Characteristics and activity analysis of the catastrophic “6•26” debris flow in the Banzi catchment, Wenchuan County of Sichuan Province

ZHANG Xianzheng; TIE Yongbo; NING Zhijie; YANG Chang; LI Zongliang; LI Minghui; LIANG Jingtao; LU Jiayan; LU Tuo; LI Guanghui; LI Guo; XIANG Binglin

doi:10.16030/j.cnki.issn.1000-3665.202307003

2023 Vol. 50, No. 5

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Article navigation > Hydrogeology & Engineering Geology > 2023 > 50(5): 134-145

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ZHANG Xianzheng, TIE Yongbo, NING Zhijie, YANG Chang, LI Zongliang, LI Minghui, LIANG Jingtao, LU Jiayan, LU Tuo, LI Guanghui, LI Guo, XIANG Binglin. Characteristics and activity analysis of the catastrophic “6•26” debris flow in the Banzi catchment, Wenchuan County of Sichuan Province[J]. Hydrogeology & Engineering Geology, 2023, 50(5): 134-145. doi: 10.16030/j.cnki.issn.1000-3665.202307003

Citation:

ZHANG Xianzheng, TIE Yongbo, NING Zhijie, YANG Chang, LI Zongliang, LI Minghui, LIANG Jingtao, LU Jiayan, LU Tuo, LI Guanghui, LI Guo, XIANG Binglin. Characteristics and activity analysis of the catastrophic “6•26” debris flow in the Banzi catchment, Wenchuan County of Sichuan Province[J]. Hydrogeology & Engineering Geology, 2023, 50(5): 134-145. doi: 10.16030/j.cnki.issn.1000-3665.202307003

Characteristics and activity analysis of the catastrophic “6•26” debris flow in the Banzi catchment, Wenchuan County of Sichuan Province

1.
Chengdu Center of China Geological Survey （Geosciences Innovation Center of Southwest China）, Chengdu, Sichuan　610081, China
2.
Technology Innovation Center for Risk Prevention and Mitigation of Geohazard, Ministry of Natural Resources, Chengdu, Sichuan　611734, China
3.
Observation and Research Station of Chengdu Geological Hazards, Ministry of Natural Resources, Chengdu, Sichuan　610000, China
4.
Chinese Academy of Geological Sciences, Beijing　100037, China
5.
Sichuan Geological Survey, Chengdu, Sichuan　610084, China

More Information

Corresponding author: TIE Yongbo, tyongbo@mail.cgs.gov.cn

Received Date: 02 July 2023

Revised Date: 08 July 2023

Publish Date: 15 September 2023

Abstract

Abstract

On 26 June 2023, a catastrophic debris flow occurred in the Banzi Catchment in Wenchuan county of Sichuan province. This debris flow event is a viscous debris flow triggered by short duration heavy rainfall. The volume of debris which transported out of the catchment by debris flow is more than 8.3×10⁵ m³, and the debris flow blocked the Minjiang River. The river blockage formed a barrier lake with an area of about 0.4 km². To reveal the formation mechanism of the occurrence of the extremely large debris flow events 15 years after the Wenchuan earthquake, This paper adopts a comprehensive method of field investigation, image interpretation, topographic superposition and calculation of forced vortex. This paper also analyzes the formation mechanism of debris flow and the characteristics of river blocking. Based on the results, this paper gives some suggestions of investigation and prevention of debris flow in the Banzi catchment. The research results show that (1) the triggering rainfall is characterized by short duration and high intensity. The main initiation positions are in the channel. The main debris supply is from the debris deposition along the channel. (2) The peak discharge of debris flow is as high as 755.5 m³/s, which is the main cause of river blockage. (3) Since the Wenchuan earthquake, the debris flow activity of the Banzi Catchment has the characteristics of lag and long-term because of the coupled transport of debris on the slope and along the channel. (4) The volume of the debris source which can be eroded along the channel should be paid more attention in subsequent investigation and prevention. The research results are helpful in better understanding of the activity evolution of the post-seismic debris flow. They can also provide scientific references for the prevention of the post-seismic debris flow..
- Wenchuan county /
- Banzi Catchment /
- post-seismic; debris flow /
- Minjiang River /
- river blocking

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References

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