Variation of Flow Resistance Through Curved Channels

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Abstract
An analysis is provided for the spatial variations of flow resistance and other flow characteristics through curved channels reflecting the effects of transverse circulation. Among the assumptions in the analysis, the transverse velocity profile is assumed to remain similar during circulation growth and decay. A mathematical model for computing such variations is developed and it has been verified using limited available data. The results demonstrate that flow resistance or energy expenditure produced by transverse flow can be very significant even for mild curves without flow separation. Because of the important effects of channel curvature, analytical methods developed in this model provide useful techniques for studies of river morphology and sediment transport in meandering streams.

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