ISWC OpenIR  > 水保所知识产出(1956---)
坡面植被水流水动力学特性研究
高延良1; 董旭1; 杨帆1; 张宽地1,2
2016
Source Publication水力发电学报
Volume35Issue:9Pages:38-47
Abstract

本实验为人工水草模拟植被覆盖条件下的坡面流水动力学特性研究,以水力学和流体力学基本理论为依
据,通过室内定床阻力模拟放水实验,定量的研究了植被覆盖度为9.3%(2500 簇/m2)的工况下,不同坡度和流
量组合对植被水流各水动力学参数的影响。结果表明:坡面植被水流平均流速随坡度和流量的增大呈递增趋势,
可用线性函数或幂函数关系模拟,且线性关系优于幂函数关系;植被坡面流平均水深与流量和坡度之间也存在着
显著的线性关系和幂函数关系;植被坡面流的佛汝德数随流量的增加而减小、随坡度的增加而增大,并呈现出一
定的幂函数关系,但佛汝德数主要受坡度的控制,流量对佛汝德数的影响很小;阻力系数随雷诺数的变化规律呈
单驼峰形式,本实验条件下,在雷诺数为1500 ~ 2000 时达到最大值,当雷诺数大于2000 时,随雷诺数的增加阻
力系数反而减小,最后逐渐趋于稳定,可见两者之间并非呈简单的递增或递减关系。

Other Abstract

This experiment has been conducted to study hydraulic characteristics of overland flows on a
fixed bed laboratory model with simulated vegetation cover of 9.3%, along with an analysis on variations
of hydraulic parameters of overland flows under different discharges and different bed slopes using the
theories of fluid mechanics and hydraulics. Measurements show that average velocity of water flow on
the vegetation slope increases with bed slope and flow rate, and that the relationship can be expressed by
either a linear or power function, but with the linear one superior. These two functions can also well fit
the relationship of water depth versus bed slope and flow rate. Froude number of the vegetation slope
water flow decreases with the increasing flow rate but increases with bed slope, following a power
function, but its variation is evidently dominated by bed slope and much less dependent on flow rate.
Resistance coefficient of the flows varies in a hump shape, reaching its peak in the Reynolds number
range of 1500 to 2000. In the range beyond 2000, it is decreasing inversely with Reynolds number and
then gradually approaching a stable value. Thus, the relationship of resistance coefficient versus Reynolds
number is not monotonic.

Keyword工程水力学 坡面流 植被覆盖 水动力学特性 阻力系数
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8754
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学水利与建筑工程学院
2.中科院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国 家重点实验室
Recommended Citation
GB/T 7714
高延良,董旭,杨帆,等. 坡面植被水流水动力学特性研究[J]. 水力发电学报,2016,35(9):38-47.
APA 高延良,董旭,杨帆,&张宽地.(2016).坡面植被水流水动力学特性研究.水力发电学报,35(9),38-47.
MLA 高延良,et al."坡面植被水流水动力学特性研究".水力发电学报 35.9(2016):38-47.
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