深度基准面的略最低低潮面比值传递法研究

Research on Indian Spring Low Water Ratio Datum Computation Method

基于精密潮汐模型分析了略最低低潮面相对理论最低潮面比值的空间分布,等值线图表明比值在空间上分布复杂,略最低低潮面比值法的适用性不能以距离或潮汐类型相似性作为判断标准。以中国沿岸3组典型验潮站为例,统计不同同步时长下的传递精度。统计结果表明,同步时长达到7d,传递误差已较稳定,但可能存在系统偏差,取决于该方法的适用性。文中给出了比值在中国近海的等值线分布图,可作为适用性判断的参考。

Spatial distribution of the ratio of Indian Spring Low Water （ISLW） to Lowest Normal Low Water （LNLW）,calculated by tide model,is analyzed.The contour shows complex distribution over China Seas.So the applicability of the ISLW ratio method can51 be judged by the distance or the type of tide.Based on three pairs of tidal stations, the accuracy of transferring in different synchronous time length is assessed. When the synchronous time length is longer than 7 days, the variations of the error are in 15cm. Systematic error may be exist according to the applicability of the ISLW ratio method. Contour of the ratio ISLW to LNLW is given as the reference for the applicability judgment.