Pile groups are important hydraulic structures and scouring around them is not only affected by the flow characteristics but also by the number and arrangement of piles in a group. This research experimentally investigates the temporal scouring around pile groups subjected to single peak hydrographs in clear-water conditions. Results show that the scouring depths around rear piles downstream of the lead could be decreased during the hydrographs by up to 24% of the pile diameter, and that the final scour depth is different from the maximum scour depth. This backfilling process is originated from washing the deposition zones to the downstream piles during the falling limb and affected by the hydrograph unsteadiness properties.

桩群是重要的水工建筑物，其周围的冲刷不仅受水流特性的影响，还受到群内桩的数量和排列的影响。本研究通过实验研究了在清水条件下受单峰水位线影响的桩群周围的时间冲刷。结果表明，在水文过程中，引线下游后桩周围的冲刷深度最多可减少桩直径的 24%，并且最终冲刷深度与最大冲刷深度不同。这种回填过程源于在下肢过程中将沉积区冲洗到下游桩，并受水文过程图的不稳定性影响。