Author(s): Vittorio Pasquino, Paola Gualtieri
Linked Author(s): Paola Gualtieri
Keywords: Rigid vegetation, two-layer approach, flow resistance, density, submergence
Abstract: Vegetation behavior in riparian environment represent an important research topic in hydraulics and ecohydraulics. Therefore, one of the most important research challenges is to deepen interactions between flow and vegetation, in order to better understand its effects on flow resistance and turbulent characteristics of the flow. In vegetated flow models, the flow regime is often separated in two layers: vegetated layer and surface layer. Flow resistance models, based on two-layer approach, are often tested with experimental data relative to vegetation density and submergence ratio (i. e. , the ratio between h=flow depth and hv=vegetation height, h/hv) varying in wide ranges. The aim of the paper is to deepen how variability of submergence ratio and the non-dimensional vegetation density can affect the reliability of the flow resistance models. In particular, in this paper, the results of the statistical test applied to the most cited and used literature models for evaluating the flow resistance of rigid vegetation, are shown. The test have been carried out with experimental data from literature, by the mean of different statistical parameters, considering the different ranges of vegetation density and submergence ratio. The results shows that vegetation density and submergence ratio can affect the reliability of the model
Year: 2017