摘要
本调查海域位于深浅急剧变化的大陆架边缘区域，海水流动相当复杂，既有半日和周日变化的潮流，又有变化周期较长的所谓节流，既有西北本乎洋强大的黑潮流经这里，又有受到长江等大河入海径流涵养的沿岸流在此汇合。在浅水的大陆架水域，一般潮流较常流明显，有的区域潮流比常流大一个量级，而深水的东海海盆，
The contents dealt with in this section can be divided into three parts. The first part is the current field of dynamic calculation in the southern part of the investigative water area. Based on the observed temperature and salinity data collected from four cruises dynamic calculations are carried out for Sections F and 拢, the dynamic zero level adopted being 800db. According to the calculated results, the authors discuss the distribution characters and seasonal variaton of the Kuroshio and Tsushima Current, and the branch conditions of the Tsushima Current as well. The second part is the observed residual current. Data show that there exists a stable northward current of which the magnitude is 10 cm/sec all the year round at Station D8 being situated in left side of Tsushima Main Current. While at the Station D4, being located in the offshore of the Changjiang River Estuary, the residual current is unstable. The third part is tidal current analysis. Harmonic constants of six principal tidal current constituents and elliptic factors of tidal currents are computed on the basis of the observed data. The discussions are centered on the variation rules of tidal current characters with depth at the Stations D4 and D8.
