| 1951—2014年淮河流域降水量时空变化特征 |
| |
| 作者单位： | ;1.信阳师范学院南北过渡带研究中心;2.兰州大学地质科学与矿产资源学院&甘肃省西部矿产资源重点实验室 |
| |
| 摘 要： | 以1951—2014年淮河流域29个站点月降水量数据为研究对象,运用线性趋势、累积距平、小波分析及空间分析等方法,分析了降水量时间和空间变化特征.结果表明:(1)1951—2014年,年、春、夏和秋季降水量呈不显著减少趋势,冬季降水量则具有不显著增加趋势.(2)春、秋和冬季易发生旱涝灾害,夏季降水量变化控制年降水量变化.(3)年降水量具有准2a和6a振荡周期.(4)东南部年和四季降水量多于西北部,这与我国年和四季降水量分布模式一致.(5)空间上,年和四季降水量变率中,年和夏季最大,降水量减少区域呈半环状包围降水量增加区域;整个流域冬季降水量几乎没有变化.
|
| 关 键 词： | 淮河流域 降水量 时空变化 |
Characteristics of Temporal and Spatial Variations of Rainfall in Huaihe River Basin During 1951-2014 |
| |
| Institution: | ,Research Center of North and South Transition Zone in China,Xinyang Normal University,College of Geological Science and Mineral Resources,Key Laboratory of Mineral Resources in Western China(Gansu Province),Lanzhou University |
| |
| Abstract: | Monthly rainfall data of 29 meteorological stations in Huaihe River Basin during 1951-2014 was selected for study.Multiple methods,including linear trend,accumulative anomaly,wavelet analysis and spatial analysis,were applied to detect spatial and temporal characteristics of rainfall variations.The results showed that(1)linear trend for annual,spring,summer and autumn precipitation decreased slightly,and the increasing trend for winter rainfall was not as well obvious;(2)more drought and flood events occurred in spring,autumn and winter.Variation of summer precipitation dominated annual rainfall;(3)quasi-periodicity of 2years and 6years were detected in annual rainfall;(4)it indicated an decreasing gradient from southeastern to northwestern in Huaihe River Basin,which was similar in pattern with China;(5)variations of annual and summer precipitation at spatial time scale were stronger than other seasons,and regions with increasing rainfall were surrounded by regions with decreasing rainfall.Regional winter precipitation fluctuated with no significant trend during the period of 1951-2014. |
| |
| Keywords: | Huaihe River Basin rainfall temporal and spatial variation |
|
|
