Design of Trapezoidal Expansive Transitions
Publication: Journal of Irrigation and Drainage Engineering
Volume 118, Issue 1
Abstract
Open‐channel expansions for subcritical flows are encountered in the design of hydraulic structures such as aqueducts, superpassages, and so on. In these structures the flow tends to separate while subjected to the positive pressure gradient associated with flow deceleration, thus resulting in a considerable loss of energy. Considerable savings could be achieved if the transition is designed by minimizing the head loss incurred in it. In this paper which applies the optimal‐control theory, a methodology for the design of an expansive transition between a rectangular flume and a trapezoidal channel for a subcritical flow was evolved. Analyzing a large number of designed optimal transitions, empirical equations for the bed‐width and side‐slope profiles were obtained.
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Copyright © 1992 ASCE.
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Published online: Jan 1, 1992
Published in print: Jan 1992
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