Experimental Investigation of Surges in a Stormwater Storage Tunnel
Publication: Journal of Hydraulic Engineering
Volume 131, Issue 10
Abstract
Below-grade storage tunnels in stormwater systems are usually designed to operate in a free-surface flow regime. However, intense rain events may trigger flow regime transition to pressurized flow, which results in operational problems. To date, little guidance is available as to the considerations necessary to properly design a system undergoing flow regime transition. In this investigation, an experimental apparatus consisting of a -long, -diameter acrylic pipe was used to observe the nature of flows in such conditions. It was noticed that the air near the pipe crown may pressurize and influence the flow dynamics. Qualitative observations regarding the interactions between the air and water phases during the filling events are included in this study. Generally the surge intensity was maximized when a hydraulic bore propagating towards the surge riser just filled the pipe cross section, and it increased with the pressure head behind the pressurization front. Furthermore, the results indicate that the effects of air phase pressurization should be properly included in numerical simulations if ventilation conditions are limited.
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Acknowledgment
The writers would like to acknowledge the support of the CNPq, a Brazilian Government entity committed to the development of science and technology, which has provided a fellowship to support the PhD studies of the first writer.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 10 • October 2005
Pages: 853 - 861
Copyright
© 2005 ASCE.
History
Received: Oct 27, 2003
Accepted: Dec 20, 2004
Published online: Oct 1, 2005
Published in print: Oct 2005
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