Investigation of turbulence characteristics in channel with dense vegetation |
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| Institution: | Hossein AFZ ALIMEHR,Razieh MOGHBEL,Jacques GALLICHAND,and Jueyi SUI 1 Assoc.Prof.,2 Graduate student,Water Engineering Department,Isfahan University of Technology,Iran 84156 3 Prof.,Departement des sols et de genie agroalimentaire,Universite Laval,St-Foy,QC,Canada 4 Assoc.Prof.,Environmental Engineering Program,University of Northern British Columbia,Prince George,BC, Canada,V2N 4V9, |
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| Abstract: | In this experimental study,the turbulent flow in a channel with vegetation by using sprouts of wheat on channel bed was investigated.Two different aspect ratios of channel were used.An Acoustic Doppler Velocimetry was used to measure parameters of turbulent flow over submerged sprouts of wheat,such as velocity profiles.The log law and the Reynolds shear stress distribution were applied. Results indicate that the position of the maximum turbulence intensity superposes on the inflection point situated over the top of submerged vegetation cover.Quadrant analysis shows that near the vegetation bed,the sweeps and ejections appear to be the most dominant phenomenon,while far from the vegetated bed,the outward is dominant event.Results also show that the aspect ratio plays an important role on the contribution of the different bursting events for Reynolds stress determination. |
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| Keywords: | Bed vegetation Aspect ratio Reynolds stress Quadrant analysis |
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