Impact of Wind on Storm-Water Pond Hydraulics
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 10
Abstract
A storm water pond’s effectiveness to treat particulate bound pollutants in urban runoff depends on its hydraulic behavior. Departures from the ideal plug flow, such as short-circuiting and mixing, pose hindrances to pond design. The goal of this study was to assess the importance of wind on storm water pond hydraulics. High resolution acoustic velocity measurements were conducted in a 0.3 ha, 2 m deep pond during dry weather. Results suggest that winds drive a turbulent, three-dimensional flow regime, including a lateral circulation and vertical exchange flows. A fully developed surface layer representing of the water depth, with drift scaling as 0.004 on wind speed at 10 m above ground, was observed in the downwind section of the pond. Wind-induced vertical mixing, short-circuiting, and basin scale mixing were estimated to occur faster than the typical nominal residence time in storm water ponds. Wind is therefore an important hydraulic driver in small water systems, which may potentially reduce their treatment performance. Local landscaping may be used as a wind mitigation measure.
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Acknowledgments
This work was funded by the University of Iceland Research Fund. The local public utility Orkuveita Reykjavíkur and the Icelandic Meteorological Office are thanked for access to meteorological and hydrological data. Lilja Oddsdóttir receives thanks for her help in field data collection. Professors Magnus Larsson and Lars Bengtson at Lund University Water Resources Engineering Division are thanked for their input in the manuscript.
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Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 29, 2015
Accepted: Jan 26, 2016
Published online: May 23, 2016
Published in print: Oct 1, 2016
Discussion open until: Oct 23, 2016
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