The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor
In recent years, debris flow disasters have occurred frequently along the highway, causing river blockages and road interruptions, which seriously threaten the safety of people's lives and property. Highway G318 is an important throat project linking Sichuan and Tibet; at the same time, it is a...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-05-01
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| Series: | Frontiers in Ecology and Evolution |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fevo.2023.1166239/full |
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| author | Na He Na He Yabing Song Yabing Song Guisheng Hu Zhiquan Yang Zhiquan Yang Zhiquan Yang Qixuan Fu Filip Gurkalo |
| author_facet | Na He Na He Yabing Song Yabing Song Guisheng Hu Zhiquan Yang Zhiquan Yang Zhiquan Yang Qixuan Fu Filip Gurkalo |
| author_sort | Na He |
| collection | DOAJ |
| description | In recent years, debris flow disasters have occurred frequently along the highway, causing river blockages and road interruptions, which seriously threaten the safety of people's lives and property. Highway G318 is an important throat project linking Sichuan and Tibet; at the same time, it is an important channel for the economic development of Sichuan and Tibet and the transportation of national defense materials. Taking the Linzhi–Lhasa Section of Highway G318 as an example, this study analyses the distribution law and characteristics of coupling factors of debris flows in the study area (under its topographical, hydrometeorological, geological, and structural conditions) using remote sensing interpretation, field surveys, and mathematical statistics. The research shows that: (1) The types and quantity of debris flows in the region show statistical laws under the factors of the slope, slope aspect, drainage area, and gradient of the gully. The vegetation coverage in the upper reaches of the Nyang River valley gradually decreases, and the average debris flow disaster density is 0.529/km, which is the most densely distributed area of debris flow. (2) The distribution density of regional debris flows in narrow valleys is greater than that in wide valleys, and those in the Nyang River basin are greater than those in the Lhasa River basin. (3) By comparing the tectonic geological map and the debris flow distribution map, it was found that the debris flow distribution is controlled by faults, and 71% of the debris flow basins have faults. (4) There is a significant positive correlation between the gradient of the material source area and the gradient of the debris flow gully, as well as a close positive correlation between the rainfall and the fault density, and a close negative correlation between the average gradient and the drainage area. Due to the unique topography and geomorphology of different regions, a difference in meteorology and hydrology occurred. This further affected the topography, geomorphology, and distribution of debris flow disasters. Based on the study of the distribution law of regional debris flow and geological environmental factors, this study provides strong support for regional debris flow prevention and related research. |
| first_indexed | 2024-04-09T12:36:39Z |
| format | Article |
| id | doaj.art-98bd0538f403444a8a293b14192b29a7 |
| institution | Directory Open Access Journal |
| issn | 2296-701X |
| language | English |
| last_indexed | 2024-04-09T12:36:39Z |
| publishDate | 2023-05-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Ecology and Evolution |
| spelling | doaj.art-98bd0538f403444a8a293b14192b29a72023-05-15T12:12:05ZengFrontiers Media S.A.Frontiers in Ecology and Evolution2296-701X2023-05-011110.3389/fevo.2023.11662391166239The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridorNa He0Na He1Yabing Song2Yabing Song3Guisheng Hu4Zhiquan Yang5Zhiquan Yang6Zhiquan Yang7Qixuan Fu8Filip Gurkalo9Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, ChinaChina Jikan Research Institute of Engineering Investigation and Design, Co., Ltd., Xi'an, ChinaInstitute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, ChinaFaculty of Public Safety and Emergency Management, Kunming University of Science and Technology, Kunming, Yunnan, ChinaKey Laboratory of Geological Disaster Risk Prevention and Control and Emergency Disaster Reduction of Ministry of Emergency Management of the People's Republic of China, Kunming University of Science and Technology, Kunming, Yunnan, ChinaKey Laboratory of Early Rapid Identification, Prevention and Control of Geological Disasters in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province, Kunming University of Science and Technology, Kunming, Yunnan, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, ChinaIn recent years, debris flow disasters have occurred frequently along the highway, causing river blockages and road interruptions, which seriously threaten the safety of people's lives and property. Highway G318 is an important throat project linking Sichuan and Tibet; at the same time, it is an important channel for the economic development of Sichuan and Tibet and the transportation of national defense materials. Taking the Linzhi–Lhasa Section of Highway G318 as an example, this study analyses the distribution law and characteristics of coupling factors of debris flows in the study area (under its topographical, hydrometeorological, geological, and structural conditions) using remote sensing interpretation, field surveys, and mathematical statistics. The research shows that: (1) The types and quantity of debris flows in the region show statistical laws under the factors of the slope, slope aspect, drainage area, and gradient of the gully. The vegetation coverage in the upper reaches of the Nyang River valley gradually decreases, and the average debris flow disaster density is 0.529/km, which is the most densely distributed area of debris flow. (2) The distribution density of regional debris flows in narrow valleys is greater than that in wide valleys, and those in the Nyang River basin are greater than those in the Lhasa River basin. (3) By comparing the tectonic geological map and the debris flow distribution map, it was found that the debris flow distribution is controlled by faults, and 71% of the debris flow basins have faults. (4) There is a significant positive correlation between the gradient of the material source area and the gradient of the debris flow gully, as well as a close positive correlation between the rainfall and the fault density, and a close negative correlation between the average gradient and the drainage area. Due to the unique topography and geomorphology of different regions, a difference in meteorology and hydrology occurred. This further affected the topography, geomorphology, and distribution of debris flow disasters. Based on the study of the distribution law of regional debris flow and geological environmental factors, this study provides strong support for regional debris flow prevention and related research.https://www.frontiersin.org/articles/10.3389/fevo.2023.1166239/fulldebris flowdistribution lawcoupling factorsdebris flow densityfault density |
| spellingShingle | Na He Na He Yabing Song Yabing Song Guisheng Hu Zhiquan Yang Zhiquan Yang Zhiquan Yang Qixuan Fu Filip Gurkalo The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor Frontiers in Ecology and Evolution debris flow distribution law coupling factors debris flow density fault density |
| title | The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor |
| title_full | The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor |
| title_fullStr | The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor |
| title_full_unstemmed | The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor |
| title_short | The distribution law and coupling factors of debris flows in the G318 Linzhi–Lhasa section of the Sichuan–Tibet traffic corridor |
| title_sort | distribution law and coupling factors of debris flows in the g318 linzhi lhasa section of the sichuan tibet traffic corridor |
| topic | debris flow distribution law coupling factors debris flow density fault density |
| url | https://www.frontiersin.org/articles/10.3389/fevo.2023.1166239/full |
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