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在河口地区,波流相互作用下紊流边界层的泥沙起动输移规律非常复杂,深入探讨其泥沙运动规律很有必要。该文基于波浪边界层的控制方程,引入了时均水流压力,通过波流相互作用下的摩阻流速反映波浪与水流的夹角,用标准k-ε模型封闭方程,建立了波流叠加的紊流边界层内的弱耦合水流模型,分别讨论了波浪速度振幅、时均流速等的分布情况,与实测数据对比得到了较好的模拟结果。其次,基于水流模型建立了泥沙模型,采用对称振荡流和波流相互作用两种情况下的泥沙实测数据验证了泥沙模型的正确性,讨论了不同分布规律的涡黏系数对于模型的影响,为实际工程提供理论参考,结果具有一定的指导意义。
In estuarine area, the law of sediment transport and start-up under turbulent boundary layer under the interaction of wave and flow is very complicated. It is necessary to study the law of sediment movement in depth. Based on the governing equations of the wave boundary layer, the time-averaged water flow pressure was introduced. The friction velocity under the wave interaction reflected the angle between the wave and the water flow. The closed equation was established by the standard k-ε model, The weak coupled water flow model in the turbulent boundary layer discusses the distribution of the wave velocity amplitude and the hourly average flow rate respectively. Compared with the measured data, good simulation results are obtained. Secondly, the sediment model was established based on the water flow model. The sediment model was validated by using the sediment data under both the symmetrical oscillatory flow and the wave-current interaction. The eddy viscosity coefficients of different distributions were discussed. Influence, provide the theoretical reference for the actual project, the result has certain guiding significance.