ABSTRACT The formulation of methods that are both simplified and sufficiently accurate for estimating flow resistance in vegetated channels constitutes a critical challenge in the context of flood hazard mitigation and management of riparian species that directly influence channel conveyance capacity, channel morphological evolution and sediment deposition. In this study, measurements collected by the US Army Corps of Engineers in a large‐scale channel with unmanaged spontaneous vegetation were used to verify the suitability of a theoretical flow resistance equation in open‐channel conditions and floodplains. This equation, deduced by applying dimensional analysis and the incomplete self‐similarity condition for the velocity profile of open‐channel flow, was initially reported. The available meausurements, referring to different vegetation density values, were used for relating the Γ function of the power velocity profile to the slope energy, the flow Froude number and vegetation density. This investigation showed that the Darcy–Weisbach friction factor f can be accurately estimated using the proposed theoretical flow resistance equation, with errors in the f estimate that are less than or equal to 15% for 92.2% of the investigated cases and less than or equal to 10% for 75.5% of the cases. The findings of this study also demonstrated that the characteristics of the investigated vegetation, such as vegetation density, appreciably affect the estimate of flow resistance.
Palmeri et al. (Wed,) studied this question.
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