| 摘要: |
| 河口海岸海洋模式时间差分为欧拉前差格式,在涡动粘滞系数较小的情况下,模式存在着弱不稳定性。为提高模式的稳定性,采用预估修正法对模式中科氏力项作半隐式处理。首先在理论上证明了模式稳定性的提高,随后设计一个高分辨率网格,考虑实际岸线和水深、边界通量、密度梯度力和风应力,把模式应用于冬季渤、黄、东海环流的数值模拟,数值试验也证明了模式稳定性的提高。改进后的河口海岸海洋模式较成功地模拟出了冬季渤、黄、东海环流(黑潮、台湾暖流、对马暖流、黄海暖流和沿岸流),与实际观测和研究结果较为一致。
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| 关键词: 河口海岸海洋模式,预估修正法,模式稳定性,渤、黄、东海环流 |
| DOI：10.11693/hyhz200201003003 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目,49406070号;高等学校博士学科点专项科研基金资助项目,97026916号 |
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| IMPROVEMENT OF THE STABILITY OF THE ESTUARINE COASTAL OCEAN MODEL BY A PREDICTOR-CORRECTOR SCHEME |
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ZHU Jian-Rong, YANG Long-Hui, ZHU Shou-Xian
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State Key Laboratory of Estuarine and Coastal Research,East China Normal University
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| Abstract: |
| The time difference in the Estuarine Coastal Ocean Model with semi-implicit scheme (ECOM-si) is the Euler forward scheme.The model has a weak instability in the case of low eddy viscosity.We adopted a predictor-corrector scheme to change the Coriolis terms in the model equations into a semi-implicit scheme, and proved theoretically that the model stability is improved.By designing a high resolution grids and considering the real coasts and bottom topography, the combination of the transports at the open boundaries, density gradient forcing and wind stress, the modified model was applied to numerical simulate the circulation in the Bohai,Yellow and East China Seas in winter.The model stability was improved on the basis of evidence from numerical experiments.The modified Estuarine Coastal Ocean Model reconstructed fairly successful the circulation patterns of Kuroshio, Taiwan Warm Current, Tsushima Warm Current,Yellow Sea Warm Current and coast currents.The simulated results are fairly consistent with the previous observations and studies.
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| Key words: Estuarine coastal ocean model, Predictor-corrector scheme, Model stability, Circulation in Bohai, Yellow and East China Seas |
