水土保持学报2025，Vol.39Issue(3)：345-351,7.DOI:10.13870/j.cnki.stbcxb.2025.03.022
火后泥石流烧猪皮效应
Study of the"Roasted Pigskin-Effect"of Post-Fire Debris Flow
摘要
Abstract
[Objective]Post-fire debris flow is a specific type of debris flow with universal common characteristics,originating from large forest fires.It is found that there is a"roasted pigskin effect"in post-fire debris flows,which is primarily attributed to the fire-calcined effect of wildfires on the underlying surface vegetation and rock-soil media.[Methods]Numerical simulation was used to analyze the fire-calcination effect on the underlying surface and reveal the temperature conduction process and changes of temperature stress on the underlying surface following the wildfire disaster.[Results]The depth of influence of wildfire on the underlying surface could reach 3 m,and the temperature stress could reach 405 MPa,which could easily cause thermal cracking and decomposition of the underlying rock and soil.The concept of the post-fire material sources was proposed,and a structure model of the post-fire material sources was established,which included two parts,namely,the volcanic ash layer and the fire-calcined layer,with the former being the primary source of the initial stage of post-fire debris flow,and the latter being the primary source of the mid-and late-stage of the post-fire debris flow.Based on the post-fire material sources,the mechanism of post-fire debris flow formation was explored,i.e.,the stage of surface-washing evolution for ash material sources and the stage of gully erosion evolution for the fire-calcined layer,the former appeared in about two years after the wildfire,while the latter spanned a much longer time scale,potentially reaching millennium to ten thousand years.From the perspective of"roasted pigskin effect"of post-fire debris flow,strategies for prevention and control of post-fire debris flow were explored.[Conclusion]The research results have positive significance for studying the formation mechanism and targeted management of post-fire debris flow.关键词
火后泥石流/烧猪皮效应/下垫面火煅作用/火后物源/火后泥石流发育机理Key words
post-fire debris flow/the roasted pigskin effect/fire-calcination effect on the underlying surface/post-fire material sources/development mechanism of the post-fire debris flow分类
地质学引用本文复制引用
陈洪凯,张斌,王圣娟,王立龙..火后泥石流烧猪皮效应[J].水土保持学报,2025,39(3):345-351,7.基金项目
国家重点研发计划项目(2018YFC1505403) （2018YFC1505403）
