The upstream guide wall of flood discharge gate plays the role of restricting and guiding flow

 improving the inlet boundary conditions

adjusting the flow pattern

and ensuring the safe operation of hydraulic structures. This paper

taking a proposed hydropower station on Dadu river as the research object

presents the numerical simulation used to study pier head of three shapes: respectively circular

 streamlined

and square. The research results show that the backwater effect of the streamlined pier head is better than that of the circular pier head and the square pier head. The length of the detour flow zone around the streamlined pier head is 33.5%smaller than the circular pier head and is 62.3% smaller than the square pier head. The root mean square of the diversion ratio of the streamlined pier head is smaller than that of the square and circular pier heads

and the discharge capacity of the gate hole is more uniform. The relevant research results can provide guide for sluice design.