Influence of Small Water Surface Perturbations on the Reaeration Process
Publication: Journal of Environmental Engineering
Volume 140, Issue 3
Abstract
This paper aims to develop a general reaeration model for water bodies subject to small surface perturbation, such as ripples that may be induced by wind, waves, and surface current. A test rig was specially designed and fabricated to study the influence of waves on the reaeration process. The wave frequency varied from 0.125 Hz to 0.425 Hz for various wave heights, , ranging from 0.15 cm to 1.5 cm. Based on the findings of the experimental study, the authors developed a modified film model and introduced a diffusive film-layer thickness as the characteristic length scale for the reaeration process. The thickness of the diffusive film layer may be determined readily in one of two ways: (1) as the ratio between the molecular diffusivity of dissolved oxygen and the measured oxygen transfer coefficient; and (2) estimated using its established functions with other concentration boundary layers proposed by various researchers. The modified film model was found to unify the present experimental data and published data.
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Acknowledgments
Financial support by Maritime Research Centre and DHI-NTU Centre, NEWRI, School of Civil and Environmental Engineering, Nanyang Technological University (NTU), Singapore is gratefully acknowledged.
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Published In
Journal of Environmental Engineering
Volume 140 • Issue 3 • March 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 7, 2013
Accepted: Oct 3, 2013
Published online: Oct 5, 2013
Published in print: Mar 1, 2014
Discussion open until: Apr 29, 2014
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