利用潮汐性质相似性的长江口水域深度基准面传递精度研究

根据长江口水域长期验潮站的潮位资料进行大量深度基准面传递试验,研究了深度基准面传递精度与潮汐类型值差、传递距离、地形环境特征之间的具体数值关系。该研究成果对长江口水域里深度基准面传递精度指标估计具有参考意义。

A Chart Datum Transfer Precision Model in the Yangtze River Estuary Based on Tidal Nature Similarity

The determination precision of temporary tidal gauge’s chart datum is influenced by tidalnature similarity,datum transfer distance and topographical environment characteristics.This paperhas studied the relationship between precision and influencing factors,and specific precision functionalmodels in south and north branches of Yangtze River Estuary have been given respectively,through alarge number of chart datum transfer tests with using tidal gauges’data in the Yangtze River estuary.The tests results indicate that the chart datum transfer precision in the south branch can be superior to8cm,when the difference of tidal type is less than 0.05and transfer distance is less than 80kilome-ters.While,the precision is 20cm in the north branch when the distance no less than 40km.The re-search achievement has an important significance to the determination precision of chart datum transferin the Yangtze River estuary.