A fully coupled numerical simulation for surface runoff and soil water movement
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摘要: 针对降雨径流从坡面流下的过程中会发生下渗,导致土壤水非饱和带含水率增大这一动力学过程,从物理机制上对土壤水和地表水进行耦合,将二维平面地表水模型叠置在土壤水模型的顶部,对土壤水、地表水模型进行相同的空间和时间离散,在模型的计算过程中通过达西流关系对两者之间的水量交换进行计算(双层结点法耦合)或整合离散方程的整体法进行耦合。通过对两种耦合方法的比较以及与前人的实验结果对比,该模型与耦合方法能够准确地模拟和预测地表径流与土壤水分运动过程。研究结果可为分析地表水流与饱和-非饱和带水分与溶质耦合机理提供理论支持。Abstract: Aiming at this dynamic process that the infiltration will be occurred when the rainfall runoff flows down from a slope surface and the caused increase of soil water content in an unsaturated zone, the soil water and surface water were coupled from the physical mechanism in this paper. A two-dimensional plane model of the surface water was superimposed on top of a soil water model, and the same spatial and temporal discretizations were maintained for both models. In addition, during the calculation process for the models, the water exchange between the surface and soil water was calculated (double node analysis coupling) or a global approach integrating the discretization equation was coupled. Comparing the two coupling methods and compared with previously published experimental results, the model and coupling method in this paper can be used to accurately simulate and predict the movement processes of surface runoff and soil water. The research results of this paper can provide theoretical support to analyze surface water flow and the coupling mechanism of the water content and solute between saturated and unsaturated zones.
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Keywords:
- surface runoff /
- soil water /
- water exchange /
- unity coupling
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期刊类型引用(12)
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