北黄海定点连续观测站海流资料分析

发布时间：2018-02-27 06:08

本文关键词： 北黄海潮流调和分析垂直模态　出处：《海洋与湖沼》2017年04期 　论文类型：期刊论文

【摘要】：本文利用2009年6月至11月期间的ADCP海流资料,研究了獐子岛附近一个固定观测点处的时间平均流及潮流特征。结果表明,该海区的平均流大致沿等深线方向,从黄海流向渤海,整个观测期间纬向平均流大于经向平均流,经向1m宽度范围内的纬向净水体输运量为0.67m3/s,而纬向1m宽度内的经向净水体输运量为0.16m3/s;垂向上可以15m和47m为节点分为三层,15m大致为温跃层深度,而47m以下为底摩擦影响显著的范围。夏季的温盐层化结构对于余流的垂直分布存在显著影响。潮流调和分析表明,该海区的潮汐类型为正规半日潮,M_2和K_1分潮在整个深度范围内的平均振幅分别为27.9cm/s和9.2cm/s,半日潮流由表及底均为旋转流,而全日潮流更趋向于往复流。在垂向上,各个分潮的潮流椭圆均随深度发生小幅度的旋转,半日潮流椭圆随深度逆时针旋转,倾角变化小于30°,全日潮流椭圆随深度顺时针旋转,倾角变化小于40°。潮流在近底层受到底摩擦的影响十分显著,其中全日潮流受到底摩擦的影响较半日潮流大。本次观测是进一步研究北黄海区域潮流、近惯性流动与水体交换输运的直接参考,其结果加深了对该区域流场特性的认识和理解。
[Abstract]:Based on the ADCP current data from June 2009 to November, the characteristics of time mean current and tidal current at a fixed observation point near Swertia Island are studied. The results show that the average current flows from Huang Hai to the Bohai Sea from Huang Hai along the isobath direction. The zonal average current is larger than the meridional average flow during the whole observation period. In the meridional width range of 1m m, the transport capacity of the meridional purified water body is 0.67 m3 / s, while that of the meridional purified water body in the zonal width is 0.16 m3 / s. The vertical node can be divided into three layers of 15m and 47m, and the depth of thermocline is approximately 15m. The temperature and salt stratification structure in summer has a significant effect on the vertical distribution of residual flow, and the tidal current harmonic analysis shows that the temperature and salt layer structure has a significant effect on the vertical distribution of residual flow. The average amplitudes of the normal semi-diurnal tide M _ 2 and K _ s _ 1 in the whole depth range are 27.9 cm / s and 9.2 cm / s, respectively. The semi-diurnal currents are rotated from the surface and bottom, while the all-day tidal currents tend to reciprocate. Each tidal current ellipse rotates in a small amplitude with the depth, the semi-diurnal tide ellipse rotates counterclockwise with the depth, the inclination angle changes less than 30 掳, and the full-day tidal current ellipse rotates clockwise with the depth. The variation of inclination angle is less than 40 掳. The effect of the friction on the near bottom layer of the tidal current is very significant, and the full-day tidal current is more affected by the friction at the end of the day than the semi-diurnal tide. This observation is to further study the tidal current in the northern Huang Hai region. The results of the direct reference of near-inertial flow and water exchange and transport deepen the understanding of the characteristics of the flow field in the region.
【作者单位】：中国海洋大学海洋与大气学院;
【基金】：国家自然科学基金项目,41476002号国家重点研发计划项目,2016YFC1402304号山东省重点研发计划项目,2016ZDJS09A02号
【分类号】：P717

【相似文献】