库车大峡谷景区“7.19”突发山洪成因分析

Analysis of the Causes of the “7.19” Sudden Mountain Flood in the Grand Canyon Scenic Area of Kuqa City

摘要: 文章基于气象高低空观测资料、欧洲中心再分析资料、卫星和雷达资料，开展2022年7月19日库车大峡谷暴雨山洪强对流天气成因分析，结果表明：乌拉尔山阻塞高压南跨迫使西西伯利亚低涡东移南下分裂短波造成；对流层中高层有中等强度垂直风切变，大气具有下暖上冷的不稳定层结结构，有利于强对流短时强降水的产生；中低层700~850 hPa正涡度平流加速气流气旋式旋转，为强对流天气提供辐合及上升运动条件。

Abstract: Based on the meteorological high and low altitude observation data, the European Center reanalysis data, satellite and radar data, this paper carried out an analysis of the causes of the severe convection weather of the Kuqa Grand Canyon rainstorms and mountain torrent on July 19, 2022. The results show that the blocking high of the Ural Mountains forced the West Siberian Low Vortex to move eastward and fall southward, which was caused by the splitting short wave. There is moderate-intensity vertical wind shear in the upper and middle layers of the troposphere, and the atmosphere has an unstable layer structure of warm from the bottom and cold from the top, which is conducive to the generation of short-term strong convective precipitation. The 700 - 850 hPa positive vorticity advection accelerates the cyclonic rotation of airflow in the middle and lower layers, providing convergence and upward motion conditions for strong convective weather.