Regional Wave Modeling and Evaluation for the North Atlantic Coast Comprehensive Study
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 2
Abstract
Accurate estimation of storm surge along the coasts subject to extreme storm conditions requires proper wind and pressure forcing and quantification of the wind waves resulting from local and far-field energy sources. This paper summarizes the steps involved in accurately representing the offshore wave climate for the North Atlantic Coast Comprehensive Study (NACCS) domain, defined from the United States–Canadian border in Maine to the Virginia–North Carolina border. The motivation of the regional wave modeling is to provide offshore boundary conditions for the simulation of extreme extratropical and synthetic tropical events to drive the nearshore wave and surge modeling efforts within the NACCS. The offshore wave conditions were estimated using the third-generation WAve Modelling (WAM) model. Value-added wind fields were defined for each of the four wave model grids (North Atlantic Ocean Basin, U.S. Coastal Regional scale, and two subregional-scale grid systems covering the NACCS coastal domain). Five tropical events (Hurricanes Sandy, Irene, Isabel, and Gloria and Tropical Storm Josephine) and 17 extratropical events were simulated to evaluate WAM’s performance. Model results were compared with 30 point-source measurements available during these storm events. Time, scatter, and quartile-quartile plots; Taylor diagrams; and a battery of statistical tests were used in the evaluation process. The WAM provided quality zero-moment wave height estimates, with biases in the range of −0.07 to −0.14 m, RMS errors (RMSEs) of about 0.40 m, scatter indexes (SIs) around 25%, and a correlation of 0.95 compared with the measurements. The wave period results contained the greatest errors with peak period biases of −0.26 to 0.06 s, RMSEs from 2.4 to 2.7 s, SIs near 25%, and a correlation between 0.47 and 0.59. The mean period biases were about −0.70s, RMSEs were about 1.5 s, and there was a correlation of 0.6–0.7. The mean wave direction biases ranged from 4.5 to −0.34° with RMSEs of 55°.
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Acknowledgments
The authors acknowledge and thank the other members of the NACCS numerical modeling production team and all members of the USACE Engineer Research and Development Center’s Coastal & Hydraulics Laboratory.
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© 2016 American Society of Civil Engineers.
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Received: Mar 3, 2015
Accepted: Feb 22, 2016
Published online: Mar 29, 2016
Discussion open until: Aug 29, 2016
Published in print: Mar 1, 2017
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