【摘要】 建立波浪在淤泥质底床上传播的理论模型并对其进行求解,讨论了淤泥质河口海岸中淤泥与波浪的相互作用规律,包括波浪作用下的淤泥输移规律以及波浪在淤泥质床面上传播过程中的衰减现象.根据计算得出不同底床密度下,水层和泥层的流速和压强分布,分析波浪衰减的影响因素,针对3种不同的淤泥流变模型(黏性流体模型、幂律流体模型和黏弹性介质模型),分别计算相应的波浪衰减值,并与实验值进行对比.结果显示,选用的淤泥的流变模型不同,泥床对波浪的衰减值也不同.影响波浪衰减的因素主要有泥厚、波浪周期以及水深.泥厚和波浪周期均存在临界值,使波浪衰减达到最大;衰减率随水深的增大而单调减小.通过与实测值比较得出幂律流体模型更能描述淤泥的真实情况.更多还原

【Abstract】 The theoretical model for wave propagation over muddy bottom was set up and solved,and the interaction between mud and wave—including mud transport and wave attenuation,was discussed.The velocity and pressure distribution of water and mud layers in different mud densities were calculated and analyzed,and the wave attenuation values in three different rheological models(viscous,power-law and viscoelastic models) were respectively calculated and compared with experimental data to analyze the affecting factors(mud thickness,wave period and water depth) of wave attenuation.The results show that the critical values of wave period and mud thickness exist,which can make wave attenuation the maximum.The wave attenuation rate decreases with increasing water depth.According to ex-perimental results,the power-law fluid model is more suitable to describe the muddy bed.更多还原