Determination of the lowest normal low water is the basis of hydrographic surveying and charting as well as the implementation of ocean engineering.As the number of permanent tide gauges along China coast is limited,estimation of the lowest normal low water accurately and fast in the areas with no observation data or short-term observation data has always been a difficult problem.Therefore,based on the internal relations between lowest normal low water and mean tidal range,using the continuous hourly observation data of 1 year at China's 17 tide gauges along the coastal areas of East China Sea,the harmonic constants are obtained,and the lowest normal low water is calculated by using the constituents.Furthermore,relationship between lowest normal low water and annual mean tidal range or monthly mean tidal range is statistically analyzed.The results show that relationship between lowest normal low water and annual or monthly mean tidal range has good correlation.This relationship can be applied to practical engineering to estimate the lowest normal low water.%基于理论最低潮面与平均潮差的内在联系,利用我国东部沿海17个验潮站连续369天的逐时潮位资料,进行调和分析得到相应的调和常数,并计算理论最低潮面.藉此,就理论最低潮面与年平均潮差及月平均潮差之间的关系进行统计分析.结果表明,理论最低潮面与年平均潮差及月平均潮差之间均具有较高的相关性,实际工程中可以利用此关系近似地确定当地理论最低潮面.
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