Based on the physical model test and theoretical analysis, the discharge capacity of sluice under the tidal action was studied, some new understanding achieved:1) It's feasible to study the discharge characteristics by taking the sluice engineering and the internal and external cohesion engineering as a whole;2) There is a good lin-ear relationship between the discharge flow and the relative opening degree of the sluice, when the internal water level as well as the external one is determined; 3) A method to calculate the critical opening degree is proposed which can be used to distinguish the sluice gate discharge from the gate fully opening condition; 4) The formula to calculate the drag coefficient under sluice gate discharge and gate fully opening condition is proposed;5) The formu-la to calculate the discharge flow with higher accuracy under sluice gate discharge is proposed based on the consid-eration of several factors, such as the water level difference between upstream and downstream, the area of the gate hole, the water depth ratio of upstream and downstream, etc.%依据物理模型试验及理论分析方法开展了潮汐作用下水闸的泄流特性研究,取得了新认识:1)将水闸工程及内外衔接工程作为一个整体来研究其泄流特性是可行的;2)在外河水位与内河水位确定条件下,水闸泄流流量与相对开度呈良好的线性关系;3)提出了区分闸孔出流条件与闸门全开条件的临界开度的计算方法;4)提出了闸孔出流条件和闸门全开条件下的阻力系数计算公式;5)在综合考虑上下游水位差、闸孔面积以及上下游水深比值等因素基础上,提出了计算精度更高的闸孔出流条件下泄流流量计算公式.
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