航渡式水深测量水位改正优化:(一)潮汐模型评估

Optimization research about hydrographic waterlevel correction of single sea route(一)accuracy evaluation about DTU23 and FES2014

针对全球海域航渡式水深测量水位改正难题,对最新潮汐场模型DTU23和代表性强的FES2014开展了精度评估,结果表明在北半球12个验潮站位处DTU23与ArcTiCA中8个主要分潮总体预报误差为8.64 cm,在莫桑比克海峡12个随机点位处DTU23与FES2014中8个主要分潮总体预报误差仅1.19 cm,而在2个不同海域分潮振幅和迟角的等值线图则表明DTU23与CST1相似性较强,DTU23与FES2014相似性极强。提出了融合全球潮汐模型并新构建全球Sa、Ssa长周期分潮和小区域精细化潮汐模型的水位改正优化新思路,可为后续进一步提高全球海域航渡式水深测量水位改正精度提供数据支撑。

Aiming at the difficult problem of water level correction for hydrographic surveying in global sea area,the accuracies of DTU23 and FES2014 are evaluated in advance.The results show that at 12 tide stations in the Northern Hemisphere,compared with ArcTiCA,the overall prediction error of 8 main constituents in DTU23 is 8.64 cm,and compared with FES2014 at 12 random points in the Mozambique Channel,the overall prediction error of 8 main constituents in DTU23 is only 1.19 cm.The contour maps of tide amplitude and phase lag show that there is a strong similarity between DTU23 and CSTI,and between DTU23 and FES2014.On the basis,a new idea of water level correction and optimization is put forward,which integrates several global tidal models and constructs global Sa and Ssa long-period tidal constituents and regional fine tidal model.It can provide reliable data for the subsequent water level correction for hydrographic surveying in global sea area.