Experimental investigation of channel flow through rigid roughness elements with different shapes

Mean velocity was measured using a 3D micro ADV, collected at each experiment point for 2min with a sampling frequency of 25 Hz. The utilized ADV, which has a forward-looking probe, was mounted on a movable platform over the flume and was able to move in the longitudinal and transverse directions. The vertical adjustment of the device was set according to a custom-made positioning system.研究采用三维微型声学多普勒流速仪（3D micro ADV）测量平均流速，在每个实验测点的采集时长为2分钟，采样频率为25赫兹。本次实验所用的ADV配备前视探头，安装于水槽上方的可移动平台上，可沿纵向与横向方向移动。该设备的垂直调节功能依托定制定位系统完成设置。