泥石流暴雨个例中尺度分析  

Mesoscale Analysis of a Heavy Rainfall Causing Mud-Rock Flow

作　　者：徐双柱[1] 金琪[1] 肖艳娇[1] 李俊 

机构地区：[1]湖北省气象局武汉中心气象台 [2]武汉暴雨研究所,武汉430074

出　　处：《气象科技》2005年第3期240-244,共5页Meteorological Science and Technology

摘　　要：对2003年7月8～9日发生在湖北中部并且造成泥石流灾害的大暴雨过程进行了中尺度分析,结果表明:①在有利的大尺度系统下产生的中小尺度系统是暴雨产生的最直接的系统;②湖北省泥石流灾害发生在特殊的地理位置,秭归、宜昌、宜都等鄂西山地到江汉平原的过渡带是泥石流灾害的多发地;③暴雨尤其是泥石流发生地周围的历时短、局地性强的大暴雨是泥石流灾害直接的诱发原因;④中尺度系统的源地与地形有关,在西南气流的背风坡容易形成中尺度系统;⑤多普勒雷达是监测中尺度系统的强有力工具,一个中α尺度云团中可以是一个也可以有两个以上的混合回波团或带;⑥中尺度涡旋形成于低空急流左侧强正涡度中心附近。By analyzing a heavy rainfall that brought out a mud-rock flow in the central Hubei Province from 8 to 9 July 2003, it was found: (1) the meso- and samll-scale system resulted in directly the heavy rainfall; (2) the occurring locations of the mud-rock flow are situated in a geographically special zone in Hubei Province, such as Zigui, Yichang, Yidu, etc, the transitional zone of plain and mountainous areas where mud-rock flow disasters occurs frequently; (3) the local short-range heavy rainfall was the direct cause of the mud-rock flow; (4) the source area of the meso-scale system was related to the topography, and meso-scale systems form frequently on the downwind hillside under southwest winds; (5) Doppler radar is a useful tool for monitoring the meso-scale system, and a mid-α scale cloud cluster may include one or even more mixed echo masses or belts; (6) the mesoscale vortex formed near the strong vorticity center on the left side of the lower-troposphere jet.

关 键 词：中尺度分析 泥石流灾害 中尺度系统 2003年7月 个例 中小尺度系统 大暴雨过程 大尺度系统 多普勒雷达 中尺度涡旋 地理位置 江汉平原 鄂西山地 诱发原因 低空急流 湖北省 过渡带 背风坡 地形 源地 气流 云团 涡度 

分 类 号：P458.121.1[天文地球—大气科学及气象学] P642.23