一种流动性滑坡涌浪动力学模型

郭剑; 沈伟; 李同录; 沈月强; 雷雨露

doi:10.14042/j.cnki.32.1309.2019.02.012

一种流动性滑坡涌浪动力学模型

1.
长安大学地质工程与测绘学院, 陕西西安 710054;
2.
University of Bologna, Department of Biological, Geological and Environmental Science, Bologna 40121

基金项目: 国家重点研发计划资助项目（2017YFC1501302）；国家留学基金管理委员会资助项目（201806560011）

详细信息

作者简介:
郭剑(1993-),男,陕西渭南人,博士研究生,主要从事滑坡、泥石流地质灾害运动机理及数值模拟研究。E-mail:chdguojian@163.com

通讯作者:
李同录,E-mail:dcdgx08@chd.edu.cn

中图分类号: P694
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出版历程
- 收稿日期: 2018-07-19
- 刊出日期: 2019-04-24

Establishment of dynamic model of a flow-like landslide-induced surge

1.
Chang'an University, Department of Geological Engineering, Xi'an 710054, China;
2.
University of Bologna, Department of Biological, Geological and Environmental Science, Bologna 40121, Italy

Funds: The study is financially supported by the National Key R&D Program of China (No.2017YFC1501302) and the China Scholarship Council & University of bologna Joint Scholarship (No.201806560011).

摘要

摘要: 滑坡涌浪是入水滑坡引起的一种次生灾害，其致灾范围远大于滑坡的运动区域，准确预测其演化过程是防治这类灾害的关键。现有预测模型多将滑体简化为刚体，而实际滑坡多表现出流态运动的特征。为更合理地描述滑体和涌浪的耦合运动，将滑体视为流态物质，在此基础上推导了滑坡与水体耦合运动的控制方程，利用有限差分法对控制方程求解，建立了一种可模拟流动性滑坡涌浪演化过程的动力学模型。使用该模型对三峡库区的龚家方滑坡涌浪的演化过程进行模拟，将模拟所得河道纵截面处的最大浪高值与实测值进行对比，结果表明最大浪高值出现在滑坡的主滑动方向，且最大浪高沿纵截面两侧快速衰减，模拟结果与实测吻合。
- 滑坡涌浪 /
- 流动性滑坡 /
- 数值模拟 /
- 有限差分法
Abstract: Landslide-induced surge is a kind of secondary disasters triggered by waterside landslides. Generally,the endangering range in a landslide-induced surge far exceeds the motion area of the landslide,and accurately predicting spatial evolution of landslide-induced surge is of significant importance for disaster prevention. However,the existing models usually simplify landslides as rigid bodies,which is obviously against the fact that many landslides propagate in a flow-like way. Therefore,a numerical model was put forward in this paper to provide more reliable prediction results for landslide-induced surges. By treating slip masses as flow-like materials,the governing equations of landslide-water coupling motion were derived. Next,the governing equations were solved by the finite difference method,and the dynamic model that can simulate the evolutionary process of flow-like landslide-induced surge was established. Finally,the evolutionary process of Gongjiafang landslide located at the Three Gorges of the Yangtze River was simulated by the model and the simulated maximum wave heights in the longitudinal section (i.e.,the flow direction) of the river were compared with the measured data. Results show that the maximum wave height in this section appears in the main sliding direction of the landslide,and the maximum wave heights on both two sides decrease quickly. The simulated results agree well with the measured values. The established model can provide more adequate prediction of the influence range of landslide-induced surge.
- landslide-induced surge /
- flow-like landslides /
- numerical simulation /
- finite difference method

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