摘要
利用嵌套模式通过流速驱动对渤海湾的潮汐潮流进行了高分辨率数值模拟,分析了开边界条件的选取对渤海湾潮致余流模拟的影响。并用定点观测流速资料验证了在渤海湾流速作开边界条件驱动模式的模拟结果。近年来由于围海造田,使渤海湾海岸线向里推进,岸线变的更加平缓。在渤海湾新旧地形下,对渤海湾环流进行了模拟,分析了地形变化对渤海湾环流的影响。结果表明,渤海湾西北角的顺时针流环在新地形下消失,并表现为较强的逆时针流,湾口双环结构依然存在,但南部流环在新地形下由于受到西部强的逆时针流而变弱,流环半径减小。通过分析潮致Lagrange余流场和调查的污染物浓度分布特征发现,渤海湾的污染物分布特征与Lagrange余流有很强的相关性,Lagrange余流结构影响了污染物的分布特征,新旧地形下余流场的改变也导致了污染物浓度场分布特征上的变化。
The effect of selecting the open boundary condition on the simulation of tidal currents in Bohai Bay is analyzed in this paper through high resolution numerical simulation using an embedded model driven by current speed. Also, the simulation results with current speed as the open boundary condition are testified by using current speed data at fixed points. In recent years the Bohai Bay shoreline is moving toward the open sea and becoming more gentle due to the reclamation of land from the sea. The effect of variation in topography on the circulation in Bohai Bay is analyzed through simulation of both the old and new topography. The results show that in the new topography the clockwise circulation in the northwest corner of Bohai Bay disappears. Instead, there exists a strong counter-clockwise circulation~ the double circulation structure in the bay mouth remains, but the circulation in the southern part becomes weak with a shorter radius in the presence of a strong counterclockwise circulation in the western part. Through analyzing the tide-induced Lagrangian residual current, current field and pollutants＇ concentration distribution features, it is found that the two are strongly related to each other in Bohai Bay： the structure of tide-induced Lagrangian residual current affects pollutants＇ distribution features and the variation in residual current field due to topography change also causes changes in the features of pollutants＇ concentration distribution.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第1期1-6,共6页
Periodical of Ocean University of China
基金
重大基础研究前期研究专项资助(2002CCA00200)
国家高技术研究发展计划(2002AA648010)资助
关键词
潮致余流
嵌套
双环结构
tide-induced residual current
embedding
double circulation cell structure
