Fundamentals of Engineering Design
STABLE CHANNEL CURVE
Width
Figure 5.43 Example of a Stable Channel Curve
5.3.7
GRAVEL BED RIVERS
A method for stable channel design of alluvial sand bed rivers has been reviewed in Section 5.3.6.5.
The method is included in the Hydraulic Design Package for Channels (SAM). A similar method that
applies to gravel bed rivers is proposed by Firenzi (1998). Governing equations of flow resistance and
sediment transport used by the method are reviewed. The formulation of the method into a computer
model titled Gravel Bed Rivers (GBR) is then discussed.
5.3.7.1 Governing Equations for Stable Channel Design Procedure
Three relationships between channel geometry and flow resistance have been developed and used
extensively. The resistance parameters have been termed the Darcy-Weisbach friction factor, f, the Chezy
coefficient, C, and the Manning coefficient, n. The steady flow relationships associated with these
resistance coefficients are given below:
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