Simulation Analysis of Sediment Concentration Variation in the Qiantang Estuarine Reach
The Qiantang River is an alluvial estuary with strong tidal bore,high sediment concentration and strong scouring/silting.It is of great significance to understand the variation characteristics of sediment concentration under the action of runoff and tidal current for disaster prevention,resource utilization and management of the estuary.Based on the analysis of measured water and sediment data and the method of 2D numerical simulation,this paper discussed the time-varying characteristics and spatial distribution pattern of sediment concentration in the Qiantang estuary,and explored the response of its longitudinal distribution to tidal current dynamics and river regime of Jianshan reach.The results show that the sediment concentration in the time scale of the tidal cycle is strongly time-varying,and there is a significant posi-tive correlation between the sediment concentration and the tidal range in the semilunar tidal cycle.In the longitudinal di-rection,it presents the distribution of the maximum turbidity zone with high sediment concentration and low sediment concentration at both ends from Cangqian to Cao'e mouth,and the horizontal distribution of sediment concentration along tidal variation is closely related to section morphology.The research results have reference value for enriching the law of sediment transport and estuary regulation and management.
the Qiantang Estuarysediment concentrationspatial-temporal distributionwater sediment coupling modelnumerical simulation
NETL
NSTL
万方数据
维普
