基于不同水位观测时长下的深度基准面精度分析

Accuracy analysis of obtaining depth base level for different water level observation duration

深度基准面是海图水深的起算面,其精度直接影响着真实水深的精度。《海道测量规范》中对深度基准的求解方法进行了规定,但是未对其求解精度进行要求。因此本文采用我国10个验潮站19a间水位观测数据,分析了各站点不同水位观测时长求解的平均海面精度和深度基准精度,实验结果表明,对于港航区域重要长期验潮站,海图深度基准的设定应该采用基于多年平均海面的深度基准结果;对于短期验潮站来说,基于多年平均海面、年平均海面和转测邻近长期站平均海面三者得到的月深度基准精度大概在5-20cm,且三者之间差别不大。

The depth datum is the starting surface of chart water depth,and its accuracy directly affects the accuracy of real water depth.The solving method of depth datum is specified in the Sea Passage Measurement Specification,but the related accuracy is not required.In this paper,19 years of sea level observation from 10 tide stations in China are used to analyze the mean sea level accuracy and depth datum accuracy of different observation time of each station.At the same time,the accuracy range of depth datum based on different types of mean sea level is analyzed.The accuracy reference is provided for setting the depth datum in the actual bathymetric survey.