Mass transport in a thin layer of power-law mud under surface waves

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• 作者：Jie Liu ; Yuchuan Bai ; Dong Xu
• 关键词：Power ; law model ; Flow field ; Mass transport velocity ; Periodic pressure load
• 刊名：Ocean Dynamics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：67
• 期：2
• 页码：237-251
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Oceanography; Geophysics/Geodesy; Atmospheric Sciences; Fluid- and Aerodynamics; Monitoring/Environmental Analysis;
• 出版者：Springer Berlin Heidelberg
• ISSN：1616-7228
• 卷排序：67

文摘

The mass transport velocity in a two-layer system is studied theoretically. The wave motion is driven by a periodic pressure load on the free water surface, and mud in the lower layer is described by a power-law rheological model. Perturbation analysis is performed to the second order to find the mean Eulerian velocity. A numerical iteration method is employed to solve the non-linear governing equation at the leading order. The influence of rheological properties on fluid motion characteristics including the flow field, the surface displacement, the mass transport velocity, and the net discharge rates are investigated based on theoretical results. Theoretical analysis shows that under the action of interfacial shearing, a recirculation structure may appear near the interface in the upper water layer. A higher mass transport velocity at the interface does not necessarily mean a higher discharge rate for a pseudo-plastic fluid mud.