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Unformatted text preview: scussed in Sec. 10.2, is the formula of choice in openchannel
hydraulics. Flow Classification
by Depth Variation The most common method of classifying openchannel flows is by the rate of change
of the freesurface depth. The simplest and most widely analyzed case is uniform flow,
where the depth (hence the velocity in steady flow) remains constant. Uniformflow
conditions are approximated by long straight runs of constantslope and constantarea
channel. A channel in uniform flow is said to be moving at its normal depth yn, which
is an important design parameter.
If the channel slope or cross section changes or there is an obstruction in the flow,
then the depth changes and the flow is said to be varied. The flow is gradually varying if the onedimensional approximation is valid and rapidly varying if not. Some examples of this method of classification are shown in Fig. 10.3. The classes can be summarized as follows:
1. Uniform flow (constant depth and slope)
2. Varied flow
a. Gradually varied (onedimensional)
b....
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.
 Spring '08
 Sakar

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