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Volume 56 Issue 4
Jul.  2021
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Article Contents
Journal of Southwest Jiaotong University  > 2021  >  56(4): 818-827.
YANG Ying, HU Xiewen, WANG Yan, JIN Tao, CAO Xichao, HAN Mei. Spatial Development Characteristics of Post-Fire Debris Flow in Bajiaolou Town[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 818-827. doi: 10.3969/j.issn.0258-2724.20200015
Citation: YANG Ying, HU Xiewen, WANG Yan, JIN Tao, CAO Xichao, HAN Mei. Spatial Development Characteristics of Post-Fire Debris Flow in Bajiaolou Town[J]. Journal of Southwest Jiaotong University, 2021, 56(4): 818-827. doi: 10.3969/j.issn.0258-2724.20200015
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Spatial Development Characteristics of Post-Fire Debris Flow in Bajiaolou Town

doi: 10.3969/j.issn.0258-2724.20200015
  • Received Date: 04 Feb 2020
  • Rev Recd Date: 04 Jul 2020
    • Available Online: 09 Jul 2020
  • Publish Date: 15 Aug 2021
    Abstract
  • As a special type of debris flows closely relevant to forest fire, the generation of post-fire debris flow often shows a spatial variation. It is of great significance to analyze the spatial development characteristics and its influencing factors for hazard mitigation and reduction. By means of field investigation, in-situ and laboratory tests, and remote sensing interpretation, multi-factor analysis was conducted on the 15 channels in the burned area in Bajiaolou town of Yajiang county in terms of their spatial development characteristics, topography, forest fire, vegetation and rainfall conditions. The results show that the higher the fire intensity, the stronger the soil water repellency and the lower the permeability; moreover, the physical and mechanical properties of soil deteriorate more seriously, which contribute to the generation of post-fire debris flow. The occurrence frequency of post-fire debris flow rises when the burned area become larger and the vegetation cover coefficient lower. In contrast to the large basins, the smaller basins show more vulnerability to post-fire debris flow for their short channel lengths and high longitudinal slopes. Besides, the recurrence time of the triggering rainfall intensity that corresponds to four of five debris-flow events in the study areas is less than 5 years, and the triggering rainfall intensity also increases with time.

     

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