| 四川省冕宁县华岩子沟火后泥石流成灾机理 |
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| 引用本文： | 张绍科,胡卸文,王严,金涛,杨瀛.四川省冕宁县华岩子沟火后泥石流成灾机理[J].中国地质灾害与防治学报,2021,32(5):79-85. |
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| 作者姓名： | 张绍科 胡卸文 王严 金涛 杨瀛 |
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| 作者单位： | 西南交通大学地球科学与环境工程学院，四川 成都 610031 |
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| 基金项目： | 国家自然科学基金项目（41731285;41672283） |
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| 摘 要： | 以四川省冕宁县腊窝乡华岩子沟2019年7月发生的火后泥石流为典型案例，通过对火烧迹地现场地质勘察、降雨模拟试验研究了与火后泥石流形成相关的地形地貌、火行为分布、松散物源规模、产流产沙特征以及相应的灰烬层、斥水性、渗透性等相关试验。结果表明:（1）火烧迹地的斥水性强度越强，径流产流量越大；（2）严重火烧区的产沙量明显高于中度和轻度火烧区；（3）火烧迹地的斥水性与火烈度大致呈正相关，而渗透性恰好与之相反。研究揭示了火后泥石流的演变过程，为火后泥石流的防治和预警提供了理论依据。
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| 关 键 词： | 火后泥石流 火烧迹地 火烈度 降雨模拟 产流产沙 |
| 收稿时间： | 2021-01-13 |
Disaster mechanism of post-fire debris flow in Huayanzi gully,Mianning County,Sichuan Province |
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| Affiliation: | Faculty of Geosciences and Environment Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China |
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| Abstract: | This paper studied the characteristics of geomorphology, fire behavior, unconsolidated source material volume, runoff and sediment production related to post-fire debris flow formations, field investigation in the burned area and rainfall simulation experiment were adopted to study the post-fire debris flow in Huayanzi gully, Mianning County, Sichuan Province occurred on 4 July 2019. The associated ash layer, water repellency and permeability experiments were also conducted. The results suggest that (1) the runoff charge shows a positive correlation with water repellency in burned area. (2) the sediment yields in severely burned area are conspicuously larger than that in moderate and slight burned areas. (3) the water repellency in burned area is approximately positively correlated with fire severity, while the permeability presents the negative correlation. This study revealed the evolution process of post-fire debris flow, and provided theoretical basis for the prevention and early warning of post-fire debris flows. |
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