Analysis on spatial and temporal distribution characteristics of rainfall and designed rainstorm frequency in Wenchuan County
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.
spatio-temporal distribution of rainfalldesigned rainstormstochastic storm transpositionWenchuan County
国家科技期刊平台
NSTL
万方数据
维普
