水位改正中的基准面空间内插及其误差约束

Datum Interpolation in Water Level Correction and Technique for Restricting Its Error

分析了水位改正中隐含的基准面空间内插形式,理论推导了基准面空间内插的数学描述,表明水位改正中隐含的基准面空间内插方式与潮汐比较参数的内插方式相一致,基准面空间内插误差为基准面相对平均海面的垂直差距的空间内插误差。仿真实验对此进行了验证。现阶段减弱与控制该误差的最可行手段是,由L值模型仿真不同验潮站空间配置下基准面空间内插误差的空间分布,为验潮站布设设计提供先验信息。而未来建立以平均海面为基本海洋垂直基准的综合海洋垂直基准框架是最有效手段。海洋测量水深数据的处理和计算机存储都应保留以平均海面为基准面的成果,通过垂直基准转换方式可满足多用途需求。

The datum spatial interpolation is involved in the water level correction calculated by several tide stations.Its mathematical representation is deduced.The expression shows that the datum is interpolated in the same way that the tidal comparative parameters are, and the error of spatially interpolated datum is the error of the interpolation of the difference between the corresponding datum and the mean surface level.The above points proved by the simulation to be the case.The feasible solution of restricting the error is that the distribution of the error in different distribution of tidal gauges can be simulated by datum model, and it will be the prior information for layout of tidal gauges.In the future, the best solution is the integrative ocean vertical datum system based on mean surface level.The depths referred to mean surface level should be saved which can meet multiple-needs through vertical datum transformation.