【作者】 齐鹏； 侯一筠；

【Author】 Qi Peng Hou Yi-jun (Institute of Oceanology. The Chinese Academy of Sciences,Qingdao 266071,China)

【机构】 中国科学院海洋研究所；

【摘要】 将一个经验的粘-弹-塑性体流变模型应用于水-泥两层耦合数学模型,数值研究了表面水波在淤泥质底床上传播时的衰减特性。为提高水-泥层界面附近流动的分辨力,特别是波浪边界层的特性,采用了对数网格的数值处理技巧。模型结果经与已往实验数据验证后,考虑不同密度泥床情形,数值研究重点探讨了表面水波衰减变化与底泥密度、波浪周期、泥床厚度和其Stokes’边界层厚度的比值及与泥层振荡位相滞后之间的关系。更多还原

【Abstract】 A two-layer coupled model for numerical study of water waves interaction with their underlying soft mud beds is presented. In this water-mud system, an empirical rheological model is used that reflects the combined visco-elasto-plastic properties of soft mud under such oscillatory external forces as water waves; in addition, a logarithmic grid in the vertical direction is employed, which increases resolution of the flow in the neighborhood of both sides of the interface, thus contributes to reproducing the characteristics of wave boundary. There is a good agreement between numerical results of wave attenuation over muddy bottoms by the numerical model and the laboratory data concerned. Further study is conducted on the decay rate versus the surface wave period, the ratio of the thickness of mud layer and the Stokes’ boundary layer, and the phase difference, respectively.更多还原