宁波舟山近海三维潮汐潮流数值模拟

摘要

利用FVCOM模型对宁波舟山近海的潮汐潮流进行了三维数值模拟,并对其水动力特性作了相应分析.FVCOM模型采用非结构化三角形网格,很好地解决了精确拟合宁波舟山群岛的复杂岸线的问题.基于计算区域内的海床性质,采用Koutitas公式对FVCOM模型的中海底摩阻系数的计算进行了改进.通过计算域内多个潮位站和海流站的实测资料验证表明,改进的摩阻系数计算公式是合理的,流场的计算结果与实测符合良好,可以用于三维污染物扩散和泥沙输移计算.%By means of FVCOM model,the tide and tidal currents in the seas adjacent to Ningbo and Zhoushan were simulated.Furthermore,the dynamic characteristics of tide were analyzed.The grid system of FVCOM model was unstructured triangle mesh,which solved the accurate fitting of complex of Ningbo and Zhoushan shoreline.Based on the property of seabed in the calculation zone, Koutitas formula was used to instead of the original calculation method of drag coefficient in FVCOM.Comparing the computed values with those tidal observatories, the improved formula proved to be reasonable and the two values are in good agreement.The computed model can be used for 3D pollutant concentration and sediment transport calculation.