FUNDAMENTAL STUDY ON ASSIMILATION OF TSUNAMI CURRENTS OBSERVED BY HF OCEAN RADAR

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  • HFレーダーによる観測津波流速のデータ同化に関する基礎検討

Abstract

<p> This study develops how to assimilate tsunami currents observed by high frequency ocean radars in three dimensional current modeling for the projection of tsunami debris in case the Nankai Trough Megathrust earthquake occurs. Regional Ocean Modeling System (ROMS) is used for the assimilation in Osaka Bay with forcings of tides, freshwater, and wind as well as tsunami currents in three dimensional coordinates. In order to assimilate the tsunami component of the surface currents with the consideration of a tsunami’s momentum, high-frequency component is extracted from the observed surface velocities using discrete wavelet transform and assimilated to all vertical layers by nudging. This pragmatic approach better represents both of currents and surface elevation.</p>

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