| 河口环流和盐水入侵I--模式及控制数值试验 |
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| 引用本文： | 朱建荣,胡松,傅得健,吴辉.河口环流和盐水入侵I--模式及控制数值试验[J].中国海洋大学学报(自然科学版),2003,33(2):180-184. |
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| 作者姓名： | 朱建荣 胡松 傅得健 吴辉 |
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| 作者单位： | 华东师范大学河口海岸国家重点实验室,上海200062 |
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| 基金项目： | 上海市曙光学者计划项目(99SG12)、上海市青年科技启明星计划项目(99QMH1404)、高等学校骨干教师资助计划项目资助 |
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| 摘 要： | 本文应用ECOM模式,设计1个控制试验,研究理想河口环流和盐水入侵的动力过程.数值计算结果表明,盐水入侵产生盐度锋面,在锋面处底层存在着向陆的密度流,为保持断面上质量连续,上层的流速趋于增大;近口门附近底层流有偏南分量,表明有横向环流存在.在口门外因斜压和底形的作用,产生明显的上升流.盐水入侵在空间上具有不对称性,高盐水位于北岸的下层.在拦门沙上游出现上下2个相反方向的横向环流,而在口门处只出现1个顺时针方向的横向环流.从动力机制上分析了盐水入侵的空间不对称性和横向环流的产生.
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| 关 键 词： | 理想河口 河口环流 盐水入侵 三维模式 数值试验 |
| 文章编号： | 1001-1862(2003)02-180-05 |
| 修稿时间： | 2002年2月7日 |
Estuarine Circulation And Saltwater Intrusion Ⅰ:Model And Controlnumerical Experiment |
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| Zhu Jianrong,Hu Song,Fu Dejian,Wu Hui.Estuarine Circulation And Saltwater Intrusion Ⅰ:Model And Controlnumerical Experiment[J].Periodical of Ocean University of China,2003,33(2):180-184. |
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| Authors: | Zhu Jianrong Hu Song Fu Dejian Wu Hui |
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| Abstract: | By using the ECOM model, designing a control experiment, the dynamic processes of estuarine circulation and saltwater intrusion in an idealized estuary are studied. The results of numerical calculation show that the saltwater intrusion produces a salinity front, there exists a land-ward density induced current under the salinity front, and the current speed at the upper layer increases remarkably due to mass continuity through the transverse section. There is a southward component of current at the lower layer near the estuary mouth, and this means there exists a transverse circulation. The interaction of the baroclinicity and the bottom off the mouth produces an obvious upwelling. The saltwater intrusion is of asymmetry, the water of higher salinity, locates at the lower layer and near the north coast. There exist two upstream transverse circulations above the sand bar in which the lower one is clockwise and the upper one is anticlock wise, while there is only one clockwise transverse circulation near the mouth. The asymmetry of the saltwater intrusion and the genaration of the transverse circulation are analyzed in view of dynamic mechanism. = |
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| Keywords: | idealized estuary estuarine circulation saltwater intrusion 3-D model numerical experiment |
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