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桥下河槽冲刷是一个复杂问题,它主要包括:河床演变,天然冲刷,桥下一般冲刷与墩台局部冲刷。其中河床演变是指河床在长期的发展过程中,逐年下降或淤高所引起的河床变形;天然冲刷是指建桥前洪水时期,由于深泓的摆动,水流的集中所产生的河槽冲刷;桥下一般冲刷是指建桥后,由于桥梁压缩水流而引起的河槽冲刷;墩台局部
River channel erosion under the bridge is a complex issue, which mainly includes: riverbed evolution, natural scouring, general scouring under the bridge and partial scouring of piers. Among them, the river bed evolution refers to the riverbed deformation caused by the year-by-year decline or siltation of the riverbed in the course of long-term development. The natural erosion refers to the river channel erosion caused by the swinging of the water stream during the flood period before the bridge construction. Under the general erosion refers to the bridge after the bridge due to compressed water flow caused by erosion of the river channel; piers local