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