近岸波浪作用下污染物运动数值研究

近岸波浪是影响污染物输移扩散的重要水动力因素之一.波浪对污染物输移扩散的影响主要有波浪扰动造成的水体紊动系数的增大和波浪破碎后形成的波生流对污染物输移作用.结合基于波作用守恒方程和光程函数方程的近岸波浪模型、三维水动力模型,以及污染物输移扩散模型,对波浪传播过程中污染物离散系数变化以及波浪破碎后形成的波生流中的污染物输移进行了数值模拟.模型基于非结构化网格,可用于大范围波流以及污染物的耦合计算.数值结果与解析值以及实验结果进行了对比,验证了模型的精度和适应性.

Numerical study of pollutant motion under water waves in near-shore zone

The wave is an important hydrodynamics influence factor on pollutant transport and diffusion. In the process of wave propagation the water perturbations would make the water turbulence factor increasing and the wave-induced current by wave breaking would affect pollutant transport. By combining the near-shore wave model which is based on the wave action balance equation and the eikonal equation the 3D current model and pollutant movement model the change of dispersion coefficient in wave propagation and the transport of pollutants by wave-induced current are simulated. The coupled model is based on unstructured meshes which is fit to simulate wave coupled with current and pollutant over the large-scale near-shore region. The numerical results are compared with analytical values and the experimental data to verify the accuracy and adaptability of the coupled model.