博贺湾海域悬沙输移机制分析

根据博贺湾海域大潮期间的水文泥沙实测资料,采用悬沙通量机制分解法将悬沙净输移通量分解为多个动力项,并分别从平流输沙、潮泵输沙和垂向净环流输沙三方面分析了悬沙输移机制。结果表明:博贺湾海域大潮期间拉格朗日余流基本沿涨潮方向,离岸越远,余流值越大,欧拉余流大小与拉格朗日余流相近,斯托克斯余流接近于零;平流输沙在悬沙净输移中占主导作用,其中欧拉余流输沙作用方向与涨落潮优势流相关;博贺湾海域潮泵效应输沙作用不强,潮泵作用由涨落潮潮流和含沙量在潮周期的不对称性引起;垂向余环流输沙作用很弱,垂向净环流输沙和拉格朗日余流和含沙量的垂向分布有关。

Analyses of mechanism of suspended sediment transport in Bohe Bay

According to measured hydrological and suspended sediment data from spring tides in Bohe Bay, the suspended sediment transport flux was divided into several dynamic items using the mechanism decomposition method, and the mechanism of suspended sediment transport was analyzed in terms of the advection sediment transport, tidal pumping effect, and vertical circulation transport. The results show that the Lagrangian residual current basically moves in the direction of the flood tide and its value increases with the distance from the shore. The Euler residual current has a value similar to the Lagrangian residual current, while the value of the Stokes residual current is close to zero. The advection is the leading factor affecting the suspended sediment transport and the transport effect of the Euler residual current is correlated with preferential flow in the tidal process. The tidal pumping effect in Bohe Bay does not have a strong influence on the suspended sediment transport, and it is induced by the asymmetry of the tidal current and suspended sediment concentration. The vertical residual circulation has a weak effect on the suspended sediment transport and is related to the vertical distributions of the Lagrange residual current and suspended sediment concentration.