Hydraulic Characteristics of Gabion-Stepped Weirs
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Volume 134, Issue 8
Abstract
Experimental studies on the hydraulics of flow through and over gabion-stepped weirs are presented. Two flow components were observed, i.e., base flow through the void between filled stones and overflow on the gabions. The energy loss ratios in the gabion-stepped weirs are greater than those in the corresponding horizontal stepped weirs by approximately 7, 10, and 14% for weir slopes of 30, 45, and , respectively. As a result, the velocity at the outlet is lower. Stone size and shape have little influence on the energy loss and flow velocity as compared to the increasing effect of the weir slope. The pressure acting on the step face for the gabion-stepped weirs is less than that of the horizontal steps owing to the cushioning effect generated by filled stones. To reduce pressure on a step face at a fixed discharge for different weir slopes, the void ratio of the filled stones should be low to allow a small amount of base flow. The pressure distribution pattern on the horizontal face of a step is provided.
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Acknowledgments
The writers would like to thank the Commission on Higher Education (CHE), and the Thailand Research Fund (TRF) under Grant No. UNSPECIFIEDRMU4880003 for providing financial support for this study.
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Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 8 • August 2008
Pages: 1147 - 1152
Copyright
© 2008 American Society of Civil Engineers.
History
Received: Jan 18, 2006
Accepted: Nov 27, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
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