| 四川省九龙县色脚沟火后泥石流成灾机理 |
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| 引用本文： | 任云,胡卸文,王严,杨瀛.四川省九龙县色脚沟火后泥石流成灾机理[J].水文地质工程地质,2018,0(6):150-150. |
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| 作者姓名： | 任云 胡卸文 王严 杨瀛 |
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| 作者单位： | 1. 西南交通大学地球科学与环境工程学院，四川 成都610031；2 西南交通大学，高速铁路运营安全空间信息技术国家地方联合工程实验室，四川 成都610031 |
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| 基金项目： | 国家自然科学基金项目资助（41731285；41672283）；四川省国土资源厅科学研究计划资助(KJ-2014-10；KJ-2015-18；KJ-2016-8) |
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| 摘 要： | 火后泥石流是一种与林火密切相关的泥石流，以四川省九龙县三岩龙乡色脚沟火后泥石流为典型实例，采用现场调查、遥感解译、室内外实验等方法，系统开展了火后泥石流发育特点及形成机理研究。结果表明，灰烬层特别是表层岩土体经过林火烘烤后物理、水理、力学性质发生改变，构成了不同于常规泥石流的物源组成，火烧迹地土体渗透系数平均为4.31×10-5 m/s，而未火烧区土体渗透系数平均为7.52×10-5 m/s，两者渗透性不同，导致坡面径流存在差异而改变沟域内的汇水条件，降低泥石流启动降雨阈值，进而影响火烧迹地泥石流物源的起动机制，表明火后泥石流成灾具有与常规泥石流完全不同特点的发育特征和成灾机理。
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| 关 键 词： | 火后泥石流 渗透系数 灰烬层 色脚沟泥石流 |
| 收稿时间： | 2018-05-18 |
| 修稿时间： | 2018-06-07 |
Disaster mechanism of the Sejiao post-fire debris flow in Jiulong County of Sichuan |
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| REN Yun,HU Xiewen,WANG Yan,YANG Ying.Disaster mechanism of the Sejiao post-fire debris flow in Jiulong County of Sichuan[J].Hydrogeology and Engineering Geology,2018,0(6):150-150. |
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| Authors: | REN Yun HU Xiewen WANG Yan YANG Ying |
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| Institution: | 1.School of Geosciences and Environment Engineering, Southwest Jiaotong University, Chengdu, Sichuan610031, China; 2.State-Province Joint Engineering Laboratory of Spatial Information Technology for High-Speed Railway Safety, Southwest Jiaotong University, Chengdu, Sichuan610031, China |
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| Abstract: | Post-fire debris flow is a kind of debris flow that is closely related to forest fire. The post-fire debris flow in the Sejiao Ravine of the Sanyanlong township in Jiulong county of Sichuan is takan as a typical example, and the developmental characteristics and the formation mechanism of the post-fire debris flow is systematically examined by means of on-site investigation, remote sensing interpretation, indoor and outdoor experiments. The results show that the ash layer, especially the surface soil, of which the physical, hydrological and mechanical properties were changed after being baked by forest fire, constitutes the source which is different from the conventional debris flow. The average coefficient of permeability of the disturbed soil in the burned area is 4.31×10-5 m/s, while the average coefficient of permeability of the soil in the unburned area is 7.52×10-5 m/s. Different permeability lead to the difference between slope-runoff and the change in the catchment conditions in the gully, and reduce the rainfall threshold of the debris flow, so as to affect the trigger mechanism of the debris flow in the burned area. It indicates that the development characteristics and disaster mechanism of the post-fire debris flow are totally different from the conventional debris flow. |
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