학술논문
陕西省极端降水事件时空分布特征研究 / Spatial and Temporal Characteristics of Extreme Precipitation Events in Shaanxi Province
Document Type
Academic Journal
Author
Source
河南科学 / Henan Science. 41(12):1832-1840
Subject
Language
Chinese
ISSN
1004-3918
Abstract
根据陕西省1977-2016年35个气象站点的日降水数据,采用中雨、大雨、暴雨日数及年总降水量、降水强度和强降水量6个极端降水指数研究极端降水事件及其空间分布特征.基于线性回归分析法、克里金插值法、M-K突变检验法、Morlet小波分析法对极端降水事件进行年际变化分析、空间分析、突变分析和周期分析.结果表明:①从时间上看,陕西省1977-2016年中,中雨、暴雨日数及年总降水量和强降水量均呈下降趋势,大雨日数和降水强度呈上升趋势.②从空间分布看,中雨、大雨、暴雨日数及年总降水量、降水强度和强降水量均呈由陕北地区向陕南地区递增的趋势.③年总降水量仅在2003年发生突变.④年总降水量、降水强度和强降水量的变化周期为15年,中雨日数的变化周期为7年,大雨和暴雨日数的变化周期为19年.
In order to research the spatial and temporal characteristics of extreme precipitation events in Shaanxi Province in recent 40 years,the extreme precipitation indices including moderate rain days,heavy rain days,rainstorm days,total annual precipitation,precipitation intensity,and heavy precipitation were used to reflect the characteristics and trends of extreme precipitation events based on daily precipitation data of 35 meteorological stations from 1977 to 2016 in this study.Based on linear regression analysis,Kriging interpolation method,M-K mutation test method and Morlet wavelet analysis method,the interannual variation analysis,spatial analysis,mutation analysis and periodic analysis of extreme precipitation events were carried out.The results show as follows:① The number of moderate rain days,rainstorm days,annual total precipitation and strong precipitation in Shaanxi Province from 1977 to 2016 showed a downward trend,while the number of heavy rain days and precipitation intensity showed an upward trend.②The moderate rain days,heavy rain days,rainstorm days,annual total precipitation,precipitation intensity and heavy precipitation all increased from northern Shaanxi to southern Shaanxi.③ The annual total precipitation changed in 2003.④The periodicities of annual total precipitation,precipitation intensity and heavy precipitation are 15 years,the periodicity of moderate rain days is 7 years,and the periodicities of heavy rain days and rainstorm days is 19 years.
In order to research the spatial and temporal characteristics of extreme precipitation events in Shaanxi Province in recent 40 years,the extreme precipitation indices including moderate rain days,heavy rain days,rainstorm days,total annual precipitation,precipitation intensity,and heavy precipitation were used to reflect the characteristics and trends of extreme precipitation events based on daily precipitation data of 35 meteorological stations from 1977 to 2016 in this study.Based on linear regression analysis,Kriging interpolation method,M-K mutation test method and Morlet wavelet analysis method,the interannual variation analysis,spatial analysis,mutation analysis and periodic analysis of extreme precipitation events were carried out.The results show as follows:① The number of moderate rain days,rainstorm days,annual total precipitation and strong precipitation in Shaanxi Province from 1977 to 2016 showed a downward trend,while the number of heavy rain days and precipitation intensity showed an upward trend.②The moderate rain days,heavy rain days,rainstorm days,annual total precipitation,precipitation intensity and heavy precipitation all increased from northern Shaanxi to southern Shaanxi.③ The annual total precipitation changed in 2003.④The periodicities of annual total precipitation,precipitation intensity and heavy precipitation are 15 years,the periodicity of moderate rain days is 7 years,and the periodicities of heavy rain days and rainstorm days is 19 years.