中文摘要：

为解决强潮海域闸下潮位变化剧烈的船闸输水系统水力学计算问题，以现有规范为基础，从输水计算原理出发，推导了变动水位条件下的输水水力学计算方法，应用该方法计算分析了变动水位对三堡船闸安保工程输水的影响，并对闸室面积、初始水头、闸外落潮速度等因素进行敏感性计算分析。结果表明，采用该方法计算得到变动水位条件下输水时间缩短，最大流量、最大比能也小于取初始恒定水位的计算成果，结果更符合强潮海域船闸实际输水过程，为类似条件船闸输水水力学计算提供了一种技术、经济合理可行的计算方法。

英文摘要：

To improve hydraulic analysis of filling and emptying system of ship locks that are located in strong tidal areas, a new hydraulic calculation method was developed. This method is based on the theoretical principles of ship lock＇s filling and emptying, considering the significant variation of water levels downstream of ship locks. This new hy- draulic calculation method was used to analyze the Sanbao ship lock in Zhejiang province China, and evaluated the sensitivity of three factors： chamber area, initial water head, descending rate of downstream water level. The results showed that, when comparing to the analysis on constant water levels, the new calculation method revealed shorter filling time, lower peak flow and energy ratio. This study indicates that the new method can provide an appropriate evaluation of filling and emptying system on the impact of water level variation on downstream of ship locks. Findings from this study can be used to support technical design and operation of ship locks in strong tidal sea and estuary.