The local sediment motion around cylindrical structures laid on erodible seabed occurs with wave and/or current effects and causes significant stability problems. In this study, the development of the scour hole along the spanwise direction of the pipeline and the scour propagation velocity were investigated experimentally. The time dependent measurements beneath the test pipe were performed in a large wave channel. In the experiments, the measurements were recorded by using ultrasonic equipment. Since the coarse bed materials were used, all of the experiments were carried out in the clear-water scour regime condition, differently than live-bed data in literature. The experimental results reveal that the scour propagation along the spanwise direction of the submarine pipe is not relevant with Shields parameter under clear-water condition; however, it is inversely related to the Keulegan-Carpenter number. By analyzing the findings of the study, a new empirical relation was established to estimate the non-dimensional scour propagation velocity based on the Keulegan-Carpenter number along the spanwise direction of submarine pipe, in case of wave effect. The statistical significance of the equation was demonstrated by the correlation coefficient and scatter index.

位于可侵蚀海床上的圆柱形结构周围的局部沉积物运动伴随着波浪和/或电流的影响而发生，并导致严重的稳定性问题。在这项研究中，冲刷孔沿管道展向方向的发展和冲刷传播速度进行了实验研究。测试管下方的时间相关测量是在大波通道中进行的。在实验中，使用超声波设备记录测量结果。由于使用了粗床材料，所有的实验都是在清水冲刷条件下进行的，与文献中的活床数据不同。实验结果表明，在清水条件下，沿海底管道展向方向的冲刷传播与Shields参数无关；然而，它与 Keulegan-Carpenter 数成反比。通过对研究结果的分析，在波浪效应的情况下，建立了一种新的经验关系，以估计沿海底管道展向方向的Keulegan-Carpenter数的无量纲冲刷传播速度。方程的统计显着性由相关系数和散布指数证明。