Effects of vegetation on Manning’s roughness coefficient in natural streams: a case-study in Attica, Greece.

Abstract: Ecohydraulic research has recently focused on the effects of streambed and riparian vegetation on the hydraulic properties of river reaches due to the ecological importance of vegetation, since vegetation patches can be used in riverine ecological restoration and flood management strategies. In this study, we measured hydraulic data (flow velocity and water depth) in 98 riverine microhabitats, explored the effect of vegetation on bed roughness and determined the Manning’s roughness coefficients for flexible and rigid vegetation in two natural streams of Attica, Greece. The presence of vegetation increased the Manning’s roughness coefficients of unvegetated substrates by 44% to 57%. Our results can be used for the proper calibration of hydraulic models in vegetated streams, providing more robust support to relevant restoration or flood management strategies.     «

Abstract: Ecohydraulic research has recently focused on the effects of streambed and riparian vegetation on the hydraulic properties of river reaches due to the ecological importance of vegetation, since vegetation patches can be used in riverine ecological restoration and flood management strategies. In this study, we measured hydraulic data (flow velocity and water depth) in 98 riverine microhabitats, explored the effect of vegetation on bed roughness and determined the Manning’s roughness co...     »