1) roughed wind speed
摩阻速度
1.
8) for the wind speed flow chart and it systematically analyses the benefit of wind-breaking and sand-binding of salix deserts barrier with roughness length and roughed wind speed.
0)软件作出沙障体系内外的风速流场图,并运用粗糙度(z0)、摩阻速度(u*)等物理参数,对复式沙柳沙障的防风效益和阻沙作用进行了系统研究。
2) friction velocity
摩阻流速
1.
Experimental analysis on influence from sudden change of roughness of open channel bottom on friction velocity of turbulent flow and wall shear stress;
明渠渠底糙率突变对紊流摩阻流速及壁面切应力影响的试验分析
2.
Experimental study on friction velocity and velocity profile of open channel flow;
明渠均匀流的摩阻流速及流速分布
3.
Based on the principle that the bed shear stress and friction velocity of the grass cover in the model should equal those of actual condition in which grass cover is destroyed due to scouring,an experimental equipment was designed to simulate the scouring flow with high velocity in actual rivers and to measure the hydraulic parameters during the scouring process.
基于模型和原体草皮冲刷破坏时床面切应力和摩阻流速应该相等原理,研制了一套可用于模拟实际河道中的大流速冲刷水流,并测定冲刷过程中植被水力学参数的试验装置。
3) shear velocity
摩阻流速
1.
Calculation methods of shear velocity in open gravel channel;
卵砾石河道摩阻流速计算方法探讨
2.
An improved theory is developed to illuminate distributing density of arbitrary shaped roughness elements on a wall and how wind velocity above the turbulent boundary layer in?uences shear velocity.
从学术观点和方法上将研究边界层流动对粗糙壁面的摩擦切应力与研究均匀沙流体起动风速统一了起来;;既关心了布满均匀沙的沙床上颗粒的流体起动风;;又关心了稀疏分布着均匀颗粒的光滑地表上沙子的流体起动风速;;得出了用边界层外参考风速表示的流体起动风速随颗粒分布密度的增加呈指数增长规律;;而用摩阻流速表示的流体起动风速与颗粒分布密度的二分之一次方成正比的规律;;与有关实验数据取得一致。
3.
Three hydraulic parameters of shear velocity (u*), roughness length (z0) and bed shear stress(τ0) in natural river flow are derived from logarithmic flow velocity profiles by fitting a straight line by ordinary least squares regression to the profile.
根据天然河流对数流速分布公式,采用最小二乘法建立流速u依水深的对数lnz 的线性回归方程以估计底部摩阻流速u*、粗糙长度z0和底部切应力τ0这三个水力学参数,并给出了估计其误差的数理统计方法。
5) shear velocity
摩阻速率
1.
It is concluded that aerodynamic roughness length and shear velocity are well correlated to vegetation coverage.
结果表明,临界侵蚀风速与植被盖度之间、风速与土壤风蚀发生的临界植被盖度之间均为非线性正相关关系;植被盖度与空气动力学粗糙度、摩阻速率之间具有良好的相关性;植被覆盖条件下空气动力学粗糙度和摩阻速率的增大对土壤风蚀具有显著的影响。
2.
The results indicated that the anti-wind erosion influence of ground surface soil increases under the condition that aerodynamic roughness length increases exponentially and shear velocity increases according to quadratic curve with vegetation coverage increasing.
结果表明,空气动力学粗糙度随植被盖度的增加呈指数增加,摩阻速率随植被覆盖呈二次曲线增加,使地表土壤的抗风蚀作用增强;风蚀量随植被盖度的增加呈指数减少,植被盖度大于30%时,其防风蚀效应显著。
6) frictional depth
摩阻厚度
补充资料：环空摩阻
分子式：
CAS号：
性质：又称环空摩耗或环空摩阻。在环形空间部分发生的压力损失。
CAS号：
性质：又称环空摩耗或环空摩阻。在环形空间部分发生的压力损失。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条