Pit flushing prediction method considering river flow velocity

The invention discloses a pit flushing prediction method considering river flow velocity, and belongs to the technical field of water conservancy and hydropower. According to the method, by combining the water flow velocity of the riverway, the scouring of the shoreside spillway tunnel to the riverway during operation is estimated, and reference is provided for operation scheduling of the shoreside spillway tunnel and protection of the downstream riverway; the method mainly comprises the following steps: according to parameters such as a flip bucket flow velocity and an upstream and downstream water level difference, calculating a flip water tongue water entry flow velocity, and calculating a characteristic thickness when a water tongue enters water; calculating the running time of the jet water tongue in the downstream water body according to the water inlet flow velocity of the water tongue and the characteristic thickness, and considering the additional displacement of the river water flow velocity effect;