汶川县降雨时空分布特征及设计暴雨频率分析
Analysis on spatial and temporal distribution characteristics of rainfall and designed rainstorm frequency in Wenchuan County
谢雅洁 1刘曙光 1周正正1
作者信息
- 1. 同济大学 土木工程学院,上海 200092
- 折叠
摘要
为减少降雨及设计暴雨时空异质性对汶川县造成的损失,揭示汶川县降雨时空分布特征与设计暴雨特征,基于2001～2020 年的GPM卫星降雨数据,采用Mann-Kendall等方法,从年、月、汛期、日等时间尺度和不同量级尺度,对汶川县降雨时空变化进行分析,并采用随机暴雨移置法(Stochastic Storm Transposition,SST)进行设计暴雨频率分析.结果表明:① 汶川县年总降雨量呈显著增长趋势,主要受汛期降雨变化影响.② 降雨空间分布不均匀,小雨主要分布在汶川县西南部,中到暴雨主要分布在汶川县东部.③ 基于随机暴雨移置法得到的设计降雨结果具有可靠性;随着降雨历时的增长,设计暴雨中心有从汶川县西南部向中东部移动的趋势;小重现期时,设计暴雨的空间分布不均匀性更为显著.研究成果可为汶川县暴雨洪涝防治提供参考.
Abstract
To reduce the loss caused by spatio-temporal heterogeneity of rainfall and designed rainstorm to Wenchuan County,and reveal the spatio-temporal distribution characteristics of rain fall and the characteristics of designed rainstorm in Wenchuan County,based on the GPM satellite rainfall data from 2001 to 2020,Mann-Kendall method are used to analyze the spatial and temporal changes of rainfall in Wenchuan County from time scales of year,month,flood season,day and different scales of magni-tude,and Stochastic Storm Transposition(SST)method is used to analyze the frequency of designed rainstorm.The results show that:① the annual total rainfall in Wenchuan County shows a significant growth trend,which is mainly affected by the rainfall changes in the flood season.② The spatial distribution of rainfall is uneven.Light rain is mainly distributed in the southwest of Wenchuan County,and moderate rain to rainstorm is mainly distributed in the east of Wenchuan County.③The designed rainfall results obtained based on SST method are reliable;with the increase of rainfall duration,the designed rainstorm center has a tend-ency to move from the southwest to the central and eastern part of Wenchuan County;the spatial non-uniformity of the designed rainstorm is more significant for small return period.The research results can provide reference for rainstorm and flood control in Wenchuan County.
关键词
降雨时空分布/设计暴雨/随机暴雨移置法/汶川县Key words
spatio-temporal distribution of rainfall/designed rainstorm/stochastic storm transposition/Wenchuan County引用本文复制引用
基金项目
国家重点研发计划(2018YFD1100401)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据