Blocking effect of debris flow in the segment of bayonet terrain: A case study at the Huatoujian gulley of Shefang, Sichuan

HUANG Jie; DANG Chao

doi:10.16031/j.cnki.issn.1003-8035.202207011

2023 Vol. 34, No. 3

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Article navigation > The Chinese Journal of Geological Hazard and Control > 2023 > 34(3): 48-57

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HUANG Jie, DANG Chao. Blocking effect of debris flow in the segment of bayonet terrain: A case study at the Huatoujian gulley of Shefang, Sichuan[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(3): 48-57. doi: 10.16031/j.cnki.issn.1003-8035.202207011

Citation:

HUANG Jie, DANG Chao. Blocking effect of debris flow in the segment of bayonet terrain: A case study at the Huatoujian gulley of Shefang, Sichuan[J]. The Chinese Journal of Geological Hazard and Control, 2023, 34(3): 48-57. doi: 10.16031/j.cnki.issn.1003-8035.202207011

Blocking effect of debris flow in the segment of bayonet terrain: A case study at the Huatoujian gulley of Shefang, Sichuan

HUANG Jie^1,,
DANG Chao^1,2, ,

1.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang, Hubei　443002, China
2.
College of Civil Engineering & Architecture, Three Gorges University, Yichang, Hubei　443002, China

More Information

Corresponding author: DANG Chao, dangchao1982@126.com

Received Date: 10 July 2022

Revised Date: 09 November 2022

Accepted Date: 10 November 2022

Publish Date: 25 June 2023

Abstract

Abstract

The temporary block-breach phenomena tend to occurrence when debris flows run throng bayonet segment, accompanying with instant scale-amplified effect. By the way of field investigations as well as indoor flume tests, the influence factors and formation mechanisms of the block-breach effect were studied herein. Results showed that the flow amplification caused by the blocking effect of debris flow or the flow attenuation caused by the accumulation of solid materials in the bayonet segments, were related to the geometric conditions of the bayonet, the debris flow fluid and trench features, and whether there was additional loose material . The existence of bayonet was mostly a positive factor for the flow attenuation of debris flow, and whether there was the addition of loose materials was the key factor for the blocking effect of debris flow in bayonet segments. This study provided theoretical significance and application prospects for understanding the motional and deposited regularities of debris flow in where micro-topography abruptly changed, and improving the technical regulations of natural hazard prevention and mitigation.
- debris flow /
- bayonet /
- flume test /
- blocking effect /
- geo-hazard prevention and mitigation

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References

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