不同密度滩地植被作用下的复式河槽水流特性

The Characteristic of Two-Stage Flow with Different Densities of Floodplain Vegetation

利用刚性竹签模拟非淹没滩地植被,在非对称复式河槽中进行了不同滩地植被密度作用下的水流特性系列试验。结果表明:主槽中心流速符合对数分布,滩地中心流速沿垂向垂直向上分布;主槽和滩地中心垂线平均流速受植被密度影响,垂线平均流速增长率与植被密度呈线性关系;主槽中心横向和纵向的紊动强度均呈S形分布,滩地中心处3个方向的紊动强度均不呈S形分布。

Series of trials had been conducted in asymmetrical compound channel with different densities of floodplain vegetation which was stimulated by rigid sticks.The results indicate that the velocity distribution in the centerline of main channel follows a logarithmic distribution and the velocity distribution in the floodplain centerline follows a vertical distribution;the velocity distribution affected by the densities of floodplain vegetation,there is a linear relationship between velocity increasing rate and vegetation density;the lateral and vertical turbulent distributions in the main channel centerline follow S shape,but three directions of that do not follow in floodplain centerline.