贵州修文暴雨时空分布特性研究

Study on the Spatial and Temporal Distribution of Rainstorm in Xiuwen County of Guizhou Province

基于修文县国家站及修文县9个国家级考核区域自动站观测数据,利用主成分分析法及相关性分析等方法,分析了贵州修文暴雨的时空演变特征。结果表明:修文县暴雨主要发生在5~8月份,年平均日最大暴雨强度随着年代的变化是非线性的,暴雨日数与强度在季节变化上基本呈同步变化,且年平均暴雨日数在2.4~3.3 d;修文县的暴雨天气过程主要发生在东南部乡镇,且暴雨极值主要出现在西北部乡镇;研究区域夏季暴雨出现呈降低趋势且局地性十分明显。

Trend analysis and the principal component analysis were used to analyze the rainstorm annual variability in Xiuwen County of Guizhou.It is found that the rainstorm mainly occurred from May to August and the annual average daily maximum rainstorm intensity was nonlinear with time.The seasonal variation was basically synchronous between rainstorm days and rainstorm intensity and the annual average rainstorm days were from^(2).4 to 3.3 days.The rainstorm process in Xiuwen County mainly occurred in the southeast towns and the rainstorm extreme value mainly occurred in the northwest towns.The occurrence of summer heavy rainfall in the study area showed a decreasing trend and the local nature was very obvious.