摘要
基于淮河流域渠北地区6个站点1956—2017年月降水数据,计算各站点降水年内分配不均匀系数、降水集中度和降水集中期等降水年内分配指标,分别采用Mann-Kendall方法和线性回归法分析各指标年际变化及随降水年型变化趋势,并进一步分析各指标随降水年型变化成因。结果表明:淮河流域渠北地区降水年内分配不均匀系数、降水集中度和降水集中期在时间上呈波动变化,未有显著线性趋势和突变点。随降水年型变丰,降水年内分配不均匀系数和降水集中度有增加的趋势,主要原因在于降水更加集中于6—9月,而年内1—5月和10—12月降水占比有所降低;降水集中期未有随年型线性变化的趋势,主要原因在于6—9月单个月份降水占比随降水年型变化趋势不显著。
Based on the monthly precipitation data of 6 stations in Qubei area of Huaihe River Basin from 1956 to 2017,the indi⁃ces representing the annual precipitation distribution,such as unevenness coefficient,concentration degree and concentration peri⁃od,were calculated.Then the inter-annual trends of those indices and their variations with yearly precipitation patterns were ana⁃lyzed by the Mann-Kendall method and linear regression method,and the reasons for these variations were also discussed.The re⁃sults show that all the indices have some fluctuations across time,but neither significant linear trend nor abrupt change appeares.The unevenness coefficient and concentration degree of intra-annual precipitation distribution exhibits a trend to increase with the increase of yearly precipitation,mainly because the precipitation proportion decreases in January to May and October to December while increases in June to September.In contrast,the precipitation concentration period shows no apparent trend varying with year⁃ly precipitation pattern,due to insignificant change of the monthly precipitation proportion in June to September.
作者
闫中月
陆小明
徐静
YAN Zhongyue;LU Xiaoming;XU Jing(MOE Key Laboratory of Surficial Geochemistry,Nanjing University,Nanjing 210023,China;School of Earth Sciences and Engi⁃neering,Nanjing University,Nanjing 210023,China;Hydrology and Water Resources Investigation Bureau of Jiangsu Province,Nanjing 210029,China)
出处
《三峡生态环境监测》
2020年第2期54-63,共10页
Ecology and Environmental Monitoring of Three Gorges
基金
国家水体污染控制与治理科技重大专项(2017ZX07602-003)。
