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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。
Affected by the action of wave lifting, the reasonable prediction of siltation effect in the estuarine beach project has always been one of the problems in engineering sediment research. Based on the siltation prediction model proposed by [1] in silt estuarine beach after silting, the effect of wave action on the siltation-promoting effect of the project was studied. By establishing the mathematical model of two-dimensional water and sediment and the wave model in the Yangtze Estuary-Hangzhou Bay, the sediment intensity of the silting-sediment project under different wave fields was calculated. By this, the influence coefficient of sedimentation k0 caused by wave action is defined and the relation between coefficient k0 and relative wave height (wave height water depth) is established. Therefore, combined with the numerical simulation results of the classified wave in the silting-retaining area, the statistical average k0, which comprehensively reflects the influence of all the waveforms in the silting-up area within a year, is given and k0 is substituted into the silt estuary proposed in [1] The results show that the calculated value of siltation intensity in the silting area agrees well with the measured value.