Waves and Currents in Hawaiian Waters Induced by the Dispersive 2011 Tohoku Tsunami
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This study focuses on the effects of frequency dispersion on tsunami-induced coastal water waves and currents, exemplified by the 2011 Tohoku tsunami event. The investigation relies on numerical simulations. We start from a tsunami source constrained through the inversion algorithm of NOAA’s tsunami inundation forecast system. The trans-Pacific propagation and the hydrodynamic processes in the Hawaiian Islands region are simulated with a weakly dispersive Boussinesq model and a shallow-water model that neglects dispersion effects. From these modeling results, boundary conditions are derived to force the high-resolution simulations in the coastal waters in the Hawaiian Islands region through MOST, a tsunami simulating code based on the shallow-water theory. We note that the dispersion effects generally lower the amplitudes of leading waves. Trailing waves of short wavelengths and high amplitudes can develop in coastal waters. A model neglecting dispersion effects could under-predict the wave heights and current speeds at the trailing waves.
KeywordsWater waves Currents Coastal waters Dispersion 2011 Tohoku tsunami
This study is partially funded by the Joint Institute for the Study of the Atmosphere and Ocean, Contribution No. 2171, the Pacific Marine Environmental Laboratory, Contribution No. 4046, under NOAA Cooperative Agreement No. NA10OAR4320148, and the US Nuclear Regulatory Commission (NRC), Office of Nuclear Regulatory Research under Interagency Agreement RES-07-004 Project N6401. We thank G. Mungov at the National Geophysical Data Center for the wave data at DART stations, P. Burke at NOS for the current data at the NOS ADCP stations, and E. Pawlak at the University of California, San Diego for the wave and current data at the Kilo Nalu station. We are grateful to R. Anooshehpoor at NRC, A. Rabinovich at the Russian Academy of Sciences and Institute of Ocean Sciences of Canada, and two anonymous reviewers for helpful revision advice. This report was prepared as an account of work sponsored by an agency of the US Government. Neither the US Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for any third party’s use, or the results of such use, of any information, apparatus, product, or process disclosed in this report, or represents that its use by such third party would not infringe privately owned rights. The views expressed in this paper are not necessarily those of the US Nuclear Regulatory Commission.
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