陕西水利Issue(3)：18-21,4.
天山北坡中部近53 a主汛期降水时空分布特征分析
Analysis of the Spatial and Temporal Distribution Characteristics of Precipitation during the Main Flood Season over the Central Northern Slope of Tianshan Mountains for Nearly 53 Years
摘要
Abstract
Daily precipitation data from June to August(the main flood season)between 1971 and 2023 were selected from nine national meteorological observation stations in the central northern slope of the Tianshan Mountains.Daily rainfall was categorized into six levels,and linear regression and climatic trend rate methods were used to analyze changes in the number of rainy days and precipitation amounts at each station.The results show that:(1)Over nearly 53 years,Tianchi had the highest number of rainy days during the main flood season with an annual average of 34.4 days,while Caijiahuhu had the lowest with only 17.9 days.The spatial distribution of rainy days showed a clear pattern of fewer days in the north and more in the south,with fewer days in low-altitude areas in the north compared to high-altitude areas in the south.In terms of temporal distribution,the pattern is unimodal with the most rainy days occurring in July;(2)Except for Jimusaer,all stations showed a decreasing trend in the number of rainy days.With regard to the proportion of rainy days at different rainfall levels,as the rainfall intensity increased from light rain to heavy rainstorms,the proportion decreased;(3)Apart from Changji,Fukang,and Tianchi,which showed decreasing trends,the other stations experienced increasing precipitation trends.Except for Tianchi and Mulai,light rain had the greatest impact on the total rainfall during the main flood season,accounting for more than 30％of the six rainfall levels.For western stations,the smallest proportion was heavy rainstorms,while for central and eastern stations it was drizzle.关键词
天山北坡中部/主汛期/降水/时空分布Key words
Central northern slope of tianshan mountains/main flood season/precipitation/spatial and temporal distribution分类
天文与地球科学引用本文复制引用
简咏梅,李建刚..天山北坡中部近53 a主汛期降水时空分布特征分析[J].陕西水利,2025,(3):18-21,4.基金项目
国家自然科学基金(U2003106) （U2003106）
