设计潮位计算中若干问题探讨

针对感潮河段潮位序列的不一致现象,提出了一种通过提取序列趋势项进行资料一致性修正的方法。针对低潮位系列容易呈“负偏态”分布的事实,介绍了负偏态潮位系列的频率计算方法,提出了一种融入更多潮位过程特征信息的设计潮位过程推求方法,以长江口天生港、徐六泾、外高桥潮位站为例,采用上述方法计算了典型站的设计潮位和设计潮位过程。研究表明,所提出的方法概念清楚、计算简便、适用性强,对类似潮汐河口设计潮位和设计潮位过程计算具有参考意义。

Problems and Improvements in Design Tidal Level Calculation

Considering the inconsistency of level data in tidal reach,a method correcting the data by drawing the trend equation from its time series was proposed.In accordance with the fact that the skewness coefficient (Cs) of low-tide level series is readily negative,the frequency analysis with negative Cs was introduced.With more characteristic values taken into account,an improved method for deduced design tidal level process was presented.With Tianshenggang,Xuliujing and Waigaoqiao tide stations in the Yangtze Estuary taken as examples,above methods were applied to calculate design tidal levels and design tidal level processes of typical stations.The research results show that these methods are definite in conception,simple in calculation,and applicable to different cases,they will provide reference for the computation of design tidal level and design tidal level process in other estuaries.