Suspended vegetation in open channels such as natural river,lake,reservoir usually affect the flow structure,causing the change of the water environment,sediment transport,bed deformation.In order to study the water flow behavior in curved open channels under the influence of suspended vegetation,experiments were conducted in a U-shaped flume with 180° bend where the suspended vegetation substituted by cylindrical glass rods were partially placed.The particle image velocimeter(PIV)system was employed to measure the flow velocities of various cases with different vegetation arrangements and roots length.Comparison and analysis were conducted for measured data,such as water level,velocity,head loss,Reynolds stress,and turbulence kinetic energy(TKE)to obtain certain general rules of water flow in open curved channels with suspended vegetation.It can be found from the measured data that the water level and the head loss in the vegetation area are closely related to the arrangements of the suspended vegetation.Furthermore,the drag force of the vegetation can not only lead to smaller increments of longitudinal TKE above the vegetation tail than that below it,but also lead to the flow velocities in vegetation area much smaller than areas without vegetation.In addition,suspended vegetation weakens the vortex strength near the water surface and increases the vortex strength below the vegetation tail,and the flow velocity in the vegetation area has a close relationship with the suspended vegetation length in the water.Therefore,it can be concluded that the reasonable arrangements of suspended vegetation group in curved open channel can protect the concave bank from being scoured,and protect the convex bank from being deposited.

ZHANG Qiao-ling;JING He-fang;LI Chun-guang;WANG Wei-hong;ZHANG Wen-sheng

School of Mathematics and Information Science,North Minzu University,Yinchuan 750021,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China

山地科学学报（英文版）

[1]ZHANG Qiao-ling;JING He-fang;LI Chun-guang;WANG Wei-hong;ZHANG Wen-sheng-.Flow characteristics in curved open channel with partial suspended vegetation)[J].山地科学学报（英文版）,2022(09):2715-2728

scoured

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