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在潮差逐日变化的半个朔望月的周期里，有朔望大潮，它与月相有关。半日潮港在朔望后的二、三日，因月球引起的潮汐和太阳引起的潮汐相加，潮差最大，是为大潮。而朔和望的大潮又随着不同的年份和不同的月份而发生变化，本文通过分析引潮势的系数，采用静力潮的概念从理论上导出这种变化，并利用青岛大港验潮站10年的资料进行验证。结果无论从理论上和实测资料上都可得出：在多数的月份里，朔的大潮比望的大潮要大一些。对青岛验潮站10年验潮资料进行分析，得出平均状况为，朔的大潮比望的大潮大2．93cm，
In the tidal cycle of changes in the half a month, there is a new moon, it is related to the moon phase. Half tide Hong Kong in the second and third days after the lunar new moon, due to the tide caused by the moon and the sun-induced tidal sum, the tidal range is the tide. However, the tide of Shuohewang changed with different years and different months. In this paper, by analyzing the coefficient of tide potential and using the concept of static tide, the paper theoretically derived this change, Year of data verification. The results can be drawn from both theoretical and measured data: in most months, the moon’s tide is larger than expected. Based on the analysis of 10-year tide survey data of tidal gauge station in Qingdao, the average condition is that the tidal tide of the new moon is 2.93 cm larger than that of the tide,