Journal
OCEAN MODELLING
Volume 83, Issue -, Pages 26-42Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ocemod.2014.08.005
Keywords
Boussinesq model; Circulation model; Coastal inundation; Spectral wave model; Storm tides; Wave setup
Categories
Funding
- NOAA Coastal Storms Program [NA05OAR4170060]
- NOAA Pacific Integrated Ocean Observing System Grant [NA11NOS0120039]
- US Army Corps of Engineers [W912HZ-09-C-0085]
- US Office of Naval Research Grant [N00014-12-1-0721]
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Modeling of storm-induced coastal inundation has primarily focused on the surge generated by atmospheric pressure and surface winds with phase-averaged effects of the waves as setup. Through an interoperable model package, we investigate the role of phase-resolving wave processes in simulation of coastal flood hazards. A spectral ocean wave model describes generation and propagation of storm waves from deep to intermediate water, while a non-hydrostatic storm-tide model has the option to couple with a spectral coastal wave model for computation of phase-averaged processes in a near-shore region. The ocean wave and storm-tide models can alternatively provide the wave spectrum and the surface elevation as the boundary and initial conditions for a nested Boussinesq model. Additional surface-gradient terms in the Boussinesq equations maintain the quasi-steady, non-uniform storm tide for modeling of phase-resolving surf and swash-zone processes as well as combined tide, surge, and wave inundation. The two nesting schemes are demonstrated through a case study of Hurricane Iniki, which made landfall on the Hawaiian Island of Kauai in 1992. With input from a parametric hurricane model and global reanalysis and tidal datasets, the two approaches produce comparable significant wave heights and phase-averaged surface elevations in the surf zone. The nesting of the Boussinesq model provides a seamless approach to augment the inundation due to the individual waves in matching the recorded debris line along the coast. (C) 2014 Elsevier Ltd. All rights reserved.
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