SWAN模式对陆架浅水区有效波高的模拟研究及改进-海洋预报

SWAN模式对陆架浅水区有效波高的模拟研究及改进

单位：浙江工业大学机械工程学院能源与动力工程研究所, 浙江杭州310014

分类号：731.22

出版年·卷·期（页码）：2014·31·第四期（9-17）

摘要：

验证了QSCAT/NCEP混合风场,并将其作为SWAN模式的驱动风场。以南黄海海域作为目标区域,对SWAN模式在陆架浅水区有效波高的模拟能力进行了研究。研究表明,默认参数下SWAN模式计算的有效波高较JASON-1卫星高度计数据偏小,最大偏差达0.6m。通过对SWAN模式中各物理过程的分析,确定模式计算值偏小的原因是白浪耗散过大。采用参数修正法对白浪耗散项进行改进,将SWAN模式计算有效波高的均方根误差降低到0.16m以下,相关系数提高到0.85以上。选择2002年中具有代表性的4个月对改进后SWAN模式进行验证,结果显示SWAN模式在研究区域具有良好的稳定性和适用性。

An assessment of SWAN model in shallow shelf area was performed through the simulation of significant wave height in South Yellow Sea in this paper. The QSCAT/NCEP blended wind field was used to drive the SWAN model. The data of significant wave height calculated by SWAN model with default index were compared with the data extracted from Jason-1 satellite altimeter. Results indicated that the modeled result was smaller than the satellite result, and the maximum deviation was 0.6 meter. By analyzing the main physical process of SWAN model, the reason of data deviation is attributed to higher whitecapping dissipation. The parameters correction method of whitecapping dissipation index was presented, and has been successfully used to improve the SWAN modeling performance in shallow shelf area. The modified simulation result showed that the deviation of significant wave height decreased below 0.16 meters, and the correlation coefficient increased to more than 0.85. Finally, the modified SWAN model was used to calculate the significant wave height for four typical months in 2002. It was found that the simulation results from modified SWAN model were compatible with Jason-1 data. The modified SWAN model is suitable and stable for simulation of significant wave height in Shallow shelf area.

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