长江下游典型代表性潮型选择研究初探

Primary research on typical representative tidal type selection in the lower Yangtze River

通过建立大通至长江口一维水沙数学模型,在实测资料验证的基础上计算得出沿程各站逐时潮位。利用计算得出的逐时潮位资料,研究了江阴、徐六泾和六效的高潮位以及日平均潮位与上游大通径流量的相关关系,分析上游径流与近河口河段潮位影响趋势。通过一维水沙数学模型结合不同潮差累积频率的代表性潮型作为下游控制条件计算,在比较河段实测冲淤量与计算冲淤量的基础上,分析不同潮差累积频率的代表性潮型适应性。

According to the one-dimensional water and sediment mathematical model for the river reach from Datong to the Yangtze Estuary,the hourly tidal level of each station was calculated on the basis of the measured data.The connection between the high tidal levels along with daily average tidal level and the runoff flux in Datong at Jiangyin,Xuliujing and Liuxiao was specifically investigated using the hourly tidal level information obtained from the numerical simulation,and the impact tendency of upstream runoff and tidal level near the estuary was analyzed.One-dimensional water-sediment mathematical model with the cumulative frequency under different tidal ranges was adopted as the control condition for downstream.Based on the comparison between actual and simulated scouring-siltation volume,the adaptability of typical tidal type for cumulative frequency of different tidal ranges was investigated.