Physical Oceanography

, Volume 19, Issue 1, pp 45–61

Longitudinal dispersion in wave-current-vegetation flow

  • S. Patil
  • X. Li
  • C. Li
  • B. Y. F. Tam
  • C. Y. Song
  • Y. P. Chen
  • Q. Zhang
Experimental and Field Research

DOI: 10.1007/s11110-009-9036-8

Cite this article as:
Patil, S., Li, X., Li, C. et al. Phys Oceanogr (2009) 19: 45. doi:10.1007/s11110-009-9036-8

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.

Copyright information

© Springer Science+Business Media, Inc. 2009

Authors and Affiliations

  • S. Patil
    • 1
  • X. Li
    • 2
  • C. Li
    • 1
  • B. Y. F. Tam
    • 1
  • C. Y. Song
    • 1
  • Y. P. Chen
    • 1
  • Q. Zhang
    • 3
  1. 1.Hong Kong Polytechnic UniversityKowloonHong Kong
  2. 2.Beijing IS & T UniversityBeijingChina
  3. 3.Tianjin UniversityTianjinChina