The correlations between the tide level of coast tidal gauge stations and the tide level of offshore sand ridges , and between mean high water level and mean water level as well as mean sea - level were discussed when studying the tidal gauge records 在潮位資料的分析過程中還探討了沿岸驗潮站與岸外沙洲潮位的相關性以及平均潮位、平均高潮位和平均海平面之間的相關關系。