Author(s): F. Hendriksen; K. S. Davar
Linked Author(s):
Keywords: No Keywords
Abstract: The velocity profiles measured at the two end cross-sections of the reach were used to determine the average and maximum velocities, flow depth, and the location of maximum velocity at each station in the cross-section. From the data, cross-sectional values of velocity, area of flow, and hydraulic radius were estimated. The reach value of the water surface slope was used as an approximation of the slope of the energy line S. Reach values of the friction factor f and Manning’s n were thus evaluated. Velocity profiles were analysed by the binary velocity distribution method proposed by Vedula and Achanta (1985). Results of this analysis have indicated that measured velocity profiles can be used to evaluate composite resistance coefficients of ice-covered natural channels where use of the Prandtl-Von Karman velocity distribution would lead to unrealistic results. Application of the method is subject to some limitations given in the paper. Application of this procedure is considered more reliable than reach values based on measured water surface slopes which are difficult to measure and can lead to inconsistent results.
Year: 1986