水平切变

中层冷空气的推动、风场垂直和水平切变及地形强迫抬升是这次暴洪过程中尺度系统的动力因子和触发条件。

Push of cold air in middle layer , vertical and horizontal shear of wind field and forced uplift of landform are the dynamical factors and touching off conditions .

水平切变线上涡层不稳定理论

The instability of the vortex sheet along the horizontal shear line

同时还进行了具有水平切变的对流边界层模拟研究。

And according to the similarity theory , a new kind of water-tank is designed to study the convective boundary layer with the horizontal shear .

实验结果显示：该水槽能较好地模拟具有水平切变的对流边界层的发展过程，为后续工作的开展提供了一个很好的平台。

The experimental results show that this water-tank can be well to simulate the development of the convective boundary layer with horizontal shear . And for the subsequent workes , it provides a good physical simulation platform .

从Brunt-Vaisala频率N和水平风切变计算的Richardson数Ri剖面也显示出季节差异，Ri<1/4的动力不稳定区出现在夏季，而Ri>0.4的稳定区出现在冬季。

Richardson number Ri calculated from Brunt-Vaisala frequency N and horizontal wind shear S also reveals seasonal difference : dynamically unstable regions of Ri smaller than 1 / 4 are observed in summer , whereas stable regions of Ri larger than 0.4 are observed in winter .

一次低空水平风切变的小尺度特征分析

Analysis of a Small-scale Low Level Horizontal Wind Shear Process over Qingdao Airport

中尺度干涌的涌入促使强对流云团群合并发展，并加剧对流辐合体内水平风切变，最终导致龙卷产生。

East moving of the mesoscale dry surge intensified the horizontal wind shear , at last caused the tornado .

低层有水平的切变线及横槽，地面有强风切变及锋面的形成。

In the lower level , there is a shear line and the horizontal through and the formation of the frontal on the ground .

关于含有水平及垂直切变的二维流体的非线性波的稳定性

Nonlinear wave stability of the two-dimensional fluid with horizontal and vertical wind shear

弱的水平风速垂直切变和暖洋面的加热作用，也是台风维持的原因。

Weak vertical shear and warm ocean surface were also the reasons to remain the intensity of typhoon .

本文研究在具有水平和垂直切变的平行基本流场中的二维非静力平衡扰动，扰动沿基本流方向不变。

In this paper the stability of two-dimensional symmetric perturbations to a non-static stratified basic flow with vertical and horizontal shear is investigated .

那曲强雷暴天气发生前，低空常出现强西南或东南风急流，且存在强水平风速垂直切变，两者可能是那曲雷暴天气频发的重要原因之一。

There often exist strong low-level southwest jet and wind vertical sheer before storm weather comes in Naqu area , and the two factors above may be important causes of local storm in rain season .

结果表明，这次强对流天气是在有利的大尺度天气形势下产生的，局地环境CAPE指数大，水平风的垂直切变较强。

The result shows that the severe convective storm occurred under the advantageous large scale weather conditions , with local large CAPE index and strong vertical shear of horizontal wind . Severe hail is caused by multicell severe storm .

水平风的垂切变对飞机纵向稳定性的影响

Influence of windshear on longitudinal stability of flight

试验表明，地表潜热通量结合低空急流的水平输送是夏季切变线和准静止锋这一类强降水形成的主要原因之一。

The numerical experiments show that the integrating of surface flux formed horizontal transfer of lower tropospheric jet is one main reason of the severe precipitation with shear line or quasi-stationary front in summer .

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。

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 .

在现有的对流水槽中引入水平流动，模拟了具有水平切变的对流边界层的发展过程。

The development process of the convective boundary layer with horizontal shear has been simulated using the convection water-tank while realizing horizontal flow .