1970-2017年西江流域降水特性分析  

Characteristics of precipitation in Xijiang River basin from 1970 to 2017

作　　者：苏恒 徐宗学[1,2] 李鹏 叶陈雷[1,2] 王京晶 SU Heng;XU Zongxue;LI Peng;YE Chenlei;WANG Jingjing(College of Water Sciences,Beijing Normal University,Beijing 100875;Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology,Beijing 100875)

机构地区：[1]北京师范大学水科学研究院,北京100875 [2]城市水循环与海绵城市技术北京市重点实验室,北京100875

出　　处：《水力发电学报》2021年第6期51-61,共11页Journal of Hydroelectric Engineering

基　　金：科技基础资源调查专项(2019FY101901)。

摘　　要：基于西江流域37个气象站点1970—2017年逐日降水数据,采用滑动平均、Mann-Kendall趋势检验、Sen’s坡度、小波变换及经验正交分解等方法分析了流域降水时空演变特性。结果表明,西江流域年降水量呈不显著的减少趋势,以29年为主周期,空间分布呈现由东向西、由北向南递减的趋势。年内降水主要集中在夏季,冬季占比最小;春、秋降水量呈减少趋势,夏、冬呈增加趋势,只有春季降水量减少趋势较显著;6月降水量最大,12月—翌年2月各月降水量相近且较小。降水集中程度较高,降水集中度(PCD)与降水集中期(PCP)空间分布均呈由西向东递减的趋势,PCD与PCP第一、二模态空间分布均不具有一致性和方向分异性,可能与流域降水成因多样性有关。Based on the 1970-2017 daily precipitation data at 37 meteorological stations over the Xijiang River basin,temporal and spatial characteristics of the precipitation in this basin are analyzed using the moving average method,Mann-Kendall trend test,Sen's slope,wavelet transform,and empirical orthogonal function.Results indicate that the annual precipitation in the basin showed an insignificant decreasing trend,with a dominant cycle of 29 years,and a spatial distribution featured with a decreasing trend from east to west and north to south.In a year,most of the precipitation was concentrated in summer,and the winter season contributed the smallest proportion.It showed a decreasing trend in spring and autumn while an increasing trend in summer and winter,but the trend was significant only in spring.The precipitation was the greatest in June and showed small values of insignificant variations over the period of December to February.The precipitation concentration degree(PCD)was generally considerable large.The spatial distributions of PCD and precipitation concentration period(PCP)decreased from west to east,but their first and second modal coefficients did not show consistent or anisotropic feature in spatial distribution probably owing to the diversified causes of precipitation.

关 键 词：西江流域 降水 时空分布 降水集中度 降水集中期 

分 类 号：P426[天文地球—大气科学及气象学] P458.2