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对长江口地区吕泗、吴淞、中(氵尤夂)、金山嘴等验潮站海平面资料进行频谱计算并对其中的频谱峰值进行周期性检验后,得到年以内周期分量为:年周期、半年周期、1/3年周期、近点月周期(27.55天)、24.1天周期、半朔望月周期(14.76天)、13.66天周期、9.6天周期、7.7天周期等。为了排除干扰、消除周期因子对海平面变化的影响,需对其主要的周期分量设计数字滤波器进行滤波。
After calculating the sea level data of the tide gauge stations in Lvsi, Wusong, Zhongyu (Jiyuankuang) and Jinshanzui in the Changjiang Estuary, and periodically checking the peak values of them, the periodic components within the year are obtained as follows: year period, Half year period, 1/3 year period, near point month period (27.55 days), 24.1 day period, half moon period (14.76 days), 13.66 day period, 9.6 day period and 7.7 day period. In order to eliminate the interference and eliminate the influence of the periodic factor on the sea level change, we must filter the digital filter of its main periodic component design.