云南不同类型地质灾害的天气诱因分析

Analysis of Weather Inducements of Different Types of Geological Disasters in Yunnan

2017年6月24日和2019年9月30日云南省昭通市盐津县出现了两次严重的地质灾害,造成重大人员伤亡和财产损失。本文利用NCEP再分析资料、地面自动站观测资料及多普勒天气雷达探测资料,对比分析了两次灾害的天气诱因。结果表明:“6.24”滑坡灾害发生在夏季主汛期,是由冷暖空气长时间交汇造成的持续性降水天气导致,期间伴有几次区域性强降水过程,雷达回波以大范围层积混合云回波特征为主,对流性暴雨特征不明显。“9.30”泥石流灾害发生在大气环流突变的秋季,冷暖空气势力较弱,天气尺度系统造成的区域降水强度不大,而由局地热力作用造成的单点对流性强降水才是灾害发生的主要诱因。

On June 24,2017 and September 30,2019,there were two serious geological disasters in Yunnan Province,causing heavy casualties and property losses.By using NCEP reanalysis data,ground automatic station observation data and Doppler weather radar detection data,the weather causes of the two disasters were analyzed.The results showed that the'6.24'landslide disaster occured during the main flood season of summer,which was caused by the long-term convergence of cold and warm air.There were several regional precipitations during this period.The radar was mainly composed of stratocumulus mixed cloud,and the characteristics of convective rainstorms were not obvious.The'9.30'mudslide disaster occurred in the autumn with a sudden change of atmospheric circulation.The cold air and warm air were weak,and the regional precipitation caused by the large-scale system was not very strong.Single-point convective strong precipitation caused by local geothermal action was the main cause of disasters.