Based on the observations (1975-2010) at the Wusong Station, a typical tide station, the impact of variations in tidal level on tidal form was analyzed.The results show that the annual mean high (low) tidal level rises along with the rise of the annual mean tidal level, with significant linear correlation between them.However, there are no clear correlations between the tidal range, tidal duration and tidal level.In addition, there are no obvious correlations as well between the tidal level change and all extreme values, the annual highest (lowest) tidal level, the annual maximum flood (ebb) tidal range, the annual maximum (minimum) flood (ebb) duration, etc.%利用代表潮位站吴淞站1975～2010年实测资料,分析了长江口潮位变化对潮型的影响.研究结果表明,随着年平均潮位的上升,代表站年平均高(低)潮位会相应抬升,二者线性相关关系非常密切,而潮差、潮历时与年平均潮位的相关关系不明显.另外,年最高(低)高(低)潮位、年最大涨(落)潮潮差、年最大(小)涨(落)潮历时等各项极值与年平均潮位变化也没有明显的相关关系.
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