Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events
In this study, we develop a dimensionless assessment method to evaluate landslide dam formation by considering the relationship between the run-out distance of a tributary debris flow and the width of the main stream, deposition thickness of the tributary debris flow, and the water depth of the main...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2019/7083058 |
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| author | Kun-Ting Chen Xiao-Qing Chen Gui-Sheng Hu Yu-Shu Kuo Yan-Rong Huang Chjeng-Lun Shieh |
| author_facet | Kun-Ting Chen Xiao-Qing Chen Gui-Sheng Hu Yu-Shu Kuo Yan-Rong Huang Chjeng-Lun Shieh |
| author_sort | Kun-Ting Chen |
| collection | DOAJ |
| description | In this study, we develop a dimensionless assessment method to evaluate landslide dam formation by considering the relationship between the run-out distance of a tributary debris flow and the width of the main stream, deposition thickness of the tributary debris flow, and the water depth of the main stream. Based on the theory of debris flow run-out distance and fan formation, landslide dam formation may result from a tributary debris flow as a result of two concurrent formation processes: (1) the run-out distance of the tributary debris flow must be greater than the width of the main stream, and (2) the minimum deposition thickness of the tributary debris flow must be higher than the in situ water depth of the main stream. At the confluence, one of four types of depositional scenarios may result: (1) the tributary debris flow enters into the main stream and forms a landslide dam; (2) the tributary debris flow enters into the main stream but overflow occurs, thus preventing complete blockage of the main stream; (3) the tributary debris flow enters into the main stream, does not reach the far bank, and sediment remains partially above the water elevation of the main stream; or (4) the tributary debris flow enters into the main stream, does not reach the far bank, and sediment is fully submerged in the main stream. This method was applied to the analysis of 11 tributary debris flow events during Typhoon Morakot, and the results indicate that the dimensionless assessment method can be used to estimate potential areas of landslide dam formation caused by tributary debris flows. Based on this method, government authorities can determine potential areas of landslide dam formation caused by debris flows and mitigate possible disasters accordingly through a properly prepared response plan, especially for early identification. |
| format | Article |
| id | doaj-art-5d3e8fddb937454e8d03562ce8f345c3 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-5d3e8fddb937454e8d03562ce8f345c32025-02-03T06:08:15ZengWileyGeofluids1468-81151468-81232019-01-01201910.1155/2019/70830587083058Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow EventsKun-Ting Chen0Xiao-Qing Chen1Gui-Sheng Hu2Yu-Shu Kuo3Yan-Rong Huang4Chjeng-Lun Shieh5Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaKey Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaKey Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaDepartment of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 70101, TaiwanDepartment of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 70101, TaiwanDepartment of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 70101, TaiwanIn this study, we develop a dimensionless assessment method to evaluate landslide dam formation by considering the relationship between the run-out distance of a tributary debris flow and the width of the main stream, deposition thickness of the tributary debris flow, and the water depth of the main stream. Based on the theory of debris flow run-out distance and fan formation, landslide dam formation may result from a tributary debris flow as a result of two concurrent formation processes: (1) the run-out distance of the tributary debris flow must be greater than the width of the main stream, and (2) the minimum deposition thickness of the tributary debris flow must be higher than the in situ water depth of the main stream. At the confluence, one of four types of depositional scenarios may result: (1) the tributary debris flow enters into the main stream and forms a landslide dam; (2) the tributary debris flow enters into the main stream but overflow occurs, thus preventing complete blockage of the main stream; (3) the tributary debris flow enters into the main stream, does not reach the far bank, and sediment remains partially above the water elevation of the main stream; or (4) the tributary debris flow enters into the main stream, does not reach the far bank, and sediment is fully submerged in the main stream. This method was applied to the analysis of 11 tributary debris flow events during Typhoon Morakot, and the results indicate that the dimensionless assessment method can be used to estimate potential areas of landslide dam formation caused by tributary debris flows. Based on this method, government authorities can determine potential areas of landslide dam formation caused by debris flows and mitigate possible disasters accordingly through a properly prepared response plan, especially for early identification.http://dx.doi.org/10.1155/2019/7083058 |
| spellingShingle | Kun-Ting Chen Xiao-Qing Chen Gui-Sheng Hu Yu-Shu Kuo Yan-Rong Huang Chjeng-Lun Shieh Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events Geofluids |
| title | Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events |
| title_full | Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events |
| title_fullStr | Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events |
| title_full_unstemmed | Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events |
| title_short | Dimensionless Assessment Method of Landslide Dam Formation Caused by Tributary Debris Flow Events |
| title_sort | dimensionless assessment method of landslide dam formation caused by tributary debris flow events |
| url | http://dx.doi.org/10.1155/2019/7083058 |
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