Longitudinal dispersion in wave-current-vegetation flow

• Дата: 2009
• Автори: Sandeep Patil, Xian gui Li, Chi wai Li, Barry Y. F. Tam, Cynthia Y. Song, Yong P. Chen, Qing he Zhang
• Формат: Стаття
• Мова: English
• Опубліковано: Морський гідрофізичний інститут НАН України 2009
• Назва видання: Морской гидрофизический журнал
• Теми: Экспериментальные и экспедиционные исследования
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/105049
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Longitudinal dispersion in wave-current-vegetation flow / Sandeep Patil, Xian gui Li, Chi wai Li, Barry Y. F. Tam, Cynthia Y. Song, Yong P. Chen, Qing he Zhang // Морской гидрофизический журнал. — 2009. — № 1. — С. 50-67. — Бібліогр.: 38 назв. — англ.

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-currentvegetation interaction shows strong interfacial shear with increase in velocity due to wave-induced drift. The increase in turbulence in vegetation region is found to be about twice than in no wave case due to the additional mixing by wave motions. Solute experiments are conducted to quantify wavecurrent-vegetation longitudinal dispersion coefficient (WCVLDC) by routing method and by defining length and velocity scales for wave-current-vegetation flow, an empirical expression for WCVLDC has been proposed. Although increase in vertical diffusivity is observed compare to bare-bed channel, the shear effect is stronger which increases the magnitude of WCVLDC. The study can be a guideline to understand the combine hydrodynamics of wave, current and vegetation and to quantify the longitudinal dispersion therein.