在气象学中,阵性是指风向变化不定、风速忽大忽小的现象。主要是由气流中挟带一些大小不等的涡旋使局地气流加强、减弱或改变方向所致。附图表示在大范围平均气流(实线)上挟带着的小涡旋(虚线),A处两者流向一致,使风速加大;B处两者反向,使风速减小;在C处和D处,两者垂直,使风向发生顺时针和逆时针偏转。对于一定地点来说,随着涡旋的过往,风向忽左忽右,风速忽大忽小。近地面层的风,很小不带阵性的,风的阵性的研究,对农业,航空、建筑设计等方面都有实用价值。
海上的风完全可能象陆上的风一样具有阵性,且它在两地改变方向同样频繁。
Winds are just as likely to be gusty at sea as on land, and just as likely to change direction as not.
试验表明,稀性泥石流阵性的起因首先决定于流域内形成的原始出流过程。
It is made clear that the formation of debris surge is firstly determined by the original hydrograph of the basin.
从泥石流体流变特性的分析入手,深入地探讨了蒋家沟泥石流阵性流的淤积和冲刷特征。
Proceeding from rheological properties of debris flow, the erosion deposit properties of debris flow surges in Jiangjia Ravine are discussed.
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