Multiprofile Discharge Estimation in the Tidal Reach of Yangtze Estuary
Publication: Journal of Hydraulic Engineering
Volume 142, Issue 12
Abstract
With the advent of acoustic Doppler current profiler (ADCP), the velocity profile method or index velocity method based on a single profile or a fixed-depth cell has been recommended for estimating discharge in tidal reaches. However, in large tidal reaches with a width of nearly 6 km and cross-sectional variability of flow, such as Yangtze Estuary, these methods are not accurate enough for the discharge estimation. Therefore, an improved method named the multiprofile method, is proposed in this paper. The method includes four main steps: (1) calculating the cross-sectional area with stage data by considering the transverse slope; (2) calculating the depth-mean velocity at each fixed ADCP; (3) establishing the model with the multiprofile and estimating the cross-sectional mean velocity ; (4) estimating the final discharge through multiplied by . The proposed method was tested at the Xuliujing section of the Yangtze Estuary. The result shows that the multiprofile method averagely improves the accuracy by approximately 5.8% relative to the single-profile method in the discharge estimation, which proves the proposed method to be valid in the discharge estimation of large tidal reach.
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Acknowledgments
The authors are grateful to the Yangtze Estuary Hydrology and Water Resources Survey Bureau for their generosity in providing valuable observation data. This work would also not have been possible without the funding support of the Natural Science Foundation of China (NSFC) (coded by 41176068, 41376109, and 41576107), Key Laboratory for Digital Land and Resources of Jiangxi Province, East China University of Technology (coded by DLLJ201618), Research Funding of East China University of Technology (coded by DHBK2015312), and Research Foundation of Education Bureau of Jiangxi Province (code by GJJ150559).
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Published In
Journal of Hydraulic Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Oct 14, 2015
Accepted: Apr 28, 2016
Published online: Jul 15, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 15, 2016
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