Longitudinal dispersion in wave-current-vegetation flow |
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Authors: | S Patil X Li C Li B Y F Tam C Y Song Y P Chen Q Zhang |
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Institution: | (1) Hong Kong Polytechnic University, Kowloon, Hong Kong;(2) Beijing IS & T University, Beijing, China;(3) Tianjin University, Tianjin, China |
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Abstract: | 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.
Published in Morskoi Gidrofizicheskii Zhurnal, No. 1, pp. 50–67, January–February, 2009. |
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