This study explores the characteristics of the spectral shortcut in the turbulence kinetic energy transfer in experimental open channel flows with the presence of submerged vegetation flow. The vegetation layer was simulated by arrays of rigid vertical cylinders, distributed uniformly in the channel bed. Results indicate that there are dual inertial subranges (ISRs) in the spectral distribution of turbulence energy in the penetration layer, where the Kelvin-Helmholtz (KH) and wake vortices coexist. The lower-frequency and higher-frequency ISRs reflect the energy cascading of the KH and wake-scale vortices, respectively. Spectral shortcut narrows the ISR for the KH vortex and contributes to the ISR for the wake-scale vortices, because such an action transfers a significant amount of turbulent energy directly from the large-scale eddies to the wake-scale vortices. We study the influence of spectral shortcut on energy transfer according to the turbulence kinetic energy budget equation for shear turbulence. The transferred energy is found to account for 58–71% of the shear turbulent energy and contributes considerably to the wake-scale turbulence. The strength of the energy transfer increases with the increase in the vegetation density and the mean bulk velocity and the decrease in the relative submergence.

本研究探讨了在存在淹没植被流的情况下，实验性明渠水流湍流动能传递中谱捷径的特征。植被层由刚性垂直圆柱体阵列模拟，均匀分布在河床层中。结果表明，在穿透层湍流能量的频谱分布中存在双惯性子范围（ISR），开尔文-亥姆霍兹（KH）和尾流涡流共存。较低频率和较高频率的ISR分别反映了KH和尾波涡旋的能量级联。光谱捷径可缩小KH涡旋的ISR，并有助于尾波涡旋的ISR，因为这样的动作将大量的湍流能量直接从大型涡流转移到了尾流涡流。我们根据剪切湍流的湍动能预算方程研究了谱捷径对能量传递的影响。发现传递的能量占剪切湍流能量的58-71％，并且对尾流湍流有很大贡献。能量传递的强度随着植被密度和平均体速度的增加以及相对淹没的减少而增加。发现传递的能量占剪切湍流能量的58-71％，并且对尾流湍流有很大贡献。能量传递的强度随着植被密度和平均体速度的增加以及相对淹没的减少而增加。发现传递的能量占剪切湍流能量的58-71％，并且对尾流湍流有很大贡献。能量传递的强度随着植被密度和平均体速度的增加以及相对淹没的减少而增加。