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標題: Transient deformation of a poroelastic channel bed
作者: Hsieh, P.C.
Shih, W.P.
Huang, L.H.
關鍵字: transient deformation;soft poroelastic bed;boundary layer correction;concept;boundary-fitted co-ordinate transformation;dynamic-response;sand ripples;water-waves;layer;flow
Project: International Journal for Numerical and Analytical Methods in Geomechanics
期刊/報告no:: International Journal for Numerical and Analytical Methods in Geomechanics, Volume 26, Issue 13, Page(s) 1279-1298.
The coupled transient response of a poroelastic bed form due to stream flow and non-linear water waves is investigated numerically. The theory of potential flow is applied to channel flow while Biot's theory of poroelasticity (J. Appl. Phys. 1962; 33(4):1482) is adopted to deal with the deformable porous bed. A boundary-fitted co-ordinate system is used to calculate the variation in the bed form. The result of a simple periodic wave form over a soft poroelastic bed agrees well with the analytical solution of Hsieh el al. (J. Eng. Mech., ASCE 2000; 126(10):1064). However, due to the rapidly damping second dilatational wave inside the soft poroelastic bed, the solution for transient bed form near the interface is not easy to compute accurately. In order to overcome this difficulty, a simplified numerical model based on the boundary layer correction concept proposed by Hsieh et al. (2000) is established, which neglects Darcy's terms. The transient deformation of an irregular poroelastic bed that includes a trench and a downward step at the channel bed is simulated successfully. Copyright (C) 2002 John Wiley Sons, Ltd.
ISSN: 0363-9061
DOI: 10.1002/nag.244
Appears in Collections:水土保持學系

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