摘要
选取陕西关中地区1960年~2013年12个雨量站的逐日降水资料,分析其降水时空变化特征;计算各站年降水集中度(PCD)和集中期(PCP)指标,基于PCD和PCP分析降水集中度和集中期多年平均值及其变化趋势;运用降水集中度指数Q对年降水及夏季降水进行分析。研究结果表明:关中地区PCD值在0.33~0.67之间,平均值为0.51,PCP值在148.6~236之间,平均值为191.8;该区域降水相对集中,最大降水主要出现在7月下旬和8月上旬之间,个别年份存在偏差;区域PCD呈现增大趋势,PCP呈现减小趋势;研究区12个雨量站的年降水集中度Q值均呈增大趋势,表明降水更加集中,和PCD计算结果一致;夏季降水集中度Q指数有减小趋势,但是不明显。
Based on the daily precipitation data from 12 stations in Guanzhong region of Shaanxi Province from 1960 to 2013,the spatial and temporal variations of precipitation were analyzed.The annual precipitation concentration degree(PCD)and concentration period(PCP)indices of each station were calculated.The annual mean value and change trend of precipitation concentration degree and concentration period were analyzed.The precipitation concentration indices Q was used to analyze annual precipitation and summer precipitation.The results showed that the PCD value in Guanzhong region was between 0.33 and 0.67 with an average value of 0.51,and the PCP value was between 148.6 and 236 with an average value of 191.8.Precipitation in this region is relatively concentrated,and the maximum precipitation mainly occurs between late July and early August,but vary in some years.Regional PCD showed an increasing trend,while PCP showed a slight decreasing trend.The annual precipitation concentration degree Q of 12 rainfall stations in the study area showed an increasing trend,indicating that the precipitation was more concentrated,which was consistent with the PCD calculation results.Q index of summer precipitation concentration has a decreasing trend,but not obvious.
作者
李斌
王莉
Li Bin;Wang Li(Shaanxi Provincial Department of Water Resources,Xi’an,710004,Shaanxi;Shaanxi Provincial River Reservoir Administration Bureau,Xi’an,710018,Shaanxi)
出处
《陕西水利》
2020年第2期36-41,共6页
Shaanxi Water Resources
关键词
降水集中度
降水集中期
变化特征
关中地区
Precipitation concentration Degree
Precipitation concentration period
the variation characteristics and Guanzhong Area
