东印度洋海域最优深度基准面模型构建

Construction of Optimal Depth Datum Model in the Eastern Indian Ocean Using Tide Gauge Data

利用东印度洋海域周边长期验潮站实测数据、TOPEX/Poseidon等系列卫星测高反演结果,评估了DTU10,EOT11a,FES2014,GOT4.8,OSU12和TPXO8六种全球潮汐模型精度,根据卫星测高结果给出了浅水分潮改正量和长周期分潮改正量的经验模型,又在此基础上分析并构建了研究区域精度最优的深度基准面模型。考虑到全球潮汐模型在近岸的影响因素及验潮站位置,将13个验潮站分成开阔海域与近海海域两类,与潮汐模型的对比,结果表明,DTU10和FES2014模型分别在开阔海域和近海海域精度最优。根据潮汐模型在不同分潮处的精度,如EOT11a模型在O1和K1分潮处精度较高,DTU10在N2,M2,S2和K2分潮处精度较高等,分别构建了开阔海域与近海海域的组合深度基准面模型,计算得知误差分别为11.33和20.95 cm,其精度显著提高。

This study performed accuracy assessment of six global tidal models such as DTU10,EOT11a,FES2014,GOT4.8,OSU12 and TPXO8 by using the measured data from long-term tide stations in the eastern Indian Ocean and TOPEX/Poseidon series satellite altimetry inversion results.According to the satellite altimetry results,this study presented an empirical model of shallow water tide correction and long-period tide correction.On the basis of above results,we analyzed and constructed the depth reference plane model with the best accuracy of the study area.Taking into account the influencing factors of the global tidal model and the location of the tide station,13 tide stations are divided into two types,open seas and offshore waters.Compared with the tidal models,the DTU10 and FES2014 models have the best precision in open sea and offshore,respectively.According to the accuracy performance of the tidal model at different points of the tide,we constructed the precision depth datum model of the open sea and the offshore sea,respectively.Compared with the error(16.43 cm)from the depth datum based on the DTU10 model,the error from the precision depth datum model is 11.33 cm.And,compared with the error(26.70 cm)from the depth datum based on the FES2014 model,the error from the precision depth datum model is 20.95 cm.