The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China
<p>In mountainous areas, damage caused by debris flows is often aggravated by subsequent dam-burst floods within the main river confluence zone. On 30 August 2020, a catastrophic disaster chain occurred at the confluence of the Heixiluo Gully and Niri River in Ganluo County, southwest China, c...
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Copernicus Publications
2024-11-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://nhess.copernicus.org/articles/24/4179/2024/nhess-24-4179-2024.pdf |
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| author | L. Wei K. Hu S. Liu L. Ning L. Ning X. Zhang X. Zhang Q. Zhang Q. Zhang Md. A. Rahim Md. A. Rahim Md. A. Rahim |
| author_facet | L. Wei K. Hu S. Liu L. Ning L. Ning X. Zhang X. Zhang Q. Zhang Q. Zhang Md. A. Rahim Md. A. Rahim Md. A. Rahim |
| author_sort | L. Wei |
| collection | DOAJ |
| description | <p>In mountainous areas, damage caused by debris flows is often aggravated by subsequent dam-burst floods within the main river confluence zone. On 30 August 2020, a catastrophic disaster chain occurred at the confluence of the Heixiluo Gully and Niri River in Ganluo County, southwest China, consisting of a debris flow, the formation of a barrier lake, and subsequent dam break that flooded the community. This study presents a comprehensive analysis of the characteristics of the two hazards and the resulting damage to buildings from the cascading hazards. The peak discharge of the debris flow in the gully mouth reached 1871 <span class="inline-formula">m<sup>3</sup> s<sup>−1</sup></span>. Following the dam break, the flood with a peak discharge of 2737 <span class="inline-formula">m<sup>3</sup> s<sup>−1</sup></span> significantly altered the main river channel, causing a 4-fold increase in flood inundation compared to an ordinary flood. Three hazard zones were established based on the building damage patterns: (I) primary debris flow burial, (II) secondary dam-burst flood inundation, and (III) sequential debris flow burial and dam-burst inundation. Vulnerability curves were developed for Zone (II) and Zone (III) using impact pressures and inundation depths, and a vulnerability assessment chart is presented that contains the three damage categories. This research addresses a gap in the vulnerability assessments of debris flow hazard cascades and can support future disaster mitigation within confluence areas.</p> |
| format | Article |
| id | doaj-art-7c48266c38b64fdbadd366baa182cbaf |
| institution | Kabale University |
| issn | 1561-8633 1684-9981 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj-art-7c48266c38b64fdbadd366baa182cbaf2024-11-28T10:07:24ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812024-11-01244179419710.5194/nhess-24-4179-2024The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest ChinaL. Wei0K. Hu1S. Liu2L. Ning3L. Ning4X. Zhang5X. Zhang6Q. Zhang7Q. Zhang8Md. A. Rahim9Md. A. Rahim10Md. A. Rahim11Key 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, ChinaKey Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaUniversity of Chinese Academy of Sciences, Beijing 100149, ChinaKey Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaUniversity of Chinese Academy of Sciences, Beijing 100149, ChinaKey Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaUniversity of Chinese Academy of Sciences, Beijing 100149, ChinaKey Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, ChinaUniversity of Chinese Academy of Sciences, Beijing 100149, ChinaDepartment of Disaster Resilience and Engineering, Patuakhali Science and Technology University, Dumki, Patuakhali-8602, Bangladesh<p>In mountainous areas, damage caused by debris flows is often aggravated by subsequent dam-burst floods within the main river confluence zone. On 30 August 2020, a catastrophic disaster chain occurred at the confluence of the Heixiluo Gully and Niri River in Ganluo County, southwest China, consisting of a debris flow, the formation of a barrier lake, and subsequent dam break that flooded the community. This study presents a comprehensive analysis of the characteristics of the two hazards and the resulting damage to buildings from the cascading hazards. The peak discharge of the debris flow in the gully mouth reached 1871 <span class="inline-formula">m<sup>3</sup> s<sup>−1</sup></span>. Following the dam break, the flood with a peak discharge of 2737 <span class="inline-formula">m<sup>3</sup> s<sup>−1</sup></span> significantly altered the main river channel, causing a 4-fold increase in flood inundation compared to an ordinary flood. Three hazard zones were established based on the building damage patterns: (I) primary debris flow burial, (II) secondary dam-burst flood inundation, and (III) sequential debris flow burial and dam-burst inundation. Vulnerability curves were developed for Zone (II) and Zone (III) using impact pressures and inundation depths, and a vulnerability assessment chart is presented that contains the three damage categories. This research addresses a gap in the vulnerability assessments of debris flow hazard cascades and can support future disaster mitigation within confluence areas.</p>https://nhess.copernicus.org/articles/24/4179/2024/nhess-24-4179-2024.pdf |
| spellingShingle | L. Wei K. Hu S. Liu L. Ning L. Ning X. Zhang X. Zhang Q. Zhang Q. Zhang Md. A. Rahim Md. A. Rahim Md. A. Rahim The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China Natural Hazards and Earth System Sciences |
| title | The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China |
| title_full | The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China |
| title_fullStr | The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China |
| title_full_unstemmed | The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China |
| title_short | The vulnerability of buildings to a large-scale debris flow and outburst flood hazard cascade that occurred on 30 August 2020 in Ganluo, southwest China |
| title_sort | vulnerability of buildings to a large scale debris flow and outburst flood hazard cascade that occurred on 30 august 2020 in ganluo southwest china |
| url | https://nhess.copernicus.org/articles/24/4179/2024/nhess-24-4179-2024.pdf |
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