计算河流动力学理论体系框架探讨

计算河流动力学重在研究河流动力的时空变化,实质上是计算流体力学、计算土力学在河流动力学中的应用,但并非简单组合,主要难点源自相间作用机理复杂性及研究对象多尺度性所导致的应用可行性问题。问题解决的过程中产生大量新的适于河流动力计算的数学模型和数值模型,但当前理论体系还缺乏系统性。综合河流动力学、计算流体力学、计算土力学理论,给出计算河流动力学的理论体系框架,明确计算河流动力学各部分内容的基本联系。基于此理论体系,可以方便地判断模型准确性、计算量和复杂性,构建最优的数学模型,并判断数学模型的发展方向。

Discussion of the theory of computational river dynamics

Computational river dynamics(CRD) has been developing very fast after the use of the numerical model during the past 50 years. It is of great significance to systematically organize the theory system of the CRD. CRD is mainly used to study the spatial and time variation of the river dynamics. The computational fluid dynamics(CFD),the computational soil mechanics(CSM) and the traditional river mechanics(TRM) are creatively used in CRD. But this is not simple or direct use. The main problem comes from the complex interaction in the multiphase and the multi-scale of the river system. Many new river dynamics model and the numerical technics are created in the processes that the problem is solved. However, all these technics are not systematically organized and analyzed. In this paper, all these theories are systematically organized and analyzed based on CFD and CSM. It is easily to decide the correction, complexity, application feasibility of the different models, which is helpful to choose the model when used in practice and decide the direction of development of the model.