It makes the deduction on design tidal level process more reasonable than ever . finally , taking into account the observed data of tidal level are much more integrated than observed data of tidal discharge and the correlative relationship are established based on large numbers of samples . then , the sub stage maximum tidal discharges and tidal velocities are obtained according to the regressive equations and the observed tidal level , and the sub stage design maximum tidal discharges and tidal velocities are estimated by way of frequency analysis 最后，针对桥位河段实测潮流资料短缺而潮位资料相对完整的实际情况，基于大量样本建立了潮流量与潮汐要素的相关关系，利用实测长系列潮位资料得到分期最大潮流量、潮流速系列，经频率分析确定了分期设计最大潮流量、潮流速。
And used this standard ( large than ex + 3 x x ) to estimate the design sub stage maximum tidal levels using the frequency analysis . an improved method to deduce design tidal level process is put forward , using both designs maximum anneal tidal level and design maximum annual tidal range 探讨了不同参数估计方法下如何判别特大值，并用得到的判别标准(大于ex + 3 x )对修正后的分期最高潮位序列进行频率分析确定了分期设计最高潮位。提出了以设计年最高潮位和设计年最大潮差共同控制典型潮位过程放大的设计潮位过程推求方法，使设计潮位过程的推求更趋合理。
