Hydrodynamic Modeling of the St. Lawrence Fluvial Estuary. I: Model Setup, Calibration, and Validation
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VIEW CORRECTIONPublication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 5
Abstract
In this study, a high-resolution, two-dimensional (2D), time-dependent hydrodynamic model of the St. Lawrence fluvial estuary was developed with the objective of documenting the tidal hydrodynamics of this complex yet poorly understood region. The hydrodynamic model solves the shallow-water equations over a finite-element–discretized domain, with an average spatial resolution of 50 m, and includes a drying–wetting component for the treatment of shallow intertidal areas. The numerical terrain model is composed of high-density topographic data and detailed friction fields associated with bottom substrate and macrophytes. Calibration and validation were carried out using recently acquired data for water level and velocity. Results show very good accuracy in water levels, with prediction skills higher than 0.99 at all stations (where a skill of 1 means perfect agreement between model and observations in terms of their relative average error) and root-mean-square errors (RMSEs) less than 5% of local tidal ranges downstream; at upstream stations where tidal ranges are significantly reduced, RMSEs were lower than 6 cm. Discharges were reproduced with similarly good accuracy, with errors lower than 6% of the maximum observed discharges at 11 of the 13 surveyed transects; the two remaining sections are subject to larger interpolation and bathymetric uncertainties. In this paper, critical aspects of model development are discussed, including the 2D approximation, temporal and spatial resolution, bathymetric uncertainty, error in the boundary conditions, and calibration under nonstationary conditions. This work is the first part of a two-part investigation serving as a methodological framework for model setup, calibration, and validation in large tidal rivers.
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Acknowledgments
Work by Pascal Matte was supported by scholarships from the Natural Sciences and Engineering Research Council of Canada and Fonds de recherche du Québec—Nature et technologies. The authors thank Environment Canada (Meteorological Service of Canada) for financial support; the Ministère du Développement Durable, de l’Environnement et de la Lutte contre les Changements Climatiques (MDDELCC) for financing the LIDAR campaign; and the Canadian Hydrographic Service (CHS) and Ministère des Transports du Québec (MTQ) for providing bathymetric and topographic data. Special thanks go to Olivier Champoux, Patrice Fortin, Jimmy Poulin, Charles Gignac, and Alain Soucy for their contribution to this work. The authors also thank Daniel Bourgault for his valued comments on a previous version of the manuscript and two anonymous reviewers for their constructive comments. Tide gauge data are available for download from the DFO’s Canadian Tides and Water Levels Data Archive (http://www.meds-sdmm.dfo-mpo.gc.ca/isdm-gdsi/twl-mne/index-eng.htm). The H2D2 software and source code are freely available for download, upon request to Yves Secretan, at http://www.gre-ehn.ete.inrs.ca/H2D2/contenu_download.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143 • Issue 5 • September 2017
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Received: Jul 5, 2016
Accepted: Jan 4, 2017
Published online: Mar 27, 2017
Discussion open until: Aug 27, 2017
Published in print: Sep 1, 2017
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