粘性-地形修正项对潮汐数值模拟影响的研究  

Study of Viscous-terrain Correction Term Effect on Tidal Numerical Simulation

作　　者：曲大鹏[1,2] 吕新刚[1,2] 于华明[3,4] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]海洋环境科学和数值模拟国家海洋局重点实验室,山东青岛266061 [3]中国海洋大学海洋环境学院,山东青岛266100 [4]Institute of Oceanography,University of Hamburg

出　　处：《海洋科学进展》2011年第3期285-292,共8页Advances in Marine Science

基　　金：国家自然科学基金项目--北部湾与黄海夏季环流三维结构的比较研究(40806016)

摘　　要：目前近海海洋模型大多从近海地形变化剧烈和细化浅水分层两个方面综合考虑,垂向坐标通常采用σ坐标变换,并且一般情况下均忽略了在坐标转换过程中出现的粘性-地形项。以POM海洋数值模式(Princeton OceanModel)为基础,在对渤、黄、东海M_2分潮潮波的模拟中,具体分析了ε_u,ε_r,ε_s粘性-地形修正项对东中国海M_2分潮波系统数值模拟的影响。研究发现,加入粘性地形修正项后,可以增加模型中的耗散作用,使黄海西部M_2分潮模拟振幅减小约1～2 cm,渤海海区M_2分潮模拟振幅减小约4～5cm,在这两个区域潮汐振幅的减小会使得模拟结果偏离于实际观测结果,而在济州岛、长江口区域的模拟潮汐振幅约减小1～3cm,则会使模拟值更加接近于实际观测结果。从模型与90个验潮站的对比结果来看,粘性-地形修正项的作用范围相对较小,其整体影响并不很明显,但在某些特殊区域中该项对模型的输出结果有较为明显的影响。At present, coastal topographic irregularity and fine layer structure in shallow water are jointly considered in the most of coastal sea models, and a-coordinate transformation is normally used in the vertical direction. Howerer the viscous-terrian correction terms are neglected in the most models with the σ-coordinate transformation. Based on the POM ocean numerical model, the εu,εT and εS viscous-terrian correction term effects on the simulation for the M2 tidal component in the Bohai, Yellow and East China Seas are analyzed in this study. As it is learnt from the study, the dissipation action becomes increased in the model with the correction terms taken into consideration, the simulated M2 amplitude is about 1-2 cm reduced in the western Yellow Sea and about 4-5 cm in the Bohai Sea, making the simulated amplitude further deviate from the observed. On the other hand, the simulated M2 is further close to the observed in the Cheju island area and the Yangtze River estuary although the simulated M2 amplitude is about 1-3 cm reduced. As shown in the comparison between the model results and the observations at the 90 tidal gauges, the correction term effects are not significant and limited in a little sea area, except in very special area.

关 键 词：潮波 σ坐标变换 粘性-地形修正项 渤、黄、东海 

分 类 号：P731.23[天文地球—海洋科学]