Author(s): D. G. Meijer; E. H. Van Velzen
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Abstract: In 1996, a new analytical model of the vertical flow velocity profile and the hydraulic roughness of submerged vegetation was developed (Klopstra et al, 1997). The model is physically based with only one empirical parameter. Different shear-stress descriptions are applied for the vegetation layer and the surface layer. Calculated flow profiles and roughness values correspond well with results from scale model studies reported in literature. This paper discusses new flume experiments on prototype scale, conducted in 1997 and 1998. These confirm the applicability of the analytical model for field conditions. The tests were done by using vertical steel bars and natural reed. The prediction of the empirical parameter has been improved on the basis of the experiments. The results imply a considerable improvement of roughness predictions of submerged vegetation, compared to traditional methods. The new method will be applied for nature rehabilitation projects, to be implemented in river floodplains in the Netherlands.
Year: 1999