植草河床的垂线流速分布规律试验研究  

Experimental study on vertical velocity distribution in grassy riverbed

作　　者：鲁薇 LU Wei

机构地区：[1]朝阳市水务局,辽宁朝阳122000

出　　处：《东北水利水电》2021年第7期16-18,71,共4页Water Resources & Hydropower of Northeast China

摘　　要：为分析植草河床的流速垂线分布规律,本文采用室内物理模型和原体天然植物相结合的试验方法,选取东北地区河道滩地常见植被高羊茅,对3种不同流量、2种不同植物密度、3种不同植物高度,共21组工况进行试验分析。试验表明,含植物河床水流垂线流速分布大致呈倒“S”型,按照拐点的分布规律,将垂线流速沿水深分为3个区域,即植物淹没区、过渡区和植物淹没以上区。植物淹没区的垂线流速变化范围较小,过渡区的流速梯度很大,植物淹没以上区逐渐恢复对数分布规律。In order to analyze the vertical velocity distribution of the grass riverbed.This paper adopts the experimental method of combining the indoor physical model with the natural plant,and selects the common vegetation festuca arundinacea in the river beach of Northeast China,and carries out the experimental analysis on three different flows,two different plant densities,three different plant heights,a total of 21 working conditions.The vertical velocity of the grass riverbed is distributed roughly in an inverted“S”shape,and according to the distribution of the inflection point,the vertical velocity along the water depth is divided into three regions,namely the plant flooded zone,the transition zone and the zone above submerged plants.The vertical velocity of the plant flooded zone varies slightly,the velocity gradient in the transition zone is large,and the vertical velocity in the zone above the submerged plants gradually restores to a logarithm distribution rule.

关 键 词：垂线流速分布 植草河床 模型试验 

分 类 号：P332.4[天文地球—水文科学]