An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths
Numerical scenario simulation may serve as an efficient and powerful tool for hazard assessment, but it often suffers from the lack of a definite failure surface before the occurrence of failure. In the present study, an idealized curved surface (ICS) is proposed for mimicking the sliding surface in...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-08-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/article/10.3389/feart.2020.00313/full |
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| author | Yih-Chin Tai Chi-Jyun Ko Kun-Ding Li Yu-Chen Wu Chih-Yu Kuo Rou-Fei Chen Ching-Weei Lin |
| author_facet | Yih-Chin Tai Chi-Jyun Ko Kun-Ding Li Yu-Chen Wu Chih-Yu Kuo Rou-Fei Chen Ching-Weei Lin |
| author_sort | Yih-Chin Tai |
| collection | DOAJ |
| description | Numerical scenario simulation may serve as an efficient and powerful tool for hazard assessment, but it often suffers from the lack of a definite failure surface before the occurrence of failure. In the present study, an idealized curved surface (ICS) is proposed for mimicking the sliding surface in the numerical simulation. Different from the conventional Sloping Local Base Level (SLBL) or Scoops3D method, this idealized surface consists of two curvatures, which are defined in the down-slope and cross-slope directions, respectively. Applying this idealized surface to 45 historical landslides of sliding type in southern Taiwan, two specific relations of geometry (length, curvature radius, and depth) in the down-slope and cross-slope directions are figured out. These specific relations simplify the complexity of constructing the idealized curved surface for areas prone to landslides for the sake of hazard assessments. That is, once the area with landslide susceptibility is identified and the associated released volume is given, the idealized sliding surface can be uniquely determined with the help of these geometric relations. The proposed method is integrated with a two-phase grain-fluid model and numerically validated against a historical large-scale landslide for investigating its feasibility. Although the idealized failure surface may deviate from that determined by the post-event investigation, it is interesting to note that the major discrepancy is mainly found at the first stage. The differences (both flow thickness and paths) reduce over time, and only minor discrepancies can be identified at the deposition stage. These findings reveal the weak co-relation between the geometry of the failure surface and the flow paths. It also indicates the feasibility of the ICS for predicting the flow paths by scenario investigation, especially when the exact sliding surface of a landslide is not available. |
| first_indexed | 2024-12-14T10:40:27Z |
| format | Article |
| id | doaj.art-ce3df718d62d41818114a2c378d66559 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-14T10:40:27Z |
| publishDate | 2020-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-ce3df718d62d41818114a2c378d665592022-12-21T23:05:43ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632020-08-01810.3389/feart.2020.00313539212An Idealized Landslide Failure Surface and Its Impacts on the Traveling PathsYih-Chin Tai0Chi-Jyun Ko1Kun-Ding Li2Yu-Chen Wu3Chih-Yu Kuo4Rou-Fei Chen5Ching-Weei Lin6Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, TaiwanDepartment of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, TaiwanDepartment of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, TaiwanDepartment of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, TaiwanCenter of Applied Sciences, Academia Sinica, Taipei, TaiwanDepartment of Geology, Chinese Culture University, Taipei, TaiwanDepartment of Earth Sciences, National Cheng Kung University, Tainan, TaiwanNumerical scenario simulation may serve as an efficient and powerful tool for hazard assessment, but it often suffers from the lack of a definite failure surface before the occurrence of failure. In the present study, an idealized curved surface (ICS) is proposed for mimicking the sliding surface in the numerical simulation. Different from the conventional Sloping Local Base Level (SLBL) or Scoops3D method, this idealized surface consists of two curvatures, which are defined in the down-slope and cross-slope directions, respectively. Applying this idealized surface to 45 historical landslides of sliding type in southern Taiwan, two specific relations of geometry (length, curvature radius, and depth) in the down-slope and cross-slope directions are figured out. These specific relations simplify the complexity of constructing the idealized curved surface for areas prone to landslides for the sake of hazard assessments. That is, once the area with landslide susceptibility is identified and the associated released volume is given, the idealized sliding surface can be uniquely determined with the help of these geometric relations. The proposed method is integrated with a two-phase grain-fluid model and numerically validated against a historical large-scale landslide for investigating its feasibility. Although the idealized failure surface may deviate from that determined by the post-event investigation, it is interesting to note that the major discrepancy is mainly found at the first stage. The differences (both flow thickness and paths) reduce over time, and only minor discrepancies can be identified at the deposition stage. These findings reveal the weak co-relation between the geometry of the failure surface and the flow paths. It also indicates the feasibility of the ICS for predicting the flow paths by scenario investigation, especially when the exact sliding surface of a landslide is not available.https://www.frontiersin.org/article/10.3389/feart.2020.00313/fulllandslideslope failurefailure surfaceidealized curved surface (ICS)flow pathshazard assessment |
| spellingShingle | Yih-Chin Tai Chi-Jyun Ko Kun-Ding Li Yu-Chen Wu Chih-Yu Kuo Rou-Fei Chen Ching-Weei Lin An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths Frontiers in Earth Science landslide slope failure failure surface idealized curved surface (ICS) flow paths hazard assessment |
| title | An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths |
| title_full | An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths |
| title_fullStr | An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths |
| title_full_unstemmed | An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths |
| title_short | An Idealized Landslide Failure Surface and Its Impacts on the Traveling Paths |
| title_sort | idealized landslide failure surface and its impacts on the traveling paths |
| topic | landslide slope failure failure surface idealized curved surface (ICS) flow paths hazard assessment |
| url | https://www.frontiersin.org/article/10.3389/feart.2020.00313/full |
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