摘要：Aquatic flexible submerged vegetation widely exists in natural rivers, lakes and beaches. which has a significant impact on flow structure and flow ca- pacity of rivers, and plays an important role in eco- logical restoration. Therefore, it is very important to study the flow characteristics of open channel with vegetation. In this paper, the model plastic grass is used to replace the flexible submerged vegetation in natural river. Through the indoor high-precision flume test, three dimensional acoustic Doppler ve- locimeter was used to measure the flow characteris- tics of different forms of flexible submerged vegeta- tion. The distribution characteristics of flow velocity. turbulence intensity and Reynolds stress quadrant variation rule of flexible submerged vegetation are obtained. The results show that the longitudinal time-average velocity decreases with the increase of flow rate along the way, and is less affected by veg- etation morphology; along the course turbulence in- tensity increases with the increase of flow, and in- reases obviously with the increase of vegetation width to height ratio; the longitudinal velocity de- creases with the increase of vegetation width to height ratio along the water depth; the contribution value of vegetation morphology to Reynolds stress in each quadrant is different, and the width of flexi- ble submerged vegetation is larger. When the height is large, it can effectively restrain the scour of the riverbed and maintain the stability of the riverbed.
