CAJ | 학술논문

以太行山东部3次迎风坡降水过程为例,分析了由多普勒雷达原始资料计算得到的径向辐合与迎风坡降水分布的关系:迎风坡降水大值区落在临近径向的辐合大值区的弱辐合区内,且降水中心落在正径向速度开始减小的边界同NE风急流相交的位置.连续分布的径向辐合越强,降水越强.同时以2004年7月11-12日过程为例说明单站径向辐合和降水率的关系:径向辐合越强,降水越强,且径向辐合变化超前于降水率变化1 h以上;径向辐合持续减弱3 h以上,降水率减小,直至结束.径向散度对迎风坡区域的降水预报有很好的指示作用:综合分析区域径向辐合分布和单站径向辐合随时间的变化,可以预测迎风坡降水的落区、发展及生消.
이태행산동부3차영풍파강수과정위례,분석료유다보륵뢰체원시자료계산득도적경향복합여영풍파강수분포적관계:영풍파강수대치구락재림근경향적복합대치구적약복합구내,차강수중심락재정경향속도개시감소적변계동NE풍급류상교적위치.련속분포적경향복합월강,강수월강.동시이2004년7월11-12일과정위례설명단참경향복합화강수솔적관계:경향복합월강,강수월강,차경향복합변화초전우강수솔변화1 h이상;경향복합지속감약3 h이상,강수솔감소,직지결속.경향산도대영풍파구역적강수예보유흔호적지시작용:종합분석구역경향복합분포화단참경향복합수시간적변화,가이예측영풍파강수적락구、발전급생소.
The relationship between radial divergence calculated by Doppler radar base data and precipitation distribution in windward slope are analyzed according to three rainfall processes in the east of Taihang Mountains windward side, the results suggest that the large value area of windward precipitation is located in the right weak convergence area of strong radial convergence (RC), and the center of precipitation is located in the intersection area between the boundary where positive radial speed began to decrease and the NE wind jet. The stronger the continuous distribution RC, the more intense the precipitation. The course of July 11-12, 2004 has been taken as an example to explain the relation between RC of a single station and rainrate: RC is directly proportional to precipitation intensity, and it is ahead of rainrate more than one hour. While RC continuously weakens more than 3h, the rainrate starts to decrease till over. Radial divergence is effective in precipitation forecast in windward slope, combining with region RC distribution and single-station RC change with time, the location, development, genesis as well as elimination of windward rainfall can be predicted.