Experimental Study of Bed Load Transport through Emergent Vegetation |
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| Authors: | Angelina A. Jordanova C. S. James |
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| Affiliation: | 1Research Officer, Centre for Water in the Environment, School of Civil and Environmental Engineering, Univ. of the Witwatersrand, Private Bag 3, Wits 2050, South Africa.
2Associate Professor, Centre for Water in the Environment, School of Civil and Environmental Engineering, Univ. of the Witwatersrand, Private Bag 3, Wits 2050, South Africa.
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| Abstract: | Vegetation is an important agent in fluvial geomorphology and sedimentary processes, through its influence on the local hydraulics that determine sediment transport. Within stands of emergent vegetation, bed shear is substantially reduced through the absorption of momentum by drag on the stems. This stimulates deposition of sediment and reduces capacity for bed load transport. The effect of emergent vegetation on hydraulic parameters (including equilibrium bed gradient, flow depth, and velocity) and on bed load transport rate has been investigated experimentally for one sediment size, stem diameter, and stem spacing. Bed load transport rate was found to be closely related to bed-shear stress, which must be estimated by partitioning total flow resistance between stem drag and bed shear. |
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| Keywords: | Vegetation Sediment transport Bed load Experimentation |
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