摘要
基于连云港近岸海域12年实测潮位资料,采用调和分析方法将非潮汐水位从实测潮位中分离.然后用经验模态分解(EMD)方法分析了非潮汐水位波动的特征,探讨了引起非潮汐水位变化的主要因素。结果表明,连云港近岸海域非潮汐水位具有明显的季节性和年际变化.冬季和春季是非潮汐水位的多发期.大幅度非潮汐水位的季节性波动同该海域的风暴潮发生有关。逐时非潮汐水位经验模态分解揭示了非潮汐水位的潮汐周期变化信息。风和气压变化是引发非潮汐水位的主要因素,两者主要在低频谱段把能量传递给水位。
Based on the 12 year tidal data measured in I.ianyungang nearshore area, harmonic analysis method was used to separate the non-tidal water levels from the tidal data, then EMD method was ap- plied to analyze the characteristics of the non-tidal water level variability, and the main factors which caused the non-tidal water level fluctuations were discussed. Results show that the non-tidal water lev els have obvious seasonal and interannual variations. Winter and spring are the period of high incidence of the non-tidal water level fluctuations, and large amplitude of them was related to the storm surge. EMD reveals that hourly non-tidal water level contains the tidal cycle change. Wind and pressure are the main factors which cause the non-tidal water level variation. Both of them mainly pass the energy on the water level in low frequency.
出处
《海洋湖沼通报》
CSCD
北大核心
2013年第3期56-62,共7页
Transactions of Oceanology and Limnology
基金
淮海工学院自然科学基金项目(KQ11009)资助
关键词
非潮汐水位
变化
近岸海域
连云港
Non-tidal waterlevel
variability
nearshore area
I.ianyungang
