Author:
Yuan Y,Zhao J Q,Xie W,Luo P A
Abstract
Abstract
The flow pattern of the water with vegetation is complex. For the micro-bend channel which has compound cross-sections and has vegetation on the slope, the situation is more complex. This paper measures and analyses the hydraulic characteristics of the micro-bend channel with trapezoidal cross-sections and with vegetation on the slope,by using the ACM2-RS electromagnetic flow meter. The influence of vegetation structure changes on the hydraulic characteristics are further analysed, which includes flow velocity distribution, turbulence intensity and channel roughness. Studies have shown that, with the decrease of the rigidity of vegetation density, the sinuosity of the hydrodynamic axis increases, the longitudinal velocity of each section in the main channel has an obvious trend of decrease. Besides, the longitudinal and lateral turbulence intensity keeps constant in the main channel, have obvious decreasing trends on the slopes. In addition, river manning roughness coefficient increases with the increase of rigid vegetation density.