Discharge Estimation of a Tidal River with Reverse Flow: Case of the Chao Phraya River, Thailand
Publication: Journal of Hydrologic Engineering
Volume 21, Issue 4
Abstract
The aims of this research are to investigate the hydrodynamics in the downstream part of a tidal river and to rapidly estimate the discharge in the case of the lower Chao Phraya River, Thailand. During flood tide, the depth of the maximum velocity shifts toward the river bottom, whereas during ebb tide, the maximum velocity is located near the water surface. The discharge can be estimated from the area and the mean velocity, which is obtained from the entropy parameter and measurement of maximum velocity. When the entropic linear relationship is assumed to be constant for a station, the estimated discharge is lower than the measured value at flood tide, and in contrast, the estimated discharge is somewhat higher than the measured value at ebb tide. To get a highly reliable value of discharge estimation, the variation in location of maximum velocity with flood and ebb tides must be considered, especially where the location of measurement has a strong influence from tides.
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Acknowledgments
The authors would like to thank the Joint Graduate School of Energy and Environment KMUTT and the National Research University Project (NRU) of Thailand’s Office of the Higher Education Commission for their financial support for the study.
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Information & Authors
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Published In
Journal of Hydrologic Engineering
Volume 21 • Issue 4 • April 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Nov 27, 2014
Accepted: Sep 28, 2015
Published online: Dec 17, 2015
Published in print: Apr 1, 2016
Discussion open until: May 17, 2016
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