Numerical simulation of debris flows with the 2D - SPH depth integrated model
Numerical simulation of debris flows with the 2D - SPH depth integrated model
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DOI：
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发表时间：
2009-04
影响因子：
5.4
通讯作者：
T. Blanc;M. Pastor
中科院分区：
文献类型：
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作者：
T. Blanc;M. Pastor
泥石流分析对于评估风险和划定需要采取减灾措施的脆弱地区十分重要。数值模型是泥石流分析最准确、最有效的工具。SPH深度综合模型是目前可用的模型之一。它是由Pastor于2005年创建的。SPH深度综合模型是能够预测泥石流跳动距离、流速、沉积形态和最终体积的二维模型。它建立在数学模型、流变模型和数值模型的基础上。数学模型的基础是一个耦合深度综合模型，该模型来自于Biot-Zienkiewicz方程的速度-压力版本。流变模型符合本构方程。在这项工作中，摩擦模型和沃尔米模型被用来模拟泥石流。所采用的数值模型是SPH（光滑粒子流体力学）方法。利用解析和反分析对SPH深度综合模型进行了验证。实际上，没有输入参数的有价值的数据库可用。本研究通过三个实例验证了SPH深度综合模型在泥石流风险分析中的有效性。为了改进模型，提出了对侵蚀规律的研究。在本文之后，该模型让用户有机会在Hungr和Egashira侵蚀律之间进行选择，以模拟侵蚀过程。研究表明，Egashira侵蚀规律能更有效地预测泥石流的某些特征，如流速和沉积形态。
Debris flow analysis is important to assess the risk and to delimitate vulnerable areas where mitigation measures are required. Numerical model is the most accurate and efficient tool for debris flow analysis. The SPH depth integrated model is one of the available models. It has been created by Pastor in 2005. The SPH depth integrated model is a 2D model able to predict runout distance, flow velocity, deposition pattern and final volume of debris flows. It is based on a mathematical model, on rheological models and on a numerical model. The basis of the mathematical model is a coupled depth integrated model coming from a velocity-pressure version of Biot-Zienkiewicz equations. The rheological models correspond to constitutive equations. In this work, the frictional and the Voellmy model has been used to simulate debris flows. The numerical model used is the SPH (Smooth Particles Hydrodynamics) methods. The SPH depth integrated model has been validated using analytical and back analysis. Actually not valuable database for input parameters are available. In this study, three case studies have demonstrated that the SPH depth integrated model is useful for debris flow risk analysis. A work on erosion law has been proposed in order to improve the model. After this thesis, the model gives to the user the opportunity to choose between the Hungr and the Egashira erosion law to model erosion processes. The study has shown that the Egashira erosion law is more efficient to predict some characteristics of debris flows, as flow velocity and deposition pattern.