冰盖条件下桥墩局部冲刷研究进展

冬季，寒冷地区的河流会出现冰盖或冰塞现象。冰盖的存在使水流湿周增加，流速剖面与明流条件下完全不同，最大流速出现在河床表面和冰盖底部之间，具体位置取决于河床和冰盖的相对粗糙程度。因此，冰盖条件下桥墩局部冲刷过程不同于明流条件下的局部冲刷过程。明流条件下的桥墩局部冲刷是国内外学者研究的热点问题之一，但关于冰盖条件下桥墩局部冲刷的研究工作却非常有限。在简要回顾明流条件下桥墩局部冲刷研究成果的基础上，对冰盖条件下桥墩局部冲刷的研究成果进行了综述和讨论，并提出了今后的研究方向。

Advances in research work regarding local scour around bridge piers/abutments under ice-covered flow condition

In winter, ice cover or ice jam present in many rivers in cold regions due to decrease in temperature. The presence of ice cover/ice jam imposes a solid boundary to flow. The velocity profile under ice-covered condition is totally different compared to open channel flow. Under ice-covered condition, the maximum velocity occurs between channel bed and the bottom of the ice cover and is dependent on the relative roughness of these two boundaries. Thus, the local scour process around bridge piers/abutments under ice-covered condition differs from that under open channel flow condition, which has been investigated by many researchers. However, limited research work regarding local scour process around bridge piers/abutments under ice-covered condition has been reported. In this paper, research results regarding local scour process around bridge piers/abutments under ice-covered flow condition have been reviewed and compared. Analysis and discussions of the reported results have been conducted. Future research topics regarding this topic have been proposed.