Experimental study on the local scour around tandem square porous piles in steady current has been carried out in the live-bed flow condition. The influence of the porosity (P) of both front and rear piles in the tandem configuration (P = 0–38.5 %) and the gap ratios (G/D = 2–12) are quantified based on the measurement of the development of the local scour, time scale, three-dimensional scour profiles and the scour characteristics were analysed. Three regimes are identified regarding on the porosity distributions of the front and rear pile. The distinct features were found at the porosity of the front was small than its counterpart of the rear. The global scour can be recognized at G/D < 4. The dimensions of the scour hole for the rear pile decrease first as a trade-off is observed between the sediment deposit landed around the rear pile and its weak erosion. A critical gap ratio, at which the minimum scour dimensions were observed is strongly depend on the difference of the porosity between the front and rear piles.

开展了活床流动条件下稳流串联方形多孔桩周围局部冲刷的试验研究。前后桩的孔隙率（P）在串联配置（P  = 0-38.5 %）和间隙比（G / D  = 2-12）的影响是基于对发展的测量进行量化的分析了局部冲刷、时间尺度、三维冲刷剖面和冲刷特性。关于前后桩的孔隙度分布，确定了三种制度。在前部的孔隙率上发现的明显特征比后部的孔隙率小。可以在G/D识别全局搜索 < 4. 后桩冲刷孔的尺寸首先减小，这是在后桩周围沉积的沉积物与其弱侵蚀之间观察到的权衡。观察到最小冲刷尺寸的临界间隙比很大程度上取决于前后桩之间的孔隙率差异。