泥沙输运与海床演变对曹妃甸港口工程的响应特征

Responses of Sediment Transport and Bed Evolution to Caofeidian Harbour Project

采用Delft3D软件建立了波流共同作用下曹妃甸海域三维泥沙输运与海床演变数学模型,使用2012年实测潮流和含沙量对模型进行验证.运用验证后的数学模型对2012年曹妃甸工程的泥沙输运和海床演变进行模拟,从而分析泥沙输运与海床演变对港口工程的响应特征,得出以下结论:曹妃甸海域含沙量较低,小于0.2kg·m-3,呈现在平面上为西部高、东部低,滩地高于外海,在垂向上为由表层至底层增大的特点;甸头、西部滩地和东坑坨海域为主要冲刷区,西部深槽和东部老龙沟深槽为主要淤积区.海床一年的冲淤演变总体在0.5m以内,海床是动态稳定的,冲刷率和淤积率均是港口运行可接受的.

A 3D numerical model of sediment transport and bed evolution of Caofeidian sea area under the combined forces of tidal current and wave was established based on Delft3D. This model was validated with the field measured tidal flow and sediment concentration in 2012. The validated model was used to simulate flow and sediment concentration fields and morphology evolution under the scenario of 2012. The responses of sediment transport and bed evolution were analyzed. The results show that： the sediment concentration in Caofeidian sea area is low, normally less than 0.2kg · m 3, its horizontal distribution presents higher in the west than in the east, and also in the nearshore and shoal areas than in the offshore area, while vertically increases from the surface to the bottom generally; the main erosions occur around Caofedian foreland, nearshore and shoals in the west and Dongkengtuo, the severe sedimentations appear in the western deep channels and Laolonggou creek. In general, the annual bed evolution is less than 0.5m and the morphology is stable with acceptable erosion and sedimentation rates.