| China Geological Environment Monitoring Institute, China Geological Disaster Prevention Engineering Industry Association | Host |
| Citation: |
WANG Yuanhuan, SHEN Haowen, XIE Wanyin, LU Ke, HU Guisheng. Analysis of the rainfall threshold for post-fire debris flow initiation: A case study of the debris flow at Ren’eyong gully in Xiangcheng County, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control, 2024, 35(1): 108-115. doi: 10.16031/j.cnki.issn.1003-8035.202208007
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Analysis of the rainfall threshold for post-fire debris flow initiation: A case study of the debris flow at Ren’eyong gully in Xiangcheng County, Sichuan Province
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Abstract
In the early summer of 2014, a wildfire ravaged the Ren’eyong valley in the central Mt. Hengduan region of southwestern China. Following the blaze, debris flows were triggered three times in branch No. 3 due to short-term, low intensity rainfall. A year later, in August 2015, a brief period of high-intensity rainfall generated debris flows not only in branch No.3, but also in branch No. 1 and No. 2, as well as several smaller basins in the vicinity. To investigate the rainfall response characteristics of post-wildfire debris flow, the distance correction method was used to process the rainfall data. By analyzing the rainfall patterns of four debris flow events, the reseachers were able to identify the effects of watershed characteristics on the initiation of debris flow and its influence on different rainfall thresholds in each branch. The study found that: 1） Post fire debris flows can occur at a low rainfall threshold, which tends to increase over time. 2） The Ren’eyong valley experience high-frequency post fire debris flows, which can be attributed not only to the amplification of slope runoff and erosion caused by rainfall after the destruction of natural vegetation due to the wildfire, but also to the geological and geomorphic conditions of the area. 3） The rainfall threshold in each branch is primarily dependent on the drainage area, as the magnitude of discharge controls the entrainment.
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References
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WANG Yuanhuan, SHEN Haowen, XIE Wanyin, LU Ke, HU Guisheng. Analysis of the rainfall threshold for post-fire debris flow initiation: A case study of the debris flow at Ren’eyong gully in Xiangcheng County, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control, 2024, 35(1): 108-115. doi: 10.16031/j.cnki.issn.1003-8035.202208007
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Figure 1.
Location of the Ren’eyong valley and related information of the study area
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Figure 2.
Outline map of regional geology
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Figure 3.
Site view of the on-site trenching
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Figure 4.
Site photo of the ruined houses destroyed by debris flows
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Figure 5.
Rainfall process during the debris flows
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Figure 6.
Site photo of the upstream channel at 3# branch ditch
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Figure 7.
Site photo of the downstream channel at 3# branch ditch
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Figure 8.
Overview of the debris flow at 1# branch ditch
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Figure 9.
Overview of the debris flow at 2# branch ditch
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Figure 10.
Comparison of slope sediments in non-fire area and fire areas
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Figure 11.
Site photo of the burned vegetation carried by post-fire debris flow
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Figure 12.
Overview of debris flow erosion in the branch gully