The Establishment of Chart Datum Based on Tide Constituent Recombination and Tidal Constraint in Jiangsu Coast
The construction of seamless chart datum has great significance for marine mapping and engineering in coastal wa-ters of Jiangsu. However,the precision of tidal model used to construct the datum is poor in offshore waters. To solve this problem,several long-term tide observation stations along the Jiangsu coast are used to evaluate the accuracy of three main tidal models,FES2014,TPXO9 and DTU10,respectively,and then a new tidal model is reconstructed by recombining the optimal tide constituents. Then,ratio and difference meth-od are used to refine the recombination model respectively. The results show that the difference method is better and more stable,which can improve the accuracy of the tidal mod-el in the nearshore waters by about 40％. According to the re-fined recombination model,the seamless chart datum is built. The variation trend and characteristics of the datum are rela-tively consistent with the characteristics of the local tidal range in the sea area.
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