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广西汛期不同等级小时强降水时空特征分析
陈飞盛,孙靖雯
0
(广西梧州市气象局)
摘要:
首先对小时降雨量≥20mm的降水进行分级定义。小时强降水具有强度大、雨强强等特点,容易带来城市内涝、山体滑坡等灾害。利用广西1243个区域自动气象站以及92个国家气象站小时降水数据,对广西4-9月小时强降水的时空变化特征进行分析。结果发现:20mm/h量级的强降水年际变化最小,量级越大年际变化越大。广西的小时强降水主要出现在6月,其次是5月和7月,尤其是在6月的第2侯和第3侯,是小时强降水的多发期。小时强降水在一天当中每个时次均有出现的可能,但发现出现时次较多的是在早晨和夜间时段。受迎风坡和喇叭口等地形的强迫抬升因素影响,强降水空间分布跟山脉走向具有重要的关系。
关键词:  小时强降水  频次  时空特征  地形
DOI:
投稿时间:2020-07-22修订日期:2020-07-22
基金项目:不同干旱指标在梧州的适用性研究(梧气科2016006)
Analysis of spatio temporal characteristics of hourly heavy precipitation in different grades in Guangxi
()
Abstract:
Firstly, the precipitation with hourly rainfall ≥ 20 mm is classified. Hourly heavy rainfall has the characteristics of strong intensity and strong rain, which is easy to bring urban waterlogging, landslides and other disasters. Based on the hourly precipitation data of 1243 regional automatic weather stations and 92 national weather stations in Guangxi, the temporal and spatial variation characteristics of hourly heavy rainfall from April to September in Guangxi were analyzed. The results show that the interannual variation of heavy rainfall of 20 mm / h is the smallest, and the larger the magnitude, the greater the interannual variation. The hourly heavy rainfall in Guangxi mainly occurs in June, followed by May and July, especially in the second and third Hou in June, which is the frequent period of hourly heavy rainfall. It is possible for hourly heavy rainfall to occur at every time of the day, but it is found that the occurrence times are more in the morning and at night. The spatial distribution of heavy rainfall has an important relationship with the trend of the mountains due to the forced uplift of the windward slope and trumpet mouth.
Key words:  hourly heavy precipitation  frequency  spationtemporal characteristics  topography

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