長周期波の周波数成分別特性の違い (東日本沿岸域)

抄録

Infragravity waves are generally analyzed as components whose frequencies are more than thirty seconds. As many components are included in the frequency area, it is necessary to clarify the characteristic of each component.
We analyzed wave height data of four components (30-60s, 60-300s, 300-600s and 600s-) of infragravity waves compiled by NOWPHAS system. This study reveals that the characteristics of infragravity waves are very different depending on frequencies and sea areas. The wave height longevity of the longer component (600s-) is smaller than those of shorter components.