| A high resolution hydrodynamic model was established using an unstructuredtriangular grid, finite-volume coastal ocean model （FVCOM） to study the tides andtidal currents of northern South China Sea. The simulation results were in goodagreement with observation data. According to the simulation results, the tidal andtidal currents characteristics of M2, S2, K1, O1was analyzed. With the application ofhigh resolution triangular gird, the characteristics of tide and tidal currents aroundDongSha Islands were computed more exactly and analyzed more detailed thanbefore. The simulated tidal constituents were more accurate than previous study.The results show that the areas between ShenQuan port and JiaZi port aredominated by regular diurnal tide and Pearl River Estuary is expressed irregularsemi-diurnal tide, the tidal characteristic of other areas are irregular diurnal tide; Thecontinental shelf area is dominated by rectilinear, while the area near continental slopeis characterized by strong rotary current, The shelf break area is the boundary betweenirregular diurnal and irregular semi-diurnal tidal currents. DongSha areas aredominated by irregular diurnal tidal currents in which the currents rotates clockwise.The maximum speed of various sub-tidal changes small in the vertical direction, at thebottom the maximum speed decreases rapidly but the rotation rate increases. Thedistributions of the maximum possible current velocities are paralleled with the waterdepth. The possible velocities is especially higher around DongSha Islands and themaximum velocity can reach70cm/s near Taiwan Strait; For Northern South ChinaSea, The tidal motion is maintained by the Ocean tides from bashi channel, which isdivided in to three different forms out of Northern South China Sea. The maximumresidual currents appeared on the west of Taiwan Strait, which flow into Taiwan Straitfrom south to north at a speed of6cm/s. The coastal residual currents flow along theChina Shore from east to west. |
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