蓟州区半山地形下汛期短历时强降水特征研究  

Study on the Characteristics of Short-time Severe Precipitation during the Rainy Season in the Half-Mountain Topography of Jizhou District

作　　者：邹双泽 白爱娟[1] 袁淑杰[1] 金海东 刘振元 黄金颖 ZOU Shuangze;BAI Aijuan;YUAN Shujie;JIN Haidong;LIU Zhenyuan;HUANG Jinyin(College of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China;Meteorological Service of Jizhou District Tianjin,Tianjin 301900,China)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]天津市蓟州区气象局,天津301900

出　　处：《成都信息工程大学学报》2021年第6期666-673,共8页Journal of Chengdu University of Information Technology

基　　金：青海省科技厅应用基础研究资助项目(2020-ZJ-739-1);气象灾害预测预警与应急管理研究中心科研资助项目(ZHYJ20-YB02);天津市蓟州区气象局“三农”资助项目。

摘　　要：为更好掌握典型半山地形下天津蓟州区短历时强降水特征,利用蓟州区39个区域自动气象站2014-2019年汛期(6-9月)逐小时降水资料,统计分析蓟州区汛期短历时强降水的多时空尺度变化特征,结果表明:(1)暴雨对雨量累积的贡献高达34.6%,北部半山区是降水中心;(2)各站小时降水量99%分位数计算的短历时强降水阈值高值区位于半山地形的迎风坡,87%测站阈值集中在20~30 mm/h;(3)7月上旬-8月中旬是蓟州区短历时强降水事件高发时段,半山地形下,逐月短历时强降水自南部平原向西北高地势区移动,最后快速南撤。短历时强降水的日变化表明强降水的夜发性显著,3-5时峰值最突出;(4)短历时强降水与半山地形关系密切,北部高海拔半山区最频发、日变化最剧烈,集中于后半夜。In order to better grasp the characteristics of short-duration heavy rainfall in Jizhou District,Tianjin under the typical half-hill terrain,the hourly precipitation data of 39 regional automatic weather stations in Jizhou District during the flood season(June-September)from 2014 to 2019 were used to statistically analyze Jizhou District.The multi-temporal and spatial-scale variation characteristics of the short-duration heavy rainfall during the flood season.The results show that:(1)Heavy rain contributes as high as 34.6%to the accumulation of rainfall,and the northern half-mountain area is the precipitation center;(2)The 99%quantile calculation of hourly precipitation at each station The high value area of the short-duration heavy precipitation threshold is located on the windward slope of the semi-mountain terrain,and 87%of the station thresholds are concentrated at 20-30 mm/h;(3)Early July to mid-August is the period of high occurrence of short-duration heavy precipitation events in Jizhou District.Under the semi-mountain terrain,the monthly short-duration heavy rainfall moved from the southern plain to the northwest high terrain area,and finally withdrew quickly south.The diurnal variation of short-duration heavy precipitation shows that the night-occurrence of heavy precipitation is significant,with the peak at 3-5 o’clock being the most prominent;(4)Short-duration heavy precipitation is closely related to the mountain topography,with the most frequent occurrence and the most intense daily variation in the northern high-altitude and mid-mountainous areas,Focus on the latter half of the night.

关 键 词：气象学 短历时强降水 半山地形区 蓟州区 阈值 多时空分布 日变化 

分 类 号：P458.121[天文地球—大气科学及气象学]