A staggered distribution of vegetation is very common in nature, which might significantly affect the flow structure. To investigate its impact, three rows of staggered vegetation groups are designed under seven different working conditions. The horizontal and vertical distances between the vegetation groups are constant, while the vegetation density is variable. The flow field is measured by the acoustic Doppler velocimeter (ADV). It is indicated that both the patch exit velocity and the steady wake velocity decrease with the increase of the density, which is also related to the vegetation rows. Except for the first patch, the upstream adjustment regions of all patches are diminished to some extent, due to the effect of the contralateral patch. The steady wake region also shows a decreasing trend, with a reduction of 0.5D each time when the water flows through the patch. This means that the flow structure is also affected by the number of vegetation rows. The intensity of the turbulence increases along the channel and has a non-axisymmetric distribution similar to that of the velocity. The Karman vortex street generated by the patches on the same side would merge into a larger vortex street. Depending on its intensity, the vegetation at the back has different effects on the vortex street.

植被交错分布在自然界中很常见，这可能会显着影响水流结构。为了研究其影响，在七种不同的工作条件下设计了三排交错的植被群。植被群之间的水平和垂直距离是恒定的，而植被密度是可变的。流场由声学多普勒测速仪 (ADV) 测量。表明斑块出口速度和稳定尾流速度都随着密度的增加而减小，这也与植被行数有关。除第一个贴片外，由于对侧贴片的影响，所有贴片的上游调整区域都有一定程度的缩小。稳定尾流区也呈现下降趋势，下降了 0.5 D每次当水流过贴片时。这意味着流结构也受植被行数的影响。湍流强度沿通道增加，并具有与速度相似的非轴对称分布。由同一侧的补丁产生的卡门涡街将合并成一个更大的涡街。根据它的强度，后面的植被对涡街有不同的影响。