Hydraulic Study of the Onset of Hypoxia in the Tone River Estuary
Publication: Journal of Environmental Engineering
Volume 130, Issue 5
Abstract
Field measurements were conducted to investigate the onset and growth of hypoxia in the Tone River Estuary. Vertical profiles of dissolved oxygen (DO), salinity, and temperature were measured along the deepest line of the estuary. Rates of oxygen consumption by water and sediment in a salt wedge were obtained using laboratory tests. The measurements showed that hypoxia frequently occurred in the front part of the salt wedge and expanded its area toward the river mouth during the summer when the river flow rate was small. The data also suggested that the onset of hypoxia was delayed by the estuarine circulation which supplied oxygen-rich seawater to the salt wedge. To simulate this phenomenon, a two-dimensional flow model in the vertical-longitudinal plane was constructed by transversely integrating the model equations. The results of model simulation for three months in the summer of 1997 closely matched the field data. The model simulation proved that DO degradation is highly correlated with the residence time of salt water in the estuary.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 130 • Issue 5 • May 2004
Pages: 551 - 561
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Oct 18, 2001
Accepted: May 29, 2003
Published online: Apr 15, 2004
Published in print: May 2004
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