ZOU Shuangze,BAI Aijuan,YUAN Shujie,et al.Study on the Characteristics of Short-time Severe Precipitation during the Rainy Season in the Half-Mountain Topography of Jizhou District[J].Journal of Chengdu University of Information Technology,2021,36(06):666-673.[doi:10.16836/j.cnki.jcuit.2021.06.013]
蓟州区半山地形下汛期短历时强降水特征研究
- Title:
- Study on the Characteristics of Short-time Severe Precipitation during the Rainy Season in the Half-Mountain Topography of Jizhou District
- 文章编号:
- 2096-1618(2021)06-0666-08
- Keywords:
- meteorology; short-duration heavy precipitation; mountainous terrain; Jizhou; threshold; multi-temporal and spatial distribution; diurnal variation
- 分类号:
- P458.1+21
- 文献标志码:
- A
- 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。
- Abstract:
- 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.
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备注/Memo
收稿日期:2020-12-07
基金项目: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