When G is -0.5, 0, 0.5 and 1, the pipe is exposed on the bed surface. After scouring, the depth of the scouring pit at the bottom of the pipeline is 4.7cm, 4.2cm, 3.5cm, and 1.6cm in sequence, and the entire bed surface drops by about 1cm.
When G is -0.5, 0, 0.5 and 1 respectively, the pipe is exposed to the bed. After flushing, the depth of the bottom of the pipe flushing pit is 4.7cm, 4.2cm, 3.5cm, 1.6cm, and the overall bed surface decreases by about 1cm.
When G is - 0.5, 0, 0.5 and 1, the pipeline is exposed to the bed surface. After scouring, the depth of scour pit at the bottom of the pipeline is 4.7cm, 4.2cm, 3.5cm and 1.6cm, and the bed surface drops about 1cm.