感潮河段确定水位流量关系方法探讨

Discussion on Stage Discharge Relations in Tidal Reaches

感潮河段受潮汐影响,同一水位下流量变幅大,难以确定其水位流量关系,给水文报汛及防灾减灾工作造成影响。通过分析2008.6大洪水期间,珠江三角洲河口区上下游站点不同的洪潮组合,采用传统方法及移动平均法进行感潮河段水位流量关系的定线,发现25 h移动平均法简便快捷,能准确确定水位流量曲线走向,对涨潮平均潮差减小超过40%的感潮河段定线有极大的帮助,比实测点及传统方法定线效果更优。该方法对其他感潮河段水位流量关系曲线确定具有参考价值。

Due to the influence of tide,the discharge of tidal reach varies greatly at the same water level,which makes it difficult to determine the relationship between water level and discharge,and affects hydrological flood reporting and disaster prevention and mitigation.Through the analysis of different flood-tide combinations at upstream and downstream stations in the Pearl River Delta Estuary during the 2008.6 flood period,the traditional method and moving average method are used to determine the water level-discharge relationship of tidal reach.It is found that the 25-hour moving average method is simple and fast,and can accurately determine the trend of water level-discharge curve,and the average tidal range of flood tide disappears beyond the limit.Over 40%of tidal reach alignment is of great help,and the effect is better than that of measured points and traditional methods.This method has reference value for the determination of water level-discharge curve in other tidal reach.