Effect of vegetation on run-up and wall pressures due to cnoidal waves

Abstract

A comprehensive experimental investigation was carried out to understand the effect of vegetation in attenuating run-up over a plane slope of 1 : 30 due to the propagation of cnoidal waves. Two different types of vegetation configurations, namely tandem and staggered, are considered. Dynamic pressures exerted along a vertical wall fronted by these two vegetation types were measured, and the typical variation of dimensionless peak pressures for different relative depths of submergence of the pressure ports is reported as a function of dimensionless parameters involving the vegetation and wave characteristics. Further, typical results on the variation of the dimensionless peak run-up versus the surf similarity parameter only for the staggered configuration are also herein reported. Finally, the percentage reduction in wave run-up and pressures on the wall due to the presence of wall fronted by vegetation are reported.

Analysing turbulence characteristics of flow over submerged flexible vegetated channel

“…flow resistance in mobile bed, rough immobile beds and clear water flows (Best et al 1997;Song et al 1998;Calomino et al 2004), quantification of near-bed turbulence parameters (Dey et al 2012), changes in flow velocity distribution and turbulence characteristics in connection with the specific roughness of flexible submerged macrophytes (Stephan and Gutknecht 2002), effect of two forms of flexible vegetation on the turbulence structure within the submerged canopy and in the surface flow region (Wilson et al 2003), mean velocity profiles and turbulence characteristics above flexible wheat (Jarvela 2005) and turbulence structures and coherent motion in vegetated canopy (Nezu and Sanjou 2008). Sundar et al (2011) have examined the effect of vegetation on run-up and wall pressures due to cnoidal waves. Noarayanan et al (2013) have studied experimentally to examine the resistance characteristics of a group of model slender flexible cylinders, arranged in staggered pattern.…”

Effect of Emerged Coastal Vegetation on Wave Attenuation Using Open Source CFD Tool: REEF3D

“…In India, the soft measures of coastal protection have gained im-portance after tsunami. Some of the early works include experimental investigations on the effect of vegetation on reducing the wave run-up [17] and experimental investi-gation of wave attenuation through an artificial vegetation meadow [1].…”