“7.15”宜昌大暴雨的地形影响特征  

Yichang Topographic Effects of the 15 July 2007 Heavy Rain

作　　者：郭英莲[1] 吴翠红[1] 王继竹[1] 王平[1] 王珏[1] 吴涛[1] 

机构地区：[1]武汉中心气象台,武汉430074

出　　处：《气象》2012年第1期81-89,共9页Meteorological Monthly

基　　金：中国气象局公益性行业专项"中尺度对流性天气诊断分析方法研究"资助

摘　　要：湖北地形复杂,受地形影响产生的局地强降水造成的灾害很多。2010年7月15日宜昌地区的强降水是在满足大尺度降水条件下受地形作用加强的局地暴雨。本文利用实况高空、地面、加密自动站、雷达以及LAPS再分析资料对背景场、低层流场、雷达回波等几个方面进行了分析。得出:冷空气南下和副热带高压的加强促进低层风场的调整,在大尺度降水条件下,地形对低层风场的辐合作用触发了局地强降水的发生。此次过程中地形对降水的触发主要有两方面的作用:一方面为地形迎风坡抬升触发作用,另一方面为地形对近地层流场的影响造成的辐合触发。The terrain of Hubei Province is very complicated,and the loss of local heavy rainfall caused by terrain is serious.The heavy rainfall of Yichang region on 15 July 2010,is strengthened by landform effects,and occurred under a good background condition.Using the upper-air observation data,surface observation data,surface intensive observation data,the Doppler radar data and LAPS reanalysis data,the background field,surface layer air flows and radar echoes are analyzed.Research indicates that both the southward moving cold air and the strengthening subtropical high promote the adjustment of surface layer atmospheric wind fields,and the flow convergence effect on the local heavy rainfall results in a lager-scale rainfall event.There are two trigger actions by the terrain in this process,one is wind lifting in the upward side,and the other is the convergence of surface layer flow circulation.

关 键 词：地形 强降水 近地层风场 

分 类 号：P441[天文地球—大气科学及气象学]