| 摘要: |
| 该文利用汕尾市53个自动气象站常规降水观测资料,采用统计分析法及Surfer软件对2013—2017年62个大暴雨(≥100 mm/24 h)以上降水特征进行了分析。结果表明：①汕尾大暴雨季节性明显，主要集中在5—8月，且大暴雨日数月变化呈单峰型特征。②前、后汛期大暴雨日变化特征有所区别，前汛期呈双峰型特征；后汛期日变化特征不明显。③汕尾大暴雨小时雨强与出现频率成反比，易出现日雨量300 mm以上极端强降水。④汕尾有2个大暴雨高发区域，分别位于海丰西南部和陆丰中部。⑤汕尾大暴雨影响系统大致分为台风型、季风低压型、冷空气切变线型、西南季风型、东南气流型和偏南气流型，其中5—6月以西南季风型为主；7月以台风型、季风低压型为主；8—10月多为台风型。 |
| 关键词: 大暴雨；时空分布特征；影响系统；汕尾 |
| DOI： |
| 投稿时间：2020-11-17 |
| 基金项目: |
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| The Characteristics of Heavy Rainstorm in Shanwei from 2013 to 2017 and the Classification of Influencing Weather System |
| CHEN Yucong,LIU Bingfeng,LIU Jiajing,ZHANG Yi |
| (Shanwei Meteorological Bureau of Guangdong Province,Shanwei 516600 , China) |
| Abstract: |
| In this paper, the conventional precipitation observation data of 53 automatic weather stations in Shanwei city were analyzed by statistical analysis and Surfer software for the precipitation characteristics of 62 heavy rainstorms (≥100mm/24 h) from 2013 to 2017. The results show that :① The heavy rainstorm in Shanwei has obvious seasonality,mainly occurs from May to August，and the monthly variation of heavy rainstorm showed a unimodal pattern.②It is distinct in the diurnal variation characteristics of heavy rain in the early and later flood season. And the early flood season takes on the characteristics of double peak while the diurnal variation characteristics of later flood season are not obvious. ③ The hourly rainfall intensity of heavy rainstorm in Shanwei is inversely proportional to the occurrence frequency which is easily prone to extreme heavy rainfall with daily rainfall of more than 300mm.④ Shanwei has two areas which are more likely to have heavy rain, situated in the southwest of Haifeng and the middle of Lufeng respectively. ⑤ Generally, the influence system of heavy rainstorm in Shanwei is typhoon type, monsoon low pressure type, cold air shear line type, southwest monsoon type, southeast and south air flow type. Among those types, southwest monsoon type is the main type from May to June; July is dominated by typhoon type and monsoon low pressure type and it is mostly typhoon type from August to October in the whole year. |
| Key words: heavy rainstorm； spatiotemporal distribution； influence system； Shanwei |
