| 摘要: |
| 利用常规气象观测资料、区域自动气象站观测资料、探空资料、风云2G资料、降水实况融合产品以及EC EAR 0.25°× 0.25°逐小时再分析资料，对2020年6月22日綦江地区特大暴雨洪灾过程进行诊断分析。结果表明，此次过程发生在南亚高压脊线附近，500 hPa槽前，700 hPa和850 hPa低涡切变之间，850~500 hPa之间为一致的偏南暖湿气流不断输送水汽，近地面层为偏东回流冷空气形成冷垫爬升；对流云团生成、合并、发展，形成中尺度对流系统MCS，对强降水有很强的指示意义，且暴雨区发生在云团合并发展阶段且冷云区≤-52 ℃的区域；短时强降水伴随地面辐合线的生成而发生，且最强小时雨强中心出现在中尺度辐合线附近并随着辐合线缓慢向东移动；此次过程累积雨量大值区主要发生在綦江城区及綦江流域上游地区，其中过程累积雨量最大的站点达到了302.7 mm，綦江流域上游地区的站点基本都达到100 mm以上，最大小时雨强达到了64 mm·h-1，小时雨强强、累积雨量大是造成此次暴雨洪涝灾害的主要原因。 |
| 关键词: 綦江流域；特大暴雨；实况分析 |
| DOI： |
| 投稿时间：2021-06-09 |
| 基金项目:重庆市气象部门业务技术攻关项目：面向致灾过程的蒲河流域洪水演进模拟及检验(YWJSGG-202128)、重庆气温网格实况产品的偏差订正与评估(YWJSGG-202110)、綦江暖区暴雨特征分析及预报模型研究(YWJSGG-202012) |
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| Analysis on the Actual Situation and Influence System of 80 Years Heavy Rain in Qijiang River Basin |
| TIAN Maoju,KUANG Lan,HAI Chuan,MI Hongjie,PENG Xin |
| (Qijiang Meteorological Bureau of Chongqing City,Qijiang 401420 ,China;Wanzhou Meteorological Bureau of Chongqing City, Wanzhou 404100 ,China) |
| Abstract: |
| Based on conventional meteorological observation data, regional automatic weather station observation data, radiosonde data,Fy-2G data, precipitation fusion products and hourly reanalysis data of EC EAR 0.25° x 0.25°, the catastrophic rainstorm flood process in Qijiang area on June 22, 2020 was diagnosed and analyzed. The results show that the process occurs near the ridge line of the South Asian high, in front of the 500 hPa trough, between 700 hPa and 850 hPa vortex shear. Southerly warm and humid air between 850 hPa to 500 hPa continuously transports water vapor; near the surface layer. The cold air returning to the East forms a cold pad climbing. The convective cloud clusters generate, merge and develop to form a mesoscale convective system MCS, which has a strong indicative significance for heavy rainfall. The rainstorm area occurs in the cloud cluster merging development stage, and the cold cloud area is less than or equal to -52 ℃. The occurrence of short-term heavy rainfall is accompanied by the formation of ground convergence line, and the strongest hourly rain intensity center appears near the mesoscale convergence line and moves eastward slowly with the convergence line. The maximum accumulated rainfall area mainly occurs in Qijiang city and the upper reaches of Qihe River Basin.The station with the largest accumulated rainfall reaches 302.7 mm. The maximum hourly rainfall intensity is 64 mm·h-1. The main reason for the rainstorm and flood disaster is that the hourly rainfall intensity is strong and the accumulated rainfall is large. |
| Key words: Qijiang River Basin； heavy rain； analysis of the actual situation |
