ANALYSIS OF CURRENT CHARACTERISTICS IN THE BEILUN ESTUARY

To study the current characteristics of Beilun estuary,a two-dimensional current mathematical model is set up and solved numerically by the finite volume method,meanwhile the model is validated by the measured hydrologic data in May 2011.The results showed that the model was better to simulate the movement of current.The distribution characteristic of current,residual current and main current constituent in the typical sections of the estuary are also analyzed and calculated,and the results reveal thated the Beilun estuary is a irregular diurnal tidal current estuary,the ebb current velocity is greater than the flood current velocity,and the duration of ebb current is longer than the flood current; the residual current is small which is mostly in 0.1m/s below,and the direction is general the same as ebb current;the amplitude of K1,O1 current constituent are greater than the M2 constituent.