摘要
基于天津港主航道连续观测点31d的实测海流资料,利用调和分析对主航道潮流和余流特征进行研究,同时结合同步风速资料研究风对表层余流的影响。结果表明:(1)航道附近属于弱流海区,表层平均流速为31.4cm/s,流速总体上由表至底逐渐减小,流速方向大致集中在NW—SE向。(2)观测海域潮流以正规半日往复潮占主导,优势分潮为M2,浅水分潮较为显著,涨潮流流速大于落潮流流速。(3)观测期间表层平均余流流速为2.8~13.8cm/s,随着深度增加余流流速逐渐减小,方向大多为NW向。该站表层余流受风的影响显著,东南风将使余流方向偏向西北。
The characteristics of the tidal and residual currents were investigated via the harmonic analysis based on the 31-day duration current observations at S station near the main channel of Tianjin Port.Effects of the local wind on the surface residual currents were explored in combination with the simultaneous wind velocities data.It is found that:(1)Tianjin Port belongs to the weak-current sea area,and the average velocity of the surface currents is about 31.4 cm/s.The current velocity generally decreases from the top to the bottom,and the main current direction is along the northwest-southeast.(2)The sea area is dominated by the regular semidiurnal tidal currents with a significant to-and-fro movement.The dominant tide component is M2,and the shallow water tide is also remarkable over there.The flood currents velocities are larger than the ebb currents.(3)The average residual currents during the observation period are between 2.8 cm/s and 13.8 cm/s.The current velocity decreases as the depth increases,and the main current direction is along the northwest.The residual currents in the surface layer of the station are dramatically affected by the local wind,and the southeast wind shifts the residual currents to northwest.
作者
张安民
宁一伟
王晨旭
张豪
刘荣霞
孙朝辉
ZHANG An-min;NING Yi-wei;WANG Chen-xu;ZHANG Hao;LIU Rong-xia;SUN Chao-hui(School of Marine Science and Technology,Tianjin University,Tianjin300072,China;Tianjin Port Environmental Monitoring Engineering Center,Tianjin300072,China;Second Institute of Oceanography,MNR,Hangzhou310012,China)
出处
《海洋学研究》
CSCD
北大核心
2019年第1期75-82,共8页
Journal of Marine Sciences
基金
国家重点研发计划基金项目资助(2018YFC1407400)
天津市科技支撑计划基金项目资助(2015F3-0004)
关键词
天津港
调和分析
潮流
余流
Tianjin Port
harmonic analysis
tidal currents
residual currents
