| 摘要: |
| 基于正交曲线坐标的ECOMSED 三维水动力模式, 并考虑了潮汐、风和实测温盐场,诊断计算了渤海夏季三维潮致-风生-热盐环流, 分析了渤海夏季潮致余流、风生和热盐环流的分布结构。结果显示, 在夏季, 渤海中部海区明显存在一个顺时针向的涡旋, 同时渤海还存在着多个逆时针向的涡旋。通过分析和比较各个分量在总环流中的作用, 认为夏季潮致余流是相对弱的; 热盐环流在夏季总环流中占主要成分。 |
| 关键词: 潮致余流, 风生-热盐环流, ECOMSED 模式,渤海 |
| DOI： |
| 分类号: |
| 基金项目:国家重点基础研究发展规划项目, G1999043804号 |
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| NUMERICAL DIAGNOSTIC SIMULATION OF SUMMERTIME TIDE-INDUCED,WIND-DRIVEN AND THERMOHALINE CURRENTS IN THE BOHAI SEA |
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WAN Xiu-Quan, BAO Xian-Wen, WU De-Xing, JIANG Hua
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Institute of Physical Oceanograhy , Laboratory of Physical Oceanography , Ocean University of China
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| Abstract: |
| The Bohai Sea is a shallow, sem-i closed gulf with an average water depth of 18 m. A large number of numerical studies have previously been undertaken on tide and the circulation. However, the interrelationships between tide-induced,wind-driven and thermohaline currents in summertime are currently poorly understood. Using thermohaline data collected in August 2000 and annual wind field data in the Bohai Sea, a three-dimensional ECOMSED model incorporating Mellor & Yamada level 2.5 turbulent closure model was used to diagnostically compute tide-induced residual currents, wind-driven and thermohaline currents in the Bohai Sea with an orthogonal curvilinear grid system. Factual topography and shore shape were both considered.The results were verified using the measured data and previous model results. The results show that there was a clockwise circulation in the middle Bohai Sea during summertime with some counter- clockwise circulations in the mouth of Bohai Bay, the middle of Liaodong Bay and the north of Bohai Strait. The trend of the summer circulations in the Bohai Bay is ant iclockwise in the north and clockwise in the south, with a'two loop'structure. In addition the differences between tide-induced residual currents wind-driven and thermohaline currents were compared and analyzed. Tides and tidal currents were well reproduced, showing a high level of agreement with previous research. The model results indicate that in the Bohai Sea during summertime, the tide-induced residual currents are weak while the thermohaline currents are strong and dominant. |
| Key words: Tide-induced residual currents, Wind-driven and thermohaline currents,ECOMSED model, Bohai Sea |
