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

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

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。

The determination precision of temporary tidal gauge;s chart datum is influenced by tidal nature similarity, datum transfer distance and topographical environment characteristics. This paper has studied the relationship between precision and influencing factors, and specific precision functional models in south and north branches of Yangtze River Estuary have been given respectively, through a large 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 to 8 cm, when the difference of tidal type is less than 0.05 and transfer distance is less than 80 kilome ters. While, the precision is 20 cm in the north branch when the distance no less than 40 km. The research achievement has an important significance to the determination precision of chart datum transfer in the Yangtze River estuary.