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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Numerical simulation of the inception of channel meandering
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Numerical simulation of the inception of channel meandering

机译：通道曲折开始的数值模拟

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The inception of channel meandering is the result of the complex interaction between flow, bed sediment, and bank material. A depth-averaged two-dimensional hydrodynamic model is developed to simulate the inception and development of channel meandering processes. The sediment transport model calculates both bedload and suspended load assuming equilibrium sediment transport. Bank erosion consists of two interactive processes: basal erosion and bank failure. Basal erosion is calculated from a newly derived equation for the entrainment of sediment particles by hydrodynamic forces. The mass conservation equation, where basal erosion and bank failure are considered source terms, was solved to obtain the rate of bank erosion. The parallel bank failure model was tested with the laboratory experiments of Friedkin on the initiation and evolution processes of non-cohesive meandering channels. The model replicates the downstream translation and lateral extension of meandering loops reasonably well. Plots of meandering planforms illustrate the evolution of sand bars and redistribution of flow momentum in meandering channels. This numerical modelling study demonstrates the potential of depth-integrated two-dimensional models for the simulation of meandering processes. Copyright (c) 2005 John Wiley & Sons, Ltd.
机译：河道曲折的开始是水流，床层沉积物和河岸物质之间复杂相互作用的结果。建立了深度平均的二维流体动力学模型，以模拟河道蜿蜒过程的发生和发展。泥沙运移模型在假设泥沙运移平衡的情况下，计算了床荷载和悬浮荷载。堤岸侵蚀包括两个相互作用的过程：基础侵蚀和堤岸破坏。从新推导的方程式计算出基础侵蚀，该方程式是通过水动力将夹带的沉积物颗粒夹带的。求解了质量守恒方程，其中将基础侵蚀和堤岸破坏视为源项，以求得堤岸侵蚀率。平行堤岸破坏模型通过弗里德金的实验室实验在非粘性弯曲通道的形成和演化过程中进行了测试。该模型相当好地复制了曲折环的下游平移和横向延伸。蜿蜒曲折的平面图说明了砂杠的演变以及蜿蜒河道中水流动量的重新分布。这项数值模型研究证明了深度集成二维模型在模拟弯曲过程中的潜力。版权所有（c）2005 John Wiley＆Sons，Ltd.

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