| 夏季风场对长江冲淡水扩展影响的数值模拟 |
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| 引用本文： | 朱建荣,李永平,沈焕庭.夏季风场对长江冲淡水扩展影响的数值模拟[J].海洋与湖沼,1997,28(1):72-79. |
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| 作者姓名： | 朱建荣 李永平 沈焕庭 |
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| 作者单位： | 上海华东师范大学河口海岸国家重点实验室!上海，200062(朱建荣，沈焕庭)，上海台风研究所!上海，200030(李永平) |
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| 基金项目： | 国家自然科学基金!49406070，上海市青年科技启明星资助 |
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| 摘 要： | 建立一个σ坐标系下三维非线性斜压陆架模式，研究长江冲淡扩展的动力机制。数值试验再现了夏季长江冲淡水转向东北的现象，夏季风场对长江冲淡水扩展的影响，取决于风速的大小和动向，风速为３ｍ／ｓ的南风，对冲淡水向北扩展的影响比较明显，而当南风风速达到６ｍ／ｓ时，则起着十分显著的作用，西南风加强了冲淡水向东扩展，但对南北向的扩展影响甚微，东南风抑了冲淡水向东扩散，并使之偏向西北，明确阐明了夏季风场对冲淡水扩展
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| 关 键 词： | 长江冲淡水 扩展 风场 数值试验 外海区 |
| 收稿时间： | 1995/8/21 0:00:00 |
| 修稿时间： | 1/3/1996 12:00:00 AM |
NUMERICAL SIMULATION OF THE WIND FIELD'S IMPACT ON THE EXPANSION OF THE CHANGJIANG RIVER DILUTED WATER IN SUMMER |
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| Zhu Jianrong,Li Yongping and Shen Huanting.NUMERICAL SIMULATION OF THE WIND FIELD'S IMPACT ON THE EXPANSION OF THE CHANGJIANG RIVER DILUTED WATER IN SUMMER[J].Oceanologia Et Limnologia Sinica,1997,28(1):72-79. |
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| Authors: | Zhu Jianrong Li Yongping and Shen Huanting |
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| Affiliation: | State Key Laboratory of Estuarine and Coastal Research,East China Normal University Shanghai 200062;Shanghai Typhoon Institute,Shanghai 200030;State Key Laboratory of Estuarine and Coastal Research,East China Normal University Shanghai 200062 |
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| Abstract: | A three-dimension nonlinear baroclinic and continental shelf model with primitive equations in O coordinate system was developed to study the dynandc mechanism of the expansion of the Changiiang River diluted water. The calculation domain is the whole East Chna Sea. The horizontal resolution of the model is 7.5 x 7.5,and the vertical resolution is 11 layers. The ocean control equations were discreted in a completely staggered grid system, and the Alternating Direction Implicit (ADI) scheme was adopted for the numrical resolution. The send -momentum scheme which is quadratic conservation was adoptcd for the nonlinear terms in the momenturn equations. The upstrearn and implicit scheme were used for the advection terms and the vertical eddy diffusion and convection terms in the temperature and salt equation,respectively. Considering the factors of the Taiwan Warm Current, Kuroshio, coastal current, wind stress and topography, the numerical experiment showed the northeast expanding freshwater tongue and the circulation structure in the East China Sea in sununer. The effect of the south wind field on the expansion of the Chanaiiang hiver diluted water in sufnmer is detendned by the monthly averaged wind speed and direction. At 3 m /s, the south Wind obvious expands the diluted water northward; at 6 m /s, the south wind very obviously makes the diluted water expand northward along the Subei coast. The southwest wind enhanees the eastward expansion of the diluted water, but has a very little effect on its southward expansion. The southeast wind turns the diluted water's eastward expansion northwestward. |
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| Keywords: | Changjiang River diluted water Expansion Wind field in summer Numerical experiments |
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