桂林“5.9”山体滑坡的暴雨成因分析  

Analysis on the Heavy Rain Causes of the Landslide on May 5^(th) in Guilin City

作　　者：李向红[1] 赵洁妮[1] 伍静[1] 王存真[1] 陈国连 郑传新[1] 

机构地区：[1]桂林市气象局,广西桂林541001 [2]荔浦县气象局,广西荔浦541002

出　　处：《灾害学》2013年第3期95-99,共5页Journal of Catastrophology

基　　金：桂林市科技开发计划项目"桂林市地质灾害气象条件研究"(20120119-1);中国气象局华南区域气象中心项目"广西汛期连续性暴雨前期强信号研究"(CRMC2012M07)

摘　　要：对造成2011年5月9日广西桂林咸水乡山体滑坡的暴雨成因进行了分析,结果表明,滑坡是由于暴雨因素诱发的地质灾害,短时强暴雨是造成山体滑坡的直接原因。大量的水汽传送到滑坡点,同时低层辐合抬升,因而滑坡点是大暴雨的发生地。滑坡发生滞后强降雨结束2.5 h。滑坡点位于暴雨中心带,暴雨区位于高空急流的右侧,200h Pa为强烈辐散区,高空辐散带的走向与山脉走向一致。西南低空急流与地形的相互作用是暴雨形成的直接原因,雷达回波显示在"湘桂走廊"存在强风速的出流与横向风速梯度,对应反射率有弓状回波,同时具有前侧V形入流缺口和后侧V形下沉缺口等对流单体特征。The heavy rain causes which led to the landslide in Xianshui town of Guilin city on May 5th, 2011 are analyzed. It is shown that the landslide geological disaster is resulted from heavy rain and the short-term torren- tial rain is the direct cause to the landslide. A lot of water vapor is transferred to the landslide point, and at the same time the low level convergence led to the strong uplift, therefore the heavy rain occurred on the landslide point. And the occurring of landslide lagged 2. 5 hours behind the ending of the severe torrential rain. The land- slide point located in the center area of the heavy rain region, which is on the right side of the high level jet stream, and the strong divergence area is at 200 hPa. The upper divergence region is corresponded with the mountains re- gion. The interaction between the southwest low level jet and topography is the direct cause of torrential rain. Radar echo showed that in the I-Iunan Guangxi Corridor there are strong outflow and transverse wind speed gradient, with refectory convective cell characters such as FFN at the ahead of bone echo and RIN at the behind of the bone echo.

关 键 词：滑坡 暴雨 地形 对流单体 桂林咸水乡 “5 9”山体滑坡 

分 类 号：P461[天文地球—大气科学及气象学] X43[环境科学与工程—灾害防治]