wind shear

According to the FNL ( Final Analysis) data, the cold front was found to have a typical horizontal and vertical structure with a maximum temperature gradient and obvious wind shear.

FNL资料分析表明，在锋区内存在1个较大的水平温度梯度带，水平风切变明显。

The widely accepted Bagnold type function to calculate threshold wind velocity or shear velocity was developed for dry sands.

在土壤风蚀研究中，Bagnold建立的干沙子的起动风速与沙粒粒径关系的表达式已被广泛接受。

In either case, there will be in high-altitude wind shear.

无论在哪种情况下, 高空中都会有风切变.

Low-level Wind Shear Detection Algorithm Based on Prony Model

基于Prony模型的低空风切变快速检测算法

The product of vertical wind profile ( VWP) which based on VAD methods are introduced detailedly. This product is useful to ascertain the type of thermal advection, the shear of vertical wind, etc.

详细介绍了基于VAD技术的垂直风廓线产品（VWP）的应用技术，此产品对确定热力平流类型、垂直风切变等都是有用的。

It is shown that a propagating eastward Rossby wave may be induced by the easterly wind shear.

发现由于东风切变的存在，可以产生自西向东传播的Rossby波。

It comes on with some mesoscale system, such as mesoscale convergence line wind shear, gale area and so on.

强对流天气在速度场上表现为中尺度辐合线、风向风速辐合区、风速辐合区、大风区等中尺度系统。

The evolution and characteristics of gravity waves excited by a temporal and spatial Gaussian-varying thermal source, and their interactions with wind shear are studied.

研究了剪切风场中，随时空高斯分布的宽谱热源激发重力波的详细过程及其特性，以及激发波与剪切风场的相互作用。

Based on the linearized equations of longitudinal motion, containing the wind shear terms, the optimal control problem with infinite time quadratic performance index as well as the reversal problem are investigated.

列出了有风切变时飞机的纵向运动方程及其线化形式，以此为出发点探讨了基于无限时域二次型佳能指标的最优控制问题及其逆问题。

Under the weak vertical wind shear condition, several meso β clouds, the convective systems directly related to the torrential rain, develop strongly in vertical like towers within a meso α cloud;

在弱的风垂直切变环境下，梅雨锋中α对流云系中有数个中β尺度云呈塔状强烈垂直发展，它们是造成暴雨的中β尺度对流系统。

A statistical Study of Wind Shear in Tower Layer over Beijing urban boundary layer

北京城市边界层低空风切变的统计分析

Then, the actuator line code is used to study the unsteady aerodynamic characteristics of NREL wind turbine under wind shear inflow condition. Two hub height wind speeds of7m/ s and10m/ s are selected.

然后，采用致动线程序对NREL实验风力机在切变入流下的气动特性进行研究，选取了轮毂高度风速为7m/s和10m/s两种情况。

Using the mechanism of vertical and horizontal wind shear, we simulate the forming process of the mid-latitude sporadic E led by tides and planetary waves.

然后，从垂直风剪切和水平风剪切的基本思想出发，对潮汐和行星波形成中纬Es的过程进行了数值模拟研究；

Based on the tendency equation of turbulent kinetic energy, its simplified equation including only wind shear and air stability was derived.

基于湍流动能倾向方程，推导出了其只含风切变和大气稳定度的简化方程。

Characters of dynamic response with near-ground wind shear encounter and research of flight trajectory of H-6 aircraft

H-6飞机在低空风切变中的动态响应特性和下滑航迹的研究

By using the compressible hydrodynamic equations, a spectral equation describing propagation of AGW's in a region of vertical wind shear is derived.

根据可压缩情况下的流体力学方程组，导出垂直切变风场中大气声重波的谱方程。

Unstable development of internal inertial gravity waves on the wind shear lines

风速切变线上重力惯性波的不稳定发展