. Automatically Pre-event DEM Generation 36
3.3. Manually Adjustment of the Automatic Created DEM 38
4.1. Sensitivity of effective cohesion force. 45
4.2. Comparison between Infinite and Finite Slope Stability. 46
4.3. Back Analysis of Excess Pore Water Pressure 46
4.4. Back analysis of Peak Ground Acceleration 48
4.5. Correlation between Excess Pore Pressure and Horizontal Seismic Coefficient 49
5.1. Identification of Possible Earth Sources 50
5.2. Submarine Landslide Susceptibility of the Neighboring Areas 56
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指導教授 董家鈞(Jia-Jyun Dong) 審核日期 2019-1-22
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