Lifting type foundation scouring monitoring device and method

The invention discloses a lifting type foundation scouring monitoring device which comprises a lifting lead screw installed on the side wall of a bridge pier, a sliding seat in threaded connection with the lifting lead screw, a sealing cover installed on the sliding seat, a monitoring assembly and an illumination assembly installed in the sealing cover, a transmission box installed on the side wall of the bridge pier, and a water wheel rotationally connected to the bottom end of the transmission box through a water wheel shaft. The transmission case is used for converting rotation of the water wheel caused by water flow into lifting motion of the sealing cover. A lifting type foundation scouring monitoring method comprises the steps that an original image is monitored and recorded; the sensor senses the rotation turns of the water wheel and transmits the rotation turns to the memory; when the number of rotation turns exceeds a preset alarm value, an alarm signal is sent out; and comparing the original image w