Wavelet analysis of coastal-trapped waves along the China coast generated by winter storms in 2008

• 作 者: LI Junyi ZHENG Quanan HU Jianyu FAN Zhenhua ZHU Jia CHEN Tao ZHU Benlu XU Ying
• 机 构: State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen Univ
• 出 处: Acta Oceanologica Sinica
• 发表日期: 2015年11期
• 关键词: coastal-trapped waves wavelet analysis tidal gauge records winter storm China co

This study applies the wavelet analysis to the tidal gauge records, alongshore winds, atmospheric temperature and pressure along the China coast in winter 2008. The analysis results show three events of sea level oscillations(SLOs) on the shelf induced by winter storms. The first event occurred from January 9 to 21. The SLO periods were double-peaked at 1.6–5.3 and 7.0–16.0 d with the power densities of 0.04–0.05 and 0.10–0.15 m2·d, respectively.The second event occurred from February 5 to 18. The SLO period was single-peaked at 2.3–3.5 d with power density of 0.03–0.04 m2·d. The third event occurred from February 20 to March 8. The SLO periods were doublepeaked at 1.5–4.3 and 6.1–8.2 d with the power densities of 0.08–0.11 and 0.02–0.08 m2·d, respectively. The SLOs propagated along the coast from Zhejiang in north to Guangdong in south. The phase speeds ranged about 9–29m/s from Kanmen to Pingtan, 5–11 m/s from Xiamen to Huizhou and 11–22 m/s from Huizhou to Shuidong. The dispersion relation of the SLOs shows their nature of coastal-trapped wave.

This study applies the wavelet analysis to the tidal gauge records, alongshore winds, atmospheric temperature and pressure along the China coast in winter 2008. The analysis results show three events of sea level oscillations (SLOs) on the shelf induced by winter storms. The first event occurred from January 9 to 21. The SLO periods were double-peaked at 1.6-5.3 and 7.0-16.0 d with the power densities of 0.04-0.05 and 0.10-0.15 m2 · d, respectively. The second event occurred from February 5 to 18. The SLO period was single-peaked at 2.3-3.5 d with power density of 0.03-0.04 m2 · d. The third event occurred from February 20 to March 8. The SLO periods were doublepeaked at 1.5-4.3 and 6.1-8.2 d with the power densities of 0.08-0.11 and 0.02-0.08 m2 · d, respectively. The SLOs propagated along the coast from Zhejiang in north to Guangdong in south. The phase speeds ranged about 9-29 m / s from Kanmen to Pingtan, 5- 11 m / s from Xiamen to Huizhou and 11-22 m / s from Huizhou to Shuidong. The dispersion relation of the SLOs shows their nature of coastal-trapped wave.