In this study, by changing both pier diameters and particle sizes of sand bed in flume experiments, the scour process around cylindrical bridge piers under an ice-covered flow condition has been investigated. It is found that the appearance of an ice cover on the water surface caused a deeper and wider scour hole in comparison with that in an open flow with identical flow rates, implying a larger volume of scour hole under an ice-covered flow condition. Similar to the scouring process at a bridge pier under an open flow condition, both the depth and volume of a scour hole increase with the flow velocity and pier diameter. Comparing with results under an open flow condition, for identical flow rates, the maximum depth of a scour hole under an ice-covered flow condition increased by about 20%–30%, and both the scour area and volume of a scour hole increased by about 40%–50%. A flow at Froude number of 0.15 is the demarcation point for assessing an obvious impact of an ice cover on the local scour around a bridge pier in this experimental study. Using data collected from laboratory experiments, equations have been developed to calculate the maximum scour depth, scour area and scour volume. Results of present study have been compared with those of others.

在这项研究中，通过改变水槽实验中的墩直径和沙床粒径，研究了冰覆盖流动条件下圆柱桥墩周围的冲刷过程。研究发现，与相同流速的开放流相比，水面上冰盖的出现导致了更深和更宽的冲刷孔，这意味着在冰盖流条件下冲刷孔的体积更大。与桥墩在明流条件下的冲刷过程类似，冲刷孔的深度和体积都随着流速和桥墩直径的增加而增加。与开流条件下的结果相比，对于相同的流速，冰覆盖流条件下冲刷孔的最大深度增加了约20%~30%，冲刷孔的冲刷面积和体积均增加了约40%~50%。在本实验研究中，弗劳德数为 0.15 的流量是评估冰盖对桥墩周围局部冲刷的明显影响的分界点。使用从实验室实验收集的数据，已经开发出计算最大冲刷深度、冲刷面积和冲刷体积的方程式。本研究结果与其他研究结果进行了比较。