近50a宁夏南部山区降水特征变化趋势分析
Analysis of Rainfall Trends in Southern Ningxia Mountainous Areas Over the Past 50 Years
董立霞 1谭军利 2马轶 2张维江2
作者信息
- 1. 宁夏大学土木与水利工程学院,宁夏 银川 750021
- 2. 宁夏大学土木与水利工程学院,宁夏 银川 750021;旱区现代农业水资源高效利用教育部工程研究中心,宁夏 银川 750021;宁夏节水灌溉与水资源调控工程技术研究中心,宁夏 银川 750021
- 折叠
摘要
为了研究宁夏南部山区降水特征及变化趋势,利用宁夏六盘山和固原气象观测站点的日降水数据资料,采用滑动平均法、线性趋势法、时间序列分析法、Mann-Kendall(MK)检验法和小波分析等方法,分析了近 50 a宁夏南部山区降水量、降水强度、降水日数的特征变化趋势.结果表明:该区域主要降水类型为小雨且呈"单峰"形式,年降水量变化程度大于年降水日数,平均降水强度增加,极端降水事件增多;该区域平均降水自 20 世纪 90 年代左右有下降趋势,21 世纪 10 年代后有上升趋势,六盘山地区存在 39 a长期振荡、14 a中期振荡和 8 a短期振荡,固原市存在 34 a长期振荡和6 a短期振荡.
Abstract
This study is based on the daily precipitation data from the Liupan Mountain and Guyuan meteorological observation stations located in the southern mountainous region Ningxia.Using methods such as moving average,linear trend analysis,time series analysis,Mann Kendall(MK)test,and Morlet wavelet analysis,the study investigated rainfall characteristics and trends in the region over the past 50 years.The results show that:the main type of precipitation in the region is light rain,with a uni-modal pattern.The variability in annual precipitation is greater than that of the number of rainy days.The average precipitation intensity and the frequency of extreme rainfall events have increased.Average rainfall in the region has shown a downward trend since the 1990s,followed by an upward trend from the 2010s onward.The Liupan Mountain region exhibits long-term oscillations with a period of 39 years,medium-term oscillations of 14 years,and short-term oscillations of 8 years;the Guyuan city shows a 34-year long-term oscillation and a 6-year short-term oscillation.
关键词
降水特征/宁夏南部山区/暴雨/六盘山地区/固原市Key words
rainfall characteristics/southern Ningxia mountainous areas/rainstorm/Liupan Mountain region/Guyuan city引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据