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.
| Original language | English |
|---|---|
| Pages (from-to) | 45-61 |
| Number of pages | 17 |
| Journal | Physical Oceanography |
| Volume | 19 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 20 Jul 2009 |
ASJC Scopus subject areas
- Oceanography
- Water Science and Technology
- Ocean Engineering
- Fluid Flow and Transfer Processes