波浪作用对淤泥质河口边滩促淤后淤积影响研究

受波浪掀沙作用影响,河口边滩工程促淤效果的合理预测始终是工程泥沙研究的难题之一。在文献1]提出的淤泥质河口边滩促淤后淤积预报模式的基础上,就波浪作用对工程促淤效果影响进行了研究。通过建立长江口—杭州湾海域的平面二维水沙数学模型和波浪模型,计算不同波浪场作用下促淤工程区泥沙淤积强度。藉此,定义了波浪作用引起的淤积影响系数k0,并建立了系数k0与相对波高(波高水深)的关系。由此,结合促淤区内分级波浪数值模拟结果,给出了综合反映促淤区1 a内各级波况的影响系数统计平均值k0,并将k0代入文献1]提出的淤泥质河口边滩促淤后淤积预报模式,结果表明促淤区年淤积强度计算值与实测值吻合较好。

Influence of wave action on deposition after reclamation in muddy coast

A reasonable and accurate forecast of the depositional rate after reclamations in muddy coast is a challenge of the engineering sediment search.Based on the suspended fine-sediment deposition prediction model after reclamation proposed in the literature,the influence of wave actions on siltation after topographic changing works is focused on.Two-dimensional horizontal large-scale tidal current and suspended sediment transport model and wave model are set up,with which,siltation intensity in work area under different waves is calculated.The relationship of coefficient k0,by which waves influence on siltation is characterized,between relative wave height is established.The siltation intensity calculated by the formula proposed in the literature,whose coefficient k0 is obtained by the relationship above according to actual waves in engineering waters,well agree with the actual amount.