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arXiv 2008.08449physics.flu-dyncs.NAmath.NAphysics.comp-ph
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推移质输移问题的浅水矩模型

Shallow Water Moment models for bedload transport problems

José Garres-Díaz, Manuel J. Castro Díaz, Julian Koellermeier, Tomás Morales de Luna

摘要:

本文提出了一个简单而精确的浅水推移质输沙模型。该模型是基于应用矩方法的浅水Exner模型,使之有可能恢复的垂直结构的流动。这种方法使我们能够获得接近底部的流体速度的更好的近似值,这是沉积物输运的相关速度。本文给出了一个适用于任意阶多项式流速剖面的通用浅水Exner矩模型。正则化确保双曲性和容易计算的特征值。该系统解决了这里提出的一个适应IFCP计划。该IFCP格式的改进是基于对泥沙输移特征值的近似。数值试验处理大,短的时间尺度。所提出的模型允许获得的流体,从而在一个更好的描述推移质输运的沉积层的垂直结构。

英文摘要:

In this work a simple but accurate shallow model for bedload sediment transport is proposed. The model is based on applying the moment approach to the Shallow Water Exner model, making it possible to recover the vertical structure of the flow. This approach allows us to obtain a better approximation of the fluid velocity close to the bottom, which is the relevant velocity for the sediment transport. A general Shallow Water Exner moment model allowing for polynomial velocity profiles of arbitrary order is obtained. A regularization ensures hyperbolicity and easy computation of the eigenvalues. The system is solved by means of an adapted IFCP scheme proposed here. The improvement of this IFCP type scheme is based on the approximation of the eigenvalue associated to the sediment transport. Numerical tests are presented which deal with large and short time scales. The proposed model allows to obtain the vertical structure of the fluid, which results in a better description on the bedload transport of the sediment layer.

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