近60年来淮河流域强降雨时空变化特征.doc
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近60年来淮河流域强降雨时空变化特征
摘要:基于1951年-2009年淮河流域44个气象站逐日降水资料,运用小波分析、MannKendall突变检验法、克里金插值等方法对研究区暴雨集中度(PCD)、集中期(PCP)、暴雨量及降水总量进行时空变化特征分析。研究表明:淮河流域近60年来暴雨PCD和PCP增减幅度不明显,但暴雨量和降水总量呈明显的增长趋势,增长速度分别为264 mm/10 a 和1517 mm/10 a;变化周期上,暴雨集中度(PCD)主要呈现出5 a和10 a左右的震荡,暴雨集中期(PCP)呈现出明显的5 a和15 a左右的周期震荡,暴雨量和降水总量呈现出6~10 a的变化周期;暴雨集中度(PCD)、集中期(PCP)、降水总量和暴雨量都存在明显的突变年份;暴雨集中度空间分布上具有明显的不均衡性,基本从西向东,从南向北集中度呈增大趋势,年降水量较多的区域,降水集中度相对偏高,同样地年暴雨量较大的区域降水暴雨集中度相对偏高;暴雨集中期主要集中在7月中下旬,并且总体上在年内呈现从西北向东南暴雨集中期逐步推后;暴雨量与暴雨频次的相关系数达096,即两者具有类似的时空变化特征。
关键词:暴雨;降水集中度(PCD);降水集中期(PCP);时空特征;淮河流域
中图分类号:TV213.4 文献标志码:A 文章编号2015
Spatial and temporal variation characteristics of heavy rainfall in the Huaihe River Basin in recent 60 years
ZHOU Liangguang1,2,DAI Shibao1,2
(1.Chuzhou University,Chuzhou 239000,China;2.Collaborative Innovation Center of Geography
Information Integration Application in Anhui Province,Chuzhou 239000,China)
Abstract:Based on the daily precipitation data at 44 stations in the Huaihe River Basin from 1951 to 2009,we analyzed the spatial and temporal variation patterns of Precipitation Concentration Degree (PCD) and Precipitation Concentration Period (PCP) of rainstorm,heavy rainfall,and total precipitation in the study area using the methods such as wavelet analysis,MannKendall mutation test,,and kriging interpolation.The results showed that (1) the increasing trend of the rainstorm PCD and PCP is insignificant,but the amount of rainstorm and total precipitation show a significantly increasing trend with the rate of 264 mm/10 a and 1517 mm/10 a,respectively;(2) the periodicity of the PCD is approximately 5 years and 10 years,the periodicity of PCP is approximately 5 years and 15 years,and the periodicity of rainstorm and total precipitation is approximately 6 to 10 years in recent 60 years;(3) there are obvious mutation years for the PCD,PCP,rainstorm,and total precipitation;(4) the spatial distribution of rainstorm PCD is uneven in the river basin with the increas
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