Transcription of gradually-varied flow (GVF)
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gradually-varied flow (GVF)
Prof. Dr. At l BULU 1 Chapter 6 gradually-varied Flow in Open Channels Introduction A steady non-uniform flow in a prismatic channel with gradual changes in its water-surface elevation is named as gradually-varied flow (GVF). The backwater produced by a dam or weir across a river and drawdown produced at a sudden drop in a channel are few typical examples of GVF. In a GVF, the velocity varies along the channel and consequently the bed slope, water surface slope, and energy line slope will all differ from each other. Regions of high curvature are excluded in the analysis of this flow.
The water surface meets a very large depth as a horizontal asymptote. b) y → y0, V → V0, Se → S0 0 1 lim 2 0 0 0 = − − = → r y y F S S dx dy The water surface approaches the normal depth asymptotically. The most common of all GVF profiles is the M1 type, which is …
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