基于长期观测的辽东湾口东部海域水动力特征研究

发布时间：2018-03-04 02:29

本文选题：辽东湾　切入点：潮流　出处：《海洋学报》2016年01期 　论文类型：期刊论文

【摘要】：辽东湾口东部海域是辽东湾与渤海中部进行物质和能量交换的主要通道之一。本文利用坐底式海床基平台获取的近8个月的水动力连续观测资料,通过谱分析和调和分析方法对该海域的潮汐、潮流特征进行分析,并讨论了余流及底层温度的季节变化规律。研究结果表明:该海域潮汐属于不规则半日潮,平均潮差为0.95m,最大可能潮差为2.27m。潮流属于不规则半日潮流,M2分潮流为其优势分潮流。主要分潮流运动形式为往复流,最大流速方向为西南-东北向。余流的季节性特征较为明显:秋季,余流流速在中层达到最大,流向以西南向为主;冬季,余流流速垂向变化较小,并呈西南偏西向流动;春季,流速随深度增加而减小,流向从表层至底层呈现逆时针旋转的特征。受底层潮流、水平温度梯度及海面温度日变化的影响,底层温度表现出短期的高频变化特征:秋季,短期振荡以半日周期信号为主;冬季,全日周期信号较为显著;春季,短期振荡的现象较弱。
[Abstract]:The eastern sea area of Liaodong Bay mouth is one of the main channels for material and energy exchange between Liaodong Bay and the central Bohai Sea. The characteristics of tide and tidal current in the sea area are analyzed by means of spectral analysis and harmonic analysis. The seasonal variation of residual current and bottom temperature is discussed. The results show that the tide in the sea area belongs to irregular semidiurnal tide. The average tidal range is 0.95m, and the maximum possible tidal range is 2.27m.Tidal current belongs to irregular semi-diurnal tidal current with M2 component tidal current as its dominant sub-tidal current, and the main sub-tidal current movement form is reciprocating current. The maximum velocity direction is from southwest to northeast. The seasonal characteristics of the residual current are obvious: in autumn, the velocity of residual current reaches the maximum in the middle layer, and the direction of flow is mainly in the southwest, and in winter, the vertical change of the velocity of residual current is relatively small, and the flow is westward in the southwest. In spring, the velocity of flow decreases with the increase of depth, and the flow direction from the surface to the bottom presents a counter-clockwise rotation. Influenced by the bottom tide, horizontal temperature gradient and the daily variation of sea surface temperature, the bottom layer temperature shows short-term high frequency variation characteristics: autumn. The semidiurnal periodic signal is dominant in short term oscillation, the whole day periodic signal is obvious in winter, and the phenomenon of short term oscillation is weak in spring.
【作者单位】：国家海洋环境监测中心海洋动力室;国家海洋局第一海洋研究所海岛海洋带研究中心;上海海洋大学海洋科学学院;
【基金】：海洋公益性行业科研专项(201005008,201305043) 国家海洋局近岸海域生态环境重点实验室开放研究基金(201207)
【分类号】：P731.2

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