Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully
Short-term heavy rainfall often causes large-scale rainstorm debris flows in mountainous areas of Southwest China. Aiming to investigate the accumulation and movement of potential source material for the formation of debris flow hazards under extreme short-term heavy rainfall, this paper takes the X...
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Frontiers Media S.A.
2023-12-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1257440/full |
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| author | Jiajun Cai Jiajun Cai Jiajun Cai Wenjie Huang Wenjie Huang Wenjie Huang Quanzhong Yang |
| author_facet | Jiajun Cai Jiajun Cai Jiajun Cai Wenjie Huang Wenjie Huang Wenjie Huang Quanzhong Yang |
| author_sort | Jiajun Cai |
| collection | DOAJ |
| description | Short-term heavy rainfall often causes large-scale rainstorm debris flows in mountainous areas of Southwest China. Aiming to investigate the accumulation and movement of potential source material for the formation of debris flow hazards under extreme short-term heavy rainfall, this paper takes the Xiangbizui debris flow gully, Southwest China, as a case study. A detailed field engineering and geological investigation was carried out on the valley characteristics, formation conditions, provenance types, distribution range, loose solid material reserves that can be transformed into debris flows, and characteristics showing the variation in the grain size of the accumulated solids along the gully to further explore the characteristics of rainstorm-induced debris flow movement. The dynamic processes of debris flow movement and accumulation are numerically simulated to analyze the maximum velocity, accumulation height, range of influence, and evolutionary process based on the theory of continuous media of the approximate Voellmy solution and a high-precision three-dimensional model. The results indicated that rainstorms and steep terrain are the main factors stimulating debris flows. The amount of loose solid material in the channel is approximately 1550.61 × 104 m3, and the dynamic material reserves are approximately 396.41 × 104 m3. The maximum flow depth and velocity are approximately 3.5 m/s and 13 m/s, respectively, which mainly occur in the upper and middle reaches of the channel and in the accumulation fan at the outlet of the channel. The evolutionary process of the debris flow includes four stages: a 0–1,500 m initial acceleration stage, a 1,500–2,200 m fast forward movement stage, a 2,200–3,400 m acceleration stage in the middle and lower reaches, and a 3,400–4,300 m deceleration and end of accumulation stage. The research findings can provide a scientific basis and strong support for risk assessment and avoidance, as well as prevention and control of debris flows in mountainous areas with severe climate change. |
| first_indexed | 2024-03-08T19:17:53Z |
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| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-08T19:17:53Z |
| publishDate | 2023-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-bebce069a5cd4580902b94aa74de7dca2023-12-27T04:12:03ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-12-011110.3389/feart.2023.12574401257440Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui GullyJiajun Cai0Jiajun Cai1Jiajun Cai2Wenjie Huang3Wenjie Huang4Wenjie Huang5Quanzhong Yang6Research Center of Applied Geology of China Geological Survey, Chengdu, ChinaInstitute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu, ChinaTechnical Center for Geological Hazard Prevention and Control, Chinese Academy of Geological Sciences, Chengdu, ChinaInstitute of Exploration Technology, Chinese Academy of Geological Sciences, Chengdu, ChinaTechnical Center for Geological Hazard Prevention and Control, Chinese Academy of Geological Sciences, Chengdu, ChinaChengdu Huajian Geological Engineering Technology Co Ltd., Chengdu, ChinaSichuan Province Geological Engineering Co Ltd., Chengdu, ChinaShort-term heavy rainfall often causes large-scale rainstorm debris flows in mountainous areas of Southwest China. Aiming to investigate the accumulation and movement of potential source material for the formation of debris flow hazards under extreme short-term heavy rainfall, this paper takes the Xiangbizui debris flow gully, Southwest China, as a case study. A detailed field engineering and geological investigation was carried out on the valley characteristics, formation conditions, provenance types, distribution range, loose solid material reserves that can be transformed into debris flows, and characteristics showing the variation in the grain size of the accumulated solids along the gully to further explore the characteristics of rainstorm-induced debris flow movement. The dynamic processes of debris flow movement and accumulation are numerically simulated to analyze the maximum velocity, accumulation height, range of influence, and evolutionary process based on the theory of continuous media of the approximate Voellmy solution and a high-precision three-dimensional model. The results indicated that rainstorms and steep terrain are the main factors stimulating debris flows. The amount of loose solid material in the channel is approximately 1550.61 × 104 m3, and the dynamic material reserves are approximately 396.41 × 104 m3. The maximum flow depth and velocity are approximately 3.5 m/s and 13 m/s, respectively, which mainly occur in the upper and middle reaches of the channel and in the accumulation fan at the outlet of the channel. The evolutionary process of the debris flow includes four stages: a 0–1,500 m initial acceleration stage, a 1,500–2,200 m fast forward movement stage, a 2,200–3,400 m acceleration stage in the middle and lower reaches, and a 3,400–4,300 m deceleration and end of accumulation stage. The research findings can provide a scientific basis and strong support for risk assessment and avoidance, as well as prevention and control of debris flows in mountainous areas with severe climate change.https://www.frontiersin.org/articles/10.3389/feart.2023.1257440/fullrainstorm debris flownumerical analysisprocess of accumulation movementnumerical simulationfield investigation |
| spellingShingle | Jiajun Cai Jiajun Cai Jiajun Cai Wenjie Huang Wenjie Huang Wenjie Huang Quanzhong Yang Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully Frontiers in Earth Science rainstorm debris flow numerical analysis process of accumulation movement numerical simulation field investigation |
| title | Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully |
| title_full | Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully |
| title_fullStr | Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully |
| title_full_unstemmed | Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully |
| title_short | Detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements: a case study of Xiangbizui Gully |
| title_sort | detailed investigation and analysis of the dynamic evolutionary process of rainstorm debris flows in mountain settlements a case study of xiangbizui gully |
| topic | rainstorm debris flow numerical analysis process of accumulation movement numerical simulation field investigation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1257440/full |
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