中文摘要：

分析了目前中国海区海图深度基准面的现状,论证了用19a作为我国海图深度基准面历元周期的合理性,克服了不同时期数据海图深度基准面变动误差较大的弊端。并以10个主要长期验潮站为例,用调和分析方法分别以1a、18.61a及19a不同时间长度的潮汐观测序列,计算出对应的深度基准面,分析每19a调和分析结果数据所计算的理论深度基准面的稳定性,充分评估了每19a调和分析结果数据所计算的理论深度基准面的精度。为使所得海图深度基准面能够在一定时期内准确反映平均海面的变化,提供准确的深度基准面信息,提出了定期进行更新的思想。

英文摘要：

Based on the current status of chart datum determination algorithm in China,this paper presents the China Chart Datum Epoch as 19 a.The errors of chart datum calculated with different tide data were conquered.In this paper,10 suitable tide stations from the Bohai Sea,Yellow Sea,East China Sea and South China Sea were selected for computation.The chart data were calculated by harmonic tidal analysis with the tidal data of 1a,18.61 aand 19a,respectively.In order to display the variation of mean sea level precise and present the chart datum accuracy,periodic chart updating was proposed.