【作者】 史学伟； 王丹； 焦军丽； 李文奇； 杨克君； 彭清娥；

【Author】 SHI Xuewei;WANG Dan;JIAO Junli;LI Wenqi;YANG Kejun;PENG Qing’e;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University;

【机构】 四川大学水力学与山区河流开发保护国家重点实验室；

【摘要】 天然河道中的含植被水流大多是充分发展的紊流,明渠中植被的存在不仅对流速场会造成影响,也会导致紊流场发生改变。本文通过水槽试验研究了非淹没刚性植被群直径的大小对紊动强度分布的影响,采用竹签概化模拟圆形植被群落,设计了四组直径的植被群。试验表明,在植被群下游,当植被群直径较小时,紊动能垂向分布形态呈折线状,有两个拐点,随着植被群直径的增加,拐点逐渐减少甚至消失;紊动能横向分布形态不受植被群直径影响,都呈波峰状;植被群直径对紊动强度纵向分布的整体形态无影响。更多还原

【Abstract】 Most of the vegetation-containing water in the natural river is a fully developed turbulence.The existence of vegetation in open channel can not only affect the velocity field,but also change the turbulence field.In this paper,the influence of the diameter of non-submerged rigid vegetation group on the distribution of turbulence intensity was studied by sink test.The four groups of vegetation groups were designed by using bamboo sticks to simulate the circular vegetation community.The results show that when the diameter of the vegetation group is small,the vertical distribution of the turbulent energy is linear and has two inflection points.With the increase of the diameter of the vegetation group,the inflection point gradually decreases or disappears.The diameter of the vegetation group had no effect on the overall shape of the longitudinal distribution of the turbulence intensity.更多还原