1) Environmental wind shear
环境风切变
3) environmental vertical wind shear
环境垂直风切变
1.
Using satellite observation data from various sources and analysis field supplied by NCAR/NCEP,the effects of sea surface temperature(SST) and environmental vertical wind shear on the intensity,convection and precipitation structure of super typhoon Sepat(0709) were analyzed.
利用多种卫星观测资料和NCAR/NCEP提供的分析场,分析海温和环境垂直风切变这两个环境因素对0709号超强台风"圣帕"的强度、对流和降水结构的影响。
2.
The results of the three experiments were analyzed comprehensively to show that the influence of environmental vertical wind shear on wave number-1 asymmetric rainfall structure of Bilis was significantly more important than the terrain,change of underlying surface properties during landfall,and storm speeds.
综合分析3个试验,结果表明环境垂直风切变对Bilis(2006)一波非对称降水结构形成的影响显著大于地形、登陆过程下垫面属性的改变和风暴移动速度的影响,冷空气的侵入对降水形成也有重要贡献。
4) monsoon environmental changes
季风环境变化
6) cutting environment
切割环境
1.
The underwater cutting environment was simulated and abrasive supply under high underwater ambient pressure was realized the relationship between eroding properties of underwater abrasive water jet and jet pressure target distances was obtained.
提出了水下高围压磨料射流切割模拟试验装置并对其进行了试验 ,实现了水下切割环境的模拟 ,成功地解决了水下高围压条件下磨料的供给 ,得出了靶距及射流压力对水下磨料射流冲蚀性能的影响规
补充资料:风切变
风矢量(风向、风速)在空中水平和(或)垂直距离上的变化。对飞机起飞和着陆安全威胁最大的是低空风切变,即发生在着陆进场或起飞爬升阶段的风切变。它不仅能使飞机航迹偏离,而且可能使飞机失去稳定。如果驾驶员判断失误和处置不当,则常会产生严重后果。世界上曾因此发生多起机毁人亡的飞行事故。风切变还严重影响火箭飞行的稳定性,火箭设计和发射时的环境限制条件包括风切变。风切变主要由锋面(冷暖空气的交界面)、逆温层、雷暴、复杂地形地物和地面摩擦效应等因素引起。为了确保安全,国际航空、航天和气象界都积极开展低空风切变的研究。风切变常分为以下几种:①风的水平切变是水平风向和(或)风速在水平距离上的变化。②风的垂直切变是水平风向和(或)风速在垂直距离上的变化。③垂直风的切变是垂直风(即升降气流)在水平或航迹方向上的变化。下冲气流是垂直风的切变的一种形式,呈现为一股强烈的下降气流。范围小而强度很大的下冲气流称为微下冲气流。
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