Vertical feature of the tidal current in the north of the East China Sea based on a moored buoy

Based on the ocean current data observed by a moored buoy in the north of the East China Sea for two and a half months,the special structure characteristics of tidal current and the information of the residual current in the observed area were studied using the harmonic analysis method.The results show that it is dominated by the semidiurnal tide in this area.The type of tidal current in the depth less than 40mbelongs to irregular semidiurnal tide,while it belongs to regular semidiurnal tide in the depth more than 40m.The tidal current is dominated by clockwise rotation in this area,and the proportion of the tidal current accounted for the ocean current increases with the depth.There are significant vertical variations in the tidal current ellipses elements.This research work will be helpful for understanding the vertical feature of tidal current in this area and the observed data can be provided to calibrate the ocean model on tidal current.