黄茅海波-流共同作用下的三维悬沙数值模拟

针对黄茅海河口区波流相互作用显著、三维空间结构明显及泥沙运动复杂等特点,联合第3代海浪模式SWAN,建立了波流共同作用下的三维悬沙数学模型.在水流计算中,考虑了波浪产生的辐射应力影响,波浪依赖的表面风应力影响及波浪影响下的底部剪切应力,并采用k-kl紊流闭合模型提供垂向涡粘系数和垂向扩散系数.悬沙扩散方程中的源函数利用切应力法确定,泥沙沉降速度考虑絮凝作用,从而提高黄茅海悬沙场数值模拟精度.通过含沙量实测资料验证,模拟值与实测值符合较好.在模型验证的基础上,讨论了不考虑波浪与考虑波浪两种情况下黄茅海的悬沙分布特征,为工程实际研究提供了依据.

Three-dimensional numerical simulation of suspended sediment under wave and current in huangmao sea

Considering the distinct mutual effect of wave and current,the obvious three-dimensional space structure and the complex sediment movement at the estuary of Huangmao Sea,a three-dimensional mathematical model of suspended sediment under the combined effect of wave and current was established,with the help of Sea Wave Model III-SWAN.As for the hydrodynamic calculation,the influence of radiation stress caused by wave,surface wind stress resulted to wave,and bottom shear stress under the combined effect of wave and current were considered.K-kl turbulence closure model was adopted to provide vertical eddy viscosity coefficient and vertical diffusion coefficient.The source function in the convective diffusion term was determined by the shear stress,and the flocculation was considered in the sedimentation velocity of suspended sediment,thereby the numerical simulation accuracy of suspended sediment field in Huangmao Sea was increased.The observed data show that the simulated values accord with the observed values on the whole.On the basis of model verification,the two kinds of different distribution characteristics of the suspended sediment were discussed.considering wave and without regard to wave.It can be applied for further study.