感潮河道上挡潮闸的水力设计与上游涝水、下游潮位涨落情况关系密切且复杂，目前尚无标准计算方法。某沿海挡潮闸外移建设中由于未足够重视基础资料收集，消能设计水位组合不甚合理，造成工程消能设施损坏严重，因此有较长港道的挡潮闸外移时，重新论证新闸处潮位数据显得非常重要。通过剖析工程存在的问题根源，在该工程加固改造设计过程中，深入分析了挡潮闸闸孔总净宽计算、消能防冲设施设计等关键技术问题，可供类似挡潮闸设计工作参考。

The hydraulic design of the tidal gate is in close relationship with upstream excess water and downstream tide; however, there is no standard calculation method for the hydraulic design. In this paper, a tidal gate in the coastal area was studied. Due to the lack of collection of basic information during the construction of the tidal gate, the combination water level of energy dissipation design was not reasonable, which caused serious damage to the engineering energy dissipation facilities. When there is emigration for the tidal gate in the long channel, the tidal information in the new gate is of important significance. Based on the analysis of the causes of problems, during the reinforcement reconstruction, several key technical problems were analyzed such as the calculation of total clear width of tidal gate and design of energy dissipation and scour prevention, which can provide references for the design of similar tidal gates.