Abstract
This paper introduces Japanese Nationwide Ocean Wave information network for Ports and HArbourS (NOWPHAS) system, which recently improved for the directional and infra-gravity wave observation with continuous data aquisition. New concept of frequency banded expression has been introduced in the data analysis of directional and infra-gravity waves. Examples are demonstrated as the time series and annual statistics forms observed by the Japanese NOWPHAS system.The NOWPHAS new wave data acquisition and analysis system clarified the characteristics of the long period swells originated from typhoons and low pressures, and the 2001 Peru Earthquake Tsunami.
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