Infragravity waves in the Hualien Harbor

This study investigated the relationship between the group wave properties in the typhoon waves measured outside the Hualien Harbor and the long period waves inside. Groupiness factors defined with total run length, Smoothed Instantaneous Wave Energy History (SIWEH), and envelopes of the waves were used as group wave parameters. It was found that the standard deviation of the SIWEH and envelopes of the typhoon waves measured outside the harbor have relatively good relationship with the standard deviation of the long period wave measured inside the harbor. Spectral analysis on the envelopes of the waves outside the harbor showed that there was energy in the 60-300s period range.