2018年6月上海近海海域潮流特征分析

采用短期资料的潮流准调和分析方法,对2018年6月上海近海海域9个站位的同步潮流资料进行分析.分析结果表明:该海域潮流涨落潮不等现象显著,大部分站位的落潮流历时长于涨潮流历时,长江口内(C1～C3)落潮流最大流速远大于涨潮;该海域基本以半日潮为主,同时存在规则半日潮和不规则半日潮,考虑到该海域浅海分潮流具有较大的比重,...

Quasi-harmonic Analysis of Tidal Current Data Collected from Anchored Stations in Shanghai Sea Area

Using the quasi-tidal current method and short term data,the synchronous tidal current data at 9 stations in Shanghai’s offshore waters in June 2018 were analyzed.The results show that there is remarkable flood-ebb time-asymmetry for the tidal current.The ebb tide of most stations last longer than the rising tide,and the maximum flow velocity of the ebb tide currents in the Yangtze River estuary(C1~C3)is much larger than the flood tide;the sea area is basically dominated by semi-diurnal tide.The main semi-diurnal tide and the irregular semi-diurnal tide exist at the same time.Considering that the shallow sea tidal current of the sea area has a large proportion,the tidal current property should be the type of irregular semi-diurnal tidal shallow sea current.The dominant movement form at each station is reflow;the residual flow velocity at most stations is surface>0.6 H layer>bottom layer,which is roughly from west to east.