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贵州水城“7.23”山体滑坡大暴雨成因分析
周文, 王晓芳
(中国气象局武汉暴雨研究所)
Analysis on the Heavy Rain Causes of the Landslide on July 23rd in Shuicheng
zhou wen, Wang Xiaofang
(Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration)
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投稿时间:2020-08-03    修订日期:2021-06-30
中文摘要: 利用中国气象局地面站降水资料、欧洲中心ERA5(the fifth generation of European Centre for Medium-Range Weather Forecasts Reanalysis)再分析资料、FY-4A相当黑体亮温 (Black-Body Temperature,TBB)资料,分析了造成贵州水城“7.23”山体滑坡的大暴雨成因。结果表明,最强降水是由TBB低于-82℃的对流云带造成的,影响本次强降水的天气系统主要为贵州西部700-750hPa低槽及四川盆地北部冷锋。暴雨发生之前,四川盆地北部冷锋迫使盆地内高能气团向贵州西北部移动。随着水城县鸡场镇南侧偏南气流发展,为强降水发生提供充足的水汽条件,同时因暖湿气流的增强使得鸡场镇低层对流不稳定性增强。降水初期(22日20时)上升运动主要位于700hPa以下,这与鸡场镇地面偏东气流遇到地形阻挡,沿地形爬坡产生的上升运动影响有关。随天气尺度气旋性环流扩展到贵州境内,此时应是中低层辐合上升运动增强带来大范围的降水发生,但实际降水区域只发生在气旋性环流内较狭窄的带中。通过Barnes带通滤波分析,天气尺度的气旋性流场内存在一些小尺度的气旋、反气旋排列,鸡场镇西侧有两个小气旋环流,它们北侧的强气流汇合带正好是降水发生区,鸡场镇此时还位于一个小尺度鞍形场区域中,明显有利于中低层气流汇合,叠加地形性上升运动,导致突发性暴雨发生,造成了山体滑坡的形成。
Abstract:Based on the precipitation data from China meteorology administrator, ERA5 (the fifth generation of European Centre for Medium-Range Weather Forecasts Reanalysis) reanalysis data and the TBB (Black-Body Temperature) data from FY-4A, the factors of heavy rain causing landslide on July 23, 2019 were investigated. The results are listed as follows: it was found that the strongest precipitation at 22 BJT was caused by the convective cloud belt with TBB below -82℃, its weather systems were 700-750hPa low trough and the cold front in the north of Sichuan basin. Before the rainstorm, the cold front in the north of Sichuan basin forced the air with large energy flowing from the basin to northwestern Guizhou. With the development of southern airflow in the south of Jichang Town, Shuicheng County, sufficient water vapor conditions were provided for the occurrence of heavy rainfall. Meanwhile, the enhancement of warm and humid airflow made the convective instability in the lower layer of Jichang town increase. At the beginning of the precipitation period (20BJT), the upward movement was mainly below 700 hPa, which was related to the influence of the easterly airflow that encountered the topographic obstruction and climbed along the slope of the terrain at Jichang town. As the weather-scale cyclonic circulation extended into Guizhou, widespread precipitation should occur as a result of the enhanced upward motion at the middle and lower layers, but the actual precipitation areas occurred only in the narrower zones of the cyclonic circulation. After Barnes band-pass filter analysis, it was found there were a number of small-scale cyclones and anticyclones in the weather-scale cyclonic flow field, and there were two small cyclone circulation on the west side of Jichang town, and the strong convergence zone on the north side of them was just the precipitation zone。At the same time, Jichang town was also located in a small-scale saddle-shaped field region, which was obviously favorable to the convergence at low and middle level, superimposing with topographic upward motion, the sudden heavy rainfall occurred, which caused the formation of landslides.
文章编号:202008030272     中图分类号:P458    文献标志码:
基金项目:科技部国家重点研发专项项目(2018YFC1507202),国家自然科学基金项目(41975058,41620104009,91637211)共同资助
作者单位地址
周文 中国气象局武汉暴雨研究所 湖北省武汉市东湖新技术开发区金融港二路6号
王晓芳 中国气象局武汉暴雨研究所 湖北省武汉市东湖新技术开发区金融港二路6号
Author NameAffiliationAddress
zhou wen Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration 湖北省武汉市东湖新技术开发区金融港二路6号
Wang Xiaofang  湖北省武汉市东湖新技术开发区金融港二路6号
引用文本:
周文,王晓芳,.Analysis on the Heavy Rain Causes of the Landslide on July 23rd in Shuicheng[J].Meteor Mon,():-.
zhou wen,Wang Xiaofang,.Analysis on the Heavy Rain Causes of the Landslide on July 23rd in Shuicheng[J].Meteor Mon,():-.