中文摘要：

粉沙质海岸离岸围垦后港内淤积引人关注。基于平面二维潮流数学模型,采用网格嵌套技术,模拟了渤海、曹妃甸海域潮流场;该海域泥沙为粘性沙,且围垦后港内流速很小,采用悬沙运动数学模型模拟了潮流和波浪作用下正常天气和大风天的含沙量场,分析了大风后含沙量衰减过程,计算了正常天气年淤积强度和大风天泥沙淤积厚度。计算表明,外海泥沙主要通过甸头东侧老龙沟进入港池水域。正常天气下,港内流速小,基本处于淤积环境,但由于外海含沙量小,港池水域年淤积厚度小于10 cm。大风浪作用下,曹妃甸海域含沙量明显增大,由老龙沟进入三港池的泥沙沿程落淤,港内普遍淤积,泥沙淤积厚度在5 cm以内。

英文摘要：

Siltation in harbor basin is of great significance after offshore reclamation in silty coast. Tidal current of Bohai Bay and Ca- ofeidian sea area was simulated based on depth-averaged 2-D hydrodynamic numerical model and grid nesting techniques. Considering the cohesive sediment and weak flow in harbor basin, suspended load transport by tide and wave was simulated with and without storms. The annual siltation without storms and the siltation after a storm were calculated. Although the harbor basin is under the con- trol of deposition because of the weak flow, the annual siltation thickness is less than 10 cm owing to low sediment concentration in deep sea without storms. The sediment concentration in Caofeidian sea area will increase evidently when a storm happens. The sediment deposits along the way from Laolonggou deep channel to harbor basin. The siltation thickness will be less then 5 cm in harbor basin.