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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 12-year-measured tidal range data in Lianyungang coastal waters, the non-tidal water level was separated from the measured tide level by harmonic analysis method, then the characteristics of non-tidal water level fluctuation were analyzed by Empirical Mode Decomposition (EMD) method, The main factor of change. The results show that the non-tidal water level in Lianyungang coastal waters has obvious seasonal and interannual variations, and the winter and spring are multiple periods of non-tidal water level.The seasonal fluctuation of the substantial non-tidal water level is related to the storm surge in this area. Empirical mode decomposition of hourly non-tidal water levels reveals information on tidal periodicity of non-tidal water levels. Changes in wind and pressure are the main contributors to non-tidal water levels, both of which transfer energy to the water table primarily in the low frequency spectrum.