Flow state control structure and control method suitable for flood discharge tunnel torrent curve

The invention discloses a flow state control structure and control method suitable for a flood discharge tunnel torrent curve. The flow state control structure comprises a plurality of stages of gap type tongue pressing plates arranged in the curve with the maximum water flow climbing angle as the center. The two sides of each tongue pressing plate are fixed to the wall faces of the two sides of aflood discharge tunnel. The pressing angle of the tongue pressing plate located near the maximum water flow climbing angle is not larger than 10 degrees, then the pressing angles of the tongue pressing plates on the two sides of the maximum climbing angle are increased stage by stage, and the increasing amplitude of the pressing angles of every two adjacent stages of tongue pressing plates rangesfrom 3 degrees to 10 degrees. The climbing angle is the included angle between the water flow direction and the horizontal direction, and the pressing angle of each tongue pressing plate is the included angle between the pres