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表孔门槽与二维凹槽在水力特性上有很大的差异，这决定了它们在空化特性上也有所不同．由于流动形式和堰面曲率的影响，表孔水流往往在堰面上压力低、流速高；在门槽底部，由于压差的作用，槽内旋涡常常随绕流从下游角隅绕出槽外．堰面、涡心以及绕流区的交汇，使压力剧烈下降，极易在门槽下游边墙底部发生混合型空化，其初生空化数远大于水洞中二维凹槽的初生空化数，应在设计中引起重视．
Table hole groove and two-dimensional groove on the hydraulic properties are very different, which determines their cavitation characteristics are different. Due to the influence of the flow pattern and the curvature of the weir surface, the water in the gauge hole often has low pressure and high flow velocity on the weir surface. Due to the effect of pressure difference, the swirling vortex in the groove often flows out of the trough from the downstream corner in the bottom of the trough, . The intersection of the weir surface, the vortex core and the circumfluence area make the pressure drop violently, and it is easy to occur mixed cavitation at the bottom of the downstream side wall of the door groove. The number of primary cavitation is much larger than the primary cavitation in the two-dimensional groove in the water hole Number, should pay attention to the design.