Friction coefficient for roughness caused by vegetation

For hydraulic quantification the vegetation of the banks and floodplains has to be classified. It is differentiated between small, middle and high vegetation. If the vegetation height is substantially smaller than the flow depth, the velocity distribution will turns out to be a boundary layer flow. The flow is blocked by middle and high vegetation along the entire flow depth. This loss caused by collision increases over the flow depth. Under these conditions there is no logarithmic velocity distribution, moreover the flow velocity is constant along the flow depth.For this reason small, middle and high vegetation must be described with different approaches. According to their hydraulic effect a difference is made between flooded (submerged), in-flow (immersed) and isolated vegetation.

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Hydrodynamics of Floods






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