Coastal vegetation plays an important role in wave energy dissipation.Vegetation wave dissipation is an important form of coastal ecological protection.Based on the hydrodynamic characteristics of the nearshore area north of Longxue Island,Nansha District,Guangzhou City,this study investigates the wave dissipation effects of single-type vegetation(flexible,rigid)and composite vegetation(rigid-flexible combination)under different submergence degrees,incident wave heights,and width ratios of flexible vegetation through physical model experiments in a wave flume.The results show that when the submergence degree α=0.67(lower than the submergence degree at the crown center,which is 0.03,indicating that the water depth is slightly below the crown)or α>1.00(water depth higher than the top of the crown),the wave dissipation effect of single-type rigid vegetation is optimal.When the submergence degree α increases to 0.78 and 0.83(respectively,0.08 and 0.13 higher than the submergence degree at the crown center),the wave dissipation effect of flexible and rigid composite vegetation is better.With the increase of wave height,both single-type vegetation and composite vegetation show enhanced wave dissipation effects.The ratio of the width of flexible vegetation B/B0 affects the vegetation wave dissipation coefficient K,which is related to the submergence degree and wave height.When α<1.00,K increases first and then decreases with the increase of B/B0;when α=1.00,K decreases first and then increases,then decrease again with the increase of B/B0,and K reaches its maximum when B/B0=0;when α>1.00,K shows a decreasing trend with the increase of B/B0.This study provides theoretical support for the construction of local vegetation ecological shoreline protection projects.
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