bed roughness

At the same time the sensitivity of bed roughness was calculated due to the coefficient of local head loss with this program and it was found that the coefficient of local head loss has great influence on bed roughness.

同时，也利用本程序计算分析了局部水头损失系数对糙率的敏感度，提出局部水头损失对糙率也有很大的影响。

On the basis of freeboard phenomenon in curve way and the improvement of curve flow velocity, this paper gets a useful calculating method of bed roughness.

本文基于弯道超高现象以及弯道流速计算的改进，得出了一种较为实用的泥石流沟床糙率计算方法。

In this paper, the influences of downstream depth, bed roughness and accumulation of dumped stones on the flow in vertical closure are studied.

本文从龙口下游水力条件出发，探讨下游水深、河床糙率以及抛料堆积体对立堵规律的影响。

Building low dam diversion pivot on the river that of gradient ratio steep> bed material roughness and bed load movement acuteness is characteristic in Southwest medium size water power station.

在大比降、河床质很粗、推移质运动剧烈的河流上修建低坝引水枢钮，是我国西南地区中型水电站的特点。

The resistance of surface flow has a reverse relation with Reynolds number. With the same Reynolds number, the resistance coefficient of surface flow is greater than that of laminar flow in open channel and increases with increased bed roughness.

坡面水流阻力与雷诺数的呈反比关系，相同雷诺数条件下，阻力系数比明渠层流阻力系数要大，且随床面粗糙度的增加而增大。

The concept "aerodynamic roughness length" defined by Bagnold is an important parameter for wind erosion research. It has been widely applied in sand bed, vegetation conditions, snow bed and water surface.

由Bagnold提出的空气动力学粗糙度概念，是描述各种表面空气动力学特征的重要参数，已被广泛应用于沙面、植被覆盖表面、雪面、水面等。

Bed surface roughness and bursting phenomena in open channel

表面糙率与明渠紊流猝发现象

Based on Bed Roughness Inversion Reservoir Warehousing Discharge Measurement and Model Experiment

基于河床糙率反演的水库入库流量测定与模型试验

Reynolds Number and Froude number of overland flow tend to diminish, water flow velocity tends to diminish, and resistance coefficient tends to increases as bed surface roughness increases in the condition of same slope gradient and flow discharge.

在坡度和流量相同情况下，随着坡面粗糙度增加，坡面流雷诺数和佛汝德数均呈减小趋势；

The relationships for hydro-dynamic parameters ( Reynolds number, Froude number, resistance coefficient and flow velocity) of overland flow as a function of bed roughness, flow discharge and slope gradient were simulated by means of indoor fixed-bed resistance experiments.

在室内试验的基础上，采用定床阻力试验研究了坡面流水力学参数（雷诺数、佛汝德数、阻力系数和流速）随床面糙率、流量和坡度的变化规律。

An analysis of the bed roughness in Shandong reaches of the Yellow River

黄河山东段河床糙率分析

The amount of the departure may not necessarily be large, but it results in the larger errors when the profiles are used to calculate the bed roughness length and shear stress.

虽然偏离值可能不大，但利用对数剖面去计算河底粗糙长度和剪切应力时会引起较大的误差。

A calculating method for bed roughness based on debris flow velocity in curve

基于泥石流弯道流速的沟床糙率计算

The results reveal that the sectional velocity distribution deviates from the logarithmic law in the core flow area. Meanwhile, the influence of roughness ratio of ice-cover bottom to bed, bed relative roughness and Reynold number on velocity distribution pattern is indicated.

研究结果表明，冰盖下水流的纵向流速在流动核心区并不遵循对数分布规律，同时揭示了冰盖底部与河床的相对粗糙比、河床相对粗糙度及雷诺数对流速分布规律的影响。