Dynamic Model for Subcritical Combining Flows in Channel Junctions
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 9
Abstract
A one-dimensional theoretical model for subcritical flows in combining open channel junctions is developed. Typical examples of these junctions are encountered in urban water treatment plants, irrigation and drainage canals, and natural river systems. The model is based on applying the momentum principle in the streamwise direction to two control volumes in the junction together with overall mass conservation. Given the inflow discharges and the downstream depth, the proposed model solves for each of the upstream depths. The interfacial shear force between the two control volumes, the boundary friction force, and the separation zone shear force downstream of the lateral channel entrance are included. Predictions based on the proposed approach are shown to compare favorably with existing experimental data, previous theories, and conventional junction modeling approaches. The main advantages of the proposed model are that the proposed model does not assume equal upstream depths and that the dynamic treatment of the junction flow is consistent with that of the channel reaches in a network model.
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Information
Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 9 • September 2002
Pages: 821 - 828
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Dec 28, 1998
Accepted: Feb 5, 2002
Published online: Aug 15, 2002
Published in print: Sep 2002
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