The impacts of aquatic vegetation on bed load transport rate and bedform characteristics were quantified using flume measurements with model emergent vegetation. First, a model for predicting the turbulent kinetic energy,
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Abstract k t , in vegetated channels from channel average velocityU and vegetation volume fractionϕ was validated for mobile sediment beds. Second, using data from several studies, the predictedk t was shown to be a good predictor of bed load transport rate,Q s , allowingQ s to be predicted fromU andϕ for vegetated channels. The control ofQ s byk t was explained by statistics of individual grain motion recorded by a camera, which showed that the number of sediment grains in motion per bed area was correlated withk t . Third, ripples were observed and characterized in channels with and without model vegetation. For low vegetation solid volume fraction (ϕ ≤ 0.012), the ripple wavelength was constrained by stem spacing. However, at higher vegetation solid volume fraction (ϕ =0.025), distinct ripples were not observed, suggesting a transition to sheet flow, which is sediment transport over a plane bed without the formation of bedforms. The fraction of the bed load flux carried by migrating ripples decreased with increasingϕ , again suggesting that vegetation facilitated the formation of sheet flow. -
Luhar, M. ; Infantes, E. ; Nepf, H. ( , Journal of Geophysical Research: Oceans)
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Yang, J. Q. ; Nepf, H. M. ( , Geophysical Research Letters)
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Yang, J. Q. ; Chung, H. ; Nepf, H. M. ( , Geophysical Research Letters)