往复流作用下的粗颗粒推移质的输沙规律

Law of Coarse Bed-load Sediments Transport in Oscillatory Flows

推移质是海岸带泥沙输运的重要组成部分,粗颗粒推移质在波浪、潮汐等往复流作用下的运动规律是海岸工程建设的重要依据。从理论分析和试验研究两个方面分别对往复流作用下的粗颗粒推移质输沙规律进行了研究,提出了一个瞬时推移质输沙率的计算模型,并将试验结果与该模型的计算结果进行了对比验证,发现该计算模型对线性往复流作用下的推移质泥沙的运动趋势模拟良好,但对于其相位滞后效应考虑不足,其误差来源在于对附加质量力的忽略。

The moving particles in coastal region mainly consist of bed-load with coarse sediments. The law of bed-load sediments transport in oscillatory flow of wave and tide is an important basis for the construction of coastal engineering. In this paper, the law of bed-load sediments transport in oscillatory flow was evaluated from both theoretical analysis and experimental studies, and an analytical model was deduced to predict the instantaneous bed-load transport rate in oscillatory flow. Comparing the calculating results with the experimental ones, it can be found that the analytical model has a good simulation of the variation of the bed-load sediments transport rate in the linear oscillatory flow, however, this model fails to take the phase lag effect into consideration. According to the procedure of model, the phase lag lies in the neglect of the additional mass force.