Theoretical model for nearshore open channel evolution under the action of crosscurrent
The nearshore waterway often experiences deviation of the channel axis and changes in cross-section shape under the action of cross-current.In this paper,a theoretical model has been constructed that can repro-duce the evolution process of channel axis and cross section under the action of crosscurrent.The seabed de-formation equations caused by the movement of bedload and suspended sediment are averaged and simplified during the tidal period,and the Gaussian distribution function is used to generalize the channel section to ob-tain of the model equations of the channel section changing with time under the action of crosscurrent.After applying the new model for the study of the evolution of the 300 000 tons deep-water channel in Lianyungang Port and the Hai'an channel in the Qiongzhou Strait under the action of near-shore crosscurrent,it is found that the axis of the Lianyungang channel shifts by about 5 m per year and the Hai'an channel shifts by about 10 m per year under the action of crosscurrent.The results also reproduce the phenomenon of shallowing water depth,widening in channel width,and slightly greater change of frontal surface than backwater surface in both channels under the action of crosscurrent.
万方数据
维普
