Analysis of spatiotemporal variations of the turbidity maximum zone in the Jiaojiang estuary
In this paper,the characteristics of the turbidity maximum zone(TMZ)in the Jiaojiang estu-ary before and after channel dredging and the influence of the TMZ on channel siltation were studied.Firstly,the hydrodynamic and sediment of the Jiaojiang estuary was numerically simulated,and the model could simulate the complex terrain and hydrodynamic sediment conditions well.Secondly,the mechanism of suspended sediment transport in the Jiaojiang estuary,the movement process of the TMZ and the changes after dredging were analyzed.The calculation of net sediment fluxes showed that the tidal pumping dominated the suspended sediment transport near the outer channel of the Jiaojiang estu-ary.The net sediment fluxes near sea side of channel were mainly in the sea direction,while that in the near land side were in the land direction.The TMZ moved back and forth with spring-neap tide and flood-ebb tide near the outer channel.The suspended sediment concentration(SSC)in the TMZ was the highest at the flood peak in a tidal cycle.After channel dredging,the position of the TMZ and SSC changed little,and there was always a high siltation area in upstream of the dredged channel.
the Jiaojiang estuaryturbidity maximum zonechannel dredgingback siltation
NETL
NSTL
万方数据
