Velocity profiles are measured in a series of hydrographs over gravel beds. The following results are obtained: the velocity profiles follow the log law for most of the hydrographs investigated; the velocity profiles observing the log law are analyzed in light of the Br value and the II value. The Br value in unsteady flow depends on both the unsteadiness and the relative roughness and a loop exists between the Br value and the Froude Number. The relative water depth, where the local velocity is approximately equal to the vertically averaged velocity, cannot be assumed as a constant of 0.4 during the hydrographs investigated.
In its Activities Report of the Laboratory for Hydraulic Research 14 p (SEE N91-20432 12-34
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- Flow Characteristics;
- Unsteady Flow;
- Velocity Distribution;
- Fluid Dynamics;
- Fluid Mechanics and Heat Transfer