Abstract: The multi-scale turbulent structures enable understanding the vegetation patch-affected sediment transport and riverbed evolution. Here, flume-based wake flow characteristics were analysed under different aspect ratios and vegetation densities. The mean flow velocity and Reynolds stress distribution were obtained. The fluctuation field was analysed using the spectral proper orthogonal decomposition to obtain different scale eddies' spatial modes and energy distribution. We demonstrate the following: ① The shear strength and non-dimensional shear layer thickness increased with the vegetation density and decreased with increasing canopy shear layer aspect ratio. ② The wake flow large-scale eddies exhibited a 0.15—0.29 Hz frequency and 0.16—0.32 Strouhal number (Sr). The eddies exhibited 0.2—1.3 times higher vertical distribution than the vegetation and 2—6 times wider longitudinal distribution than the patch diameter. The eddies exhibited transverse distribution from the vegetation centreline. ③ The wake region longitudinal outflow velocity and turbulence intensity affected the stable wake region length. The longitudinal outflow velocity and turbulence intensity determined the shear layer longitudinal transportation and vertical diffusion velocities, respectively.