Gradual Development of Bores in Canal Systems

by Theodor Strelkoff, US Water Conservation Lab, Phoenix, United States,

Document Type: Proceeding Paper

Part of: Irrigation and Drainage: Saving a Threatened Resource—In Search of Solutions


Modern computer programs for modeling unsteady flow in open channels are typically constructed using a momentum conserving form of the Saint Venant equations. This allows computation of flows that develop small to moderate-sized bores without special treatment of the discontinuity. On the other hand, many earlier models still in use are based on the conventional forms of the Saint Venant equations, and these, while generally accurate and reliable, generate unpredictable results in the presence of bores. The present study quantifies conditions under which bores will form as the result of gradually increasing discharge at the head end of a canal reach.

Subject Headings: Canals | Open channel flow | Model accuracy | Fluid flow | Computer models | Discontinuities | Unsteady flow | Computer software

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