The presence of submerged plants increased the flow gradient, hence the bed roughness became larger to resist flow.
淹没植物的存在起阻流作用，增大了水流的坡降，使床面糙率变大。
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。
The bed roughness height was expressed by the corrective height of vegetations, and the non-uniformity roughness was expressed by the variance of the height.
以植物高度表示有植物床面的粗糙突起程度，以高度的方差表示粗糙度的非均匀性。
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。
The experiment results show that the threshold velocity is affected by the ratio of roughness coefficient of ice cover and bed.
试验表明：冰盖下泥沙起动流速与冰盖及槽底糙率的相对比值有关。
From road bed (way trough), storey of the cushion, basic unit, to the road surface, every storey hast regulate the roughness.
从路基(路槽)、垫层、基层、到路面面层，每一层都必须控制平整度。
Preparatory test results of the test-bed are presented, which include machined straight slots, circles, thin walls and human faces, and measured surface roughness at the bottom of the slot.
给出了初步的试验结果，包括加工的直槽、圆、薄壁和人脸，以及槽底的表面粗糙度。
The turbulence coefficient and permeability is re lated with the grain size, sphericity and roughness of the proppant, and the porosity of the proppant-filling bed, and the experimental conditions.
紊流系数和渗透率与支撑剂粒度、球度、圆度、支撑剂充填层孔隙度和实验条件等有关。
It is revealed that the roughness factor, slope of the canal bed, cross section of the canal and sediment sizes are the important factors which influence the sediment transport capacity of the canal.
渠道的糙率、比降、断面形状、来沙组成和引水流量是影响引黄渠道挟沙能力的主要因素；
It is revealed that the roughness factor, slope of the canal bed, cross section of the canal and sediment sizes are the important factors which influence the sediment transport capacity of the canal.
渠道的糙率、比降、断面形状、来沙组成和引水流量是影响引黄渠道挟沙能力的主要因素；
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