Longitudinal dispersion in wave-current-vegetation flow

The flow, turbulence, and longitudinal dispersion in wave-current flow through submerged vegetation are experimentally examined. Laboratory experiments are carried out by superimposing progressive waves on a steady flow through simulated submerged vegetation. The resultant wave-current-vegetation in...

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Bibliographic Details
Published in:Physical oceanography 2009, Vol.19 (1), p.45-61
Main Authors: Patil, S., Li, X., Li, C., Tam, B. Y. F., Song, C. Y., Chen, Y. P., Zhang, Q.
Format: Article
Language:English
Subjects:
Atmospheric Sciences
Climate Change
Earth and Environmental Science
Earth Sciences
Environmental Physics
Experimental and Field Research
Hydrodynamics
Ocean currents
Oceanography
Physical oceanography
Remote Sensing/Photogrammetry
Steady flow
Submerged plants
Turbulence
Vegetation
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Summary:The flow, turbulence, and longitudinal dispersion in wave-current flow through submerged vegetation are experimentally examined. Laboratory experiments are carried out by superimposing progressive waves on a steady flow through simulated submerged vegetation. The resultant wave-current-vegetation interaction shows strong interface shear with increase in the velocity due to the wave-induced drift. The increase in turbulence in the region of vegetation is found to be about twice higher than in the no-wave case due to the additional mixing by wave motions. Solute experiments are conducted to quantify the wave-current-vegetation longitudinal dispersion coefficient (WCVLDC) by the routing method and by defining length and velocity scales for the wave-current-vegetation flow. An empirical expression for the WCVLDC is proposed. Although the increase in vertical diffusivity is observed as compared with bare-bed channels, the shear effect is stronger, which increases the value of the WCVLDC. The study can be a guideline to understand the combined hydrodynamics of waves, current, and vegetation and quantify the longitudinal dispersion therein.
ISSN:0928-5105
1573-160X
0928-5105
DOI:10.1007/s11110-009-9036-8