河口挡潮闸闸下低潮缺失水位修正方法

摘要

河口挡潮闸闸下低潮水位资料周期性缺失可能导致闸下潮汐调和分析结果出现偏差,从而直接影响到闸下水位过程的预报精度.针对这一问题,提出了一种闸下低潮缺失水位的修正方法,利用潮汐过程曲线的对称性对低潮缺失水位资料进行初步修正,然后根据调和分析自报结果对修正数据进行迭代更新,直至潮汐调和常数不再变化.验证结果表明,该方法可有效提高闸下水位过程的自报精度,其成果在2014年宁波高背浦闸闸下测站的潮汐预报中得到了良好应用.%The periodic lack of database about water level below low tide is a normal problem in the downstream area of a barrage in tidal estuaries, which may cause significant errors in harmonic analysis of the tidal level at that area. A modified method is proposed to solve this problem. The preliminary modification is to approximate the missing low water level by the neighboring measured high water level based on the tidal asymmetric characters, then the self-modification is repeatedly performed until the tidal harmonic constants keep unchanged. Verification results show the modification method can effectively and efficiently solve the question associated with the missing low tide data problem. This method is successfully applied in the forecast of tidal level in Gaobeipu, Ningbo in 2014.