摘要
降水是最重要的天气要素之一,是城市水文循环关键组成部分.本文运用5a滑动平均、小波变换及MannKendall趋势检验方法,选取北京市通州区51a(1966-2016年)逐日降水资料,分析了通州区在年、季、月尺度上的降水特性.结果表明:年降水量以0.44mm·a^-1的速率减少,且呈现出多个周期;降水量主要集中在夏季,占全年降水量的72.1%,且以2.33mm·a^-1的速率减少,春季和秋季降水呈增加趋势,增加的趋势分别为0.36和1.12mm·a^-1,冬季的变化趋势最弱,以0.03mm·a^-1的趋势减小;月降水量主要集中在7和8月,占全年的50%以上,且分别以0.88和1.68mm·a^-1的速率减少,降水量在12、1和2月没有变化的趋势.日降水量大于10和20mm的降水事件主要集中在夏季,降水时间减少是夏季降水减少的主因.
Precipitation is one of the most important meteorological factors and a key component in the urban hydrological cycle.In this study,five-year moving average,wavelet transformation and Mann-Kendall trend tests were applied to analyze daily precipitation data over 51 years from 1966-2016 to characterize precipitations in Tongzhou on annual,seasonal and monthly scales.It was found that annual precipitation decreased at a rate of 0.44 mm per year with multiple cycles;the precipitation was mainly concentrated in the summer,accounting for 72.1%of total annual precipitation and decreasing at a rate of 2.33 mm per year.The trend was found to be increasing in spring and autumn,with an increasing trend of 0.36 and 1.12 mm·a^-1 respectively.The trend in winter was the weakest,decreasing with a trend of 0.03 mm·a^-1.Monthly precipitation was found to be mainly concentrated in July and August,accounting for more than half of the total in a year,with a reducing trend of 0.88 and 1.68 mm respectively.Precipitation hardly changed at all in January,February or December.Precipitation events with daily precipitation≥10 and 20 mm were found to be mainly concentrated in summer-a decrease in the number of precipitation days was the main cause of reduced summer precipitation.
作者
左斌斌
徐宗学
任梅芳
李鹏
ZUO Binbin;XU Zongxue;REN Meifang;LI Peng(College of Water Sciences,Beijing Normal University,Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology,100875,Beijing,China)
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第5期556-563,共8页
Journal of Beijing Normal University(Natural Science)
基金
变化环境下城市暴雨洪涝灾害成因资助项目(2017YFC150270)
北京市科学技术委员会2017年度创新基地培育与发展专项课题资助项目(Z171100002217080)
