毕节市暴雨时空分布特征分析

Analysis on spatial and temporal distribution characteristics of Bijie heavy rain

文章选取1990~2019年毕节市8个国家气候站降雨资料和2010~2019年毕节市区域自动气象站的降雨资料,对毕节市暴雨的时空分布进行分析,结果表明:毕节市年均降雨量、年均暴雨日数及日最大降雨量空间分布具有明显的地域差异,呈现出东南多、西北少的分布特征。暴雨天气的月变化和季节变化明显,均呈现“单峰型”特征,集中发生在6~9月,其中7月暴雨发生频率最高;大暴雨天气集中发生在夏季。

This paper analyzes the spatial and temporal distribution of the rainstorm in Bijie by selecting the rainfall data of 8 national climate stations and the rainfall data of the automatic weather stations in Bijie from 1990 to 2019.The results show that the spatial distribution of average annual rainfall,average annual rainstorm days and maximum daily rainfall in Bijie has obvious regional differences,showing the distribution characteristics of more in the southeast and less in the northwest.The monthly and seasonal changes of rainstorm weather are obvious,presenting the characteristics of single peak.It mainly occurs from June to September,with July as the most frequent occurrence.Heavy rain is concentrated in the summer.