Interaction of fluctuating river flow with a barotropic tide in river network of the Zhujiang Delta

Based on lots of observation data,the interaction of fluctuating river flow with a barotropic tide was analyzed by wavelet transform.It can be concluded that the periodic variation of tidal range and water level has both typical semidiurnal and diurnal and semi monthly period of tide,and 64.8 d period of river runoff,which indicates that water level of the Zhujiang Delta is controlled by tide and river flow.The inverse correlation between tidal amplitude of different river ways and river discharges is significant and the more river discharge the less tidal amplitude and tidal range;the tidal range of Sanshui Station decreases with river discharge about at 0.000 2 velocity but more slow in lower reaches of the Zhujiang River Delta.It is indicated that the tidal effect intensity and the tidal range decrease rapidly along river way because the consumed tidal energy for overcoming the resistance of river discharge increases with increasing river discharge in upper reaches;the partial tide such as D₁,D₂ and D₄ of Sanshui Station decreases significantly with increasing river discharge,but the amplitude of D₂ reduces more quickly.