Debris flow formation process and critical hydrodynamic conditions in the meizoseismal area of the Wenchuan earthquake
Debris flow formation process and critical hydrodynamic conditions in the meizoseismal area of the Wenchuan earthquake
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汶川地震强震区泥石流形成过程及临界水动力条件
DOI：
10.1007/s11629-014-3370-0
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发表时间：
2015-06
影响因子：
2.5
通讯作者：
Ou Guo-qiang
中科院分区：
文献类型：
--
作者：
Wang Jun;Yu Yan;Pan Hua-li;Qiao Cheng;Ou Guo-qiang
汶川地震产生强烈的地表扰动，引发大量松散沉积物，形成了具有特殊流域水文特征的灾害多发环境。本文旨在提出泥石流形成过程，并探讨地震引发的松散沉积物的渗透特性和临界水动力条件。选择位于汶川地震强震区的都江堰市郭娟岩沟（北纬31°05′27″～31°05′46″，东经103°36′58″～103°37′09″E）为研究区，对其易灾环境进行分析。首先通过稳定性分析提出了泥石流的形成过程，然后通过原位渗透性实验确定了松散沉积物的渗透特征。最后，通过分布式水文模型模拟了临界1小时降雨量，并通过现场观测进行了验证。根据水动力与松散沉积物阻力之间的关系，泥石流的形成过程可分为三个阶段。三种前期湿度条件（I-干、II-正常和Ill-湿）下的1 h临界降雨量分别为52 mm/h、43 mm/h和34 mm/h。本研究基于稳定性分析提出了汶川地震强震区泥石流的形成过程，并确定了局地泥石流预警的降雨阈值，对于泥石流减缓和风险管理具有重要意义。
The Wenchuan earthquake generated strong surface disturbances and triggered a large number of loose deposits, resulting in the disaster-prone environment with special watershed hydrological characteristics. This paper was to propose a debris flow formation process and explore the permeability characteristics and critical hydrodynamic conditions of the loose deposits triggered by the earthquake. The Guo Juanyan gully (31°05′27″ N to 31°05′46″ N, 103°36′58″ E to 103°37′09″ E) in Du Jiangyan City, located in the meizoseismal areas of the Wenchuan earthquake, was chosen as the study area and the disaster-prone environment was analyzed. The formation process of the debris flow was first proposed using a stability analysis, and then, the permeability characteristics of loose deposits were determined viain situpermeability experiments. Finally, the critical 1 h rainfall was simulated through a distributed hydrological model and verified by field observations. The formation process of debris flow could be divided into three stages based on the relationship between the hydrodynamic force and loose deposit resistance. The critical 1 h rainfall amounts under three antecedent moisture conditions (I-dry, II-normal and Ill-wet) were 52 mm/h, 43 mm/h and 34 mm/h, respectively. This study proposed a debris flow formation process in the meizoseismal areas of the Wenchuan earthquake based on the stability analysis and defined the rainfall threshold for debris flow early warning at the local level, which is significant for debris flow mitigation and risk management.
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影响因子：
2.2
作者：
Chuan Tang;Jing Zhu;Chang Ming;Jun Ding;Xin Qi
通讯作者：
Chuan Tang;Jing Zhu;Chang Ming;Jun Ding;Xin Qi
DOI：
10.1007/s10064-009-0201-6
发表时间：
2009-05-01
影响因子：
4.2
作者：
Tang, C.;Zhu, J.;Liang, J. T.
通讯作者：
Liang, J. T.
DOI：
--
发表时间：
2012
期刊：
Water Resources and Power
影响因子：
--
作者：
Sun Yuansen
通讯作者：
Sun Yuansen
影响因子：
4.6
作者：
Qiang Xu;Shuai Zhang;Wei-le Li;T. V. Asch
通讯作者：
Qiang Xu;Shuai Zhang;Wei-le Li;T. V. Asch
影响因子：
3.1
作者：
Zhiqing Xu;S. Ji;Haibing Li;L. Hou
通讯作者：
Zhiqing Xu;S. Ji;Haibing Li;L. Hou