事故闸门 meaning in English

emergency gate
stop gate

The spillway tunnel at xiluodu hydropower station has the characteristics of large discharge and high flow velocity , for which the hydraulic characteristics of the emergency gate and the dynamic properties of gate structure during shutting down under hydrodynamic condition are directly related to the technical feasibility and the safety reliability of the spillway tunnel operation
摘要溪洛渡水电站泄洪洞具有泄量大、流速高等特点，事故闸门动水下门过程中的水力学特性以及门体结构的动力性能直接关系到泄洪洞运行的技术可行性和安全可靠性。