Numerical Investigation of Wave–Current–Vegetation Interaction
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 7
Abstract
A fully three-dimensional numerical model has been developed to simulate the wave–current–vegetation interaction phenomenon. Physical experiments have also been carried out to provide data for the verification of the model. The numerical model utilizes the split-operator approach, in which the advection, diffusion, and pressure propagation are solved separately. Vegetation is modeled as a sink of momentum. The unsteady fluid force on vegetation is split into a time-dependent inertia component and a drag component. The model has been applied to simulate vegetation under pure waves, pure current, as well as wave current. Compared to available experimental data, the model is capable of reproducing the turbulence and velocity profiles induced by vegetation–current interaction. The wave attenuation due to vegetation is simulated correctly with a proper value of drag coefficient. Both the physical experiments and numerical simulations show that the interaction of waves and current leads to a greater attenuation of waves in the presence of vegetation, which can be explained by the nonlinear nature of the resistance force induced by the vegetation.
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Acknowledgments
This work was supported by a grant from the Research Grant Council of the Hong Kong Special Administrative Region (Project No. UNSPECIFIED5169/04E) and a grant from the Hong Kong Polytechnic University (Project No. UNSPECIFIEDG-T649).
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Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 7 • July 2007
Pages: 794 - 803
Copyright
© 2007 ASCE.
History
Received: Sep 19, 2005
Accepted: Dec 20, 2006
Published online: Jul 1, 2007
Published in print: Jul 2007
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