Ⅱ、桥墩局部冲刷计算在河道中修建桥墩后,桥墩对水流的阻碍,引起桥墩周围水流结构的剧烈变化,在墩头前缘形成一种“下降水流”,垂直向下,猛烈冲刷床面泥沙,在墩前冲刷形成一个漏斗形的冲刷坑,称为桥墩局部冲刷。由床面起算的冲刷坑最大深度,称为桥墩局部冲刷深度。 Ⅱ. Local scouring of piers After the pier was built in the river, the pier obstructs the water flow and causes drastic changes of the water flow structure around the pier. A “falling current” is formed at the front of the pier and vertically downward and violently scour the bed of mud Sand, washed in front of the pier forming a funnel-shaped scour pit, known as the pier scouring. The maximum depth of scour pit from the bed, known as the pier partial scour depth.