地形强迫的流场非地转性与广西旱涝的空间分布

本文分析了地面平均流场，从地转偏差的角度讨论了广西多雨区与少雨区空间分布的动力学原因，着重指出“弧形山”结构在形成广西气候特点上的特殊作用。

THE AGEOSTROPHY OF AIR-CURRENT FIELD OF OROGRAPHIC COERCION AND THE SPATIAL DISTRIBUTION OF DROUGHT AND WATERLOGGING IN GUANGXI

Guangxi is situated in subtropical monsoon climate zone at low latitudes. Due to orographic effect,the rainfall distribution types are complicated in this region. Ageostrophic deviation is the dynamic cause of the spatial distribution of rainfall in Guangxi. Arc mountain mountain structure hasspecial effects on forming the climatic characteristics of Guangxi. In the earlier stage of flood season from from to June, various forms of obvious convergence aiways exist about Zhaoping County and a distinct rainfall centre is formed there. There are evident air-current convergencesand small orographic vortexes at Rong'an, Ziyuan in North, Fengshan in West and Longzhou in South Guangxi. Rainy zones are formed in the regions about-mentioned. An-current divergence zone lies nearby Tianyand County in rainy season, Which is a light rainfall area. Mountains in Guangxi is characterized by their are structure. Under the coercion of U-shaped mountainstructute, cyclonic and anticyclonic curvatures of the air-current of winter monsoon and summer monsoon occur in the east and the West of the mountains respectively, This is s one of the dynamic reasons why in Guangxi there are more rainfall in the north than in the south, as well as in the east than in the west during the earlier stage of find season. But it is on the contrary in the later stage of flood season. Thus, summer waterlogging and antumn drought usually occur at the right sides of the arc mountains While spring brought and autumn waterlogging at the left sides.