洛阳市暴雨时空分布特征

通过统计分析洛阳市1961~2010年9个站逐日雨量资料和2008~2012年107个单雨量站和39个四要素站逐日雨量资料,得出洛阳市暴雨的时空分布特征。结果表明,20世纪70年代至21世纪以来洛阳市暴雨出现的站次呈缓慢减少趋势,特别是21世纪以来的10年除2003、2004和2010年较常年平均略偏多外,其余年份显著偏少;洛阳暴雨最早出现在4月,最晚出现在10月;50年资料显示洛阳暴雨集中出现在7、8月份,但区域自动站资料显示近5年7、8月份洛阳暴雨出现日数在全年中的比重大幅度减少;栾川西部、栾川东南部,洛宁西部、洛宁东部和宜阳交界处、伊川和偃师的东部、新安东南部、洛阳市区南部及宜阳东部和伊川北部交界处是暴雨多发区域;洛阳市暴雨有显著的地域性特点,近5年来暴雨日数最多的区域多处于山坡或峡谷地带。

Spatial and Temporal Distribution of Rainstorms in Luoyang City

Based on the daily rainfall data during 1961-2010 provided by 9 stations in Luoyang,and the daily rainfall data during 2008-2012 provided by 107 automatic rainfall stations and 39 four elements stations,the spatial and temporal distribution characteristics of rainfall in Luoyang City were obtained.The results showed that since 1970s＇,rainstorm presented decreasing trend in Luoyang,except in 2003,2004 and 2010.The earliest rainstorm appeared in Apr.,and the last in Oct.; 50 years data showed that rainstorm in Luoyang mainly concentrated in Jul.and Aug.,but regional automation station data indicated that in recent 5 years,rainstorm days decreased obviously in Jul.and Aug.; The more rainstorm region includes the west,southeast part of Luanchuan,west,east part of Luoning and boundary with Yiyang,Yichuan,east of Yanshi,southeast of Xinan,south of Luoyang City,east of Yiyang,north of Yichuan; Rainstorm in Luoyang City has significant regional characteristics,rainstorm days in recent 5 years mainly concentrated in mountain slopes or valleys.