Group waves and infragravity waves in the Hualien Harbor

• Main Authors: Yi-Chung Yang, 楊一中
• Other Authors: Cheng-Han Tsai
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/20528444909570811938

碩士 === 國立臺灣海洋大學 === 海洋環境資訊學系 === 98 === 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 the harbor. Group factor defined with Smoothed Instantaneous Wave Energy History (SIWEH), envelopes, and total run length 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 relative 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 75-150s period range, and 75-150s period range showed with the waves inside the harbor. This study also used time-frequency analysis to calculated the time difference between with peak energy of the envelope of the waves outside the harbor and that of the waves inside harbor. It was found that about 43% of the measurements corresponds with the time for the shallow water wave to travel from the entrance to the inner end of the harbor.