干旱区地理2024，Vol.47Issue(8)：1314-1326,13.DOI:10.12118/j.issn.1000-6060.2023.404
伊犁河流域近30a洪水灾害时空分布及孕灾环境特征研究
Spatial and temporal distribution of flood disasters and characteristics of disaster-prone environment in Ili River Basin in recent 30 years
摘要
Abstract
Based on the flood disaster data set of the Ili River Basin from 1990 to 2022,this study combined with disaster-prone environment factors,such as elevation and normalized vegetation index,to examine the spatial and temporal distribution of flood disasters and the characteristics of disaster-prone environment in the Ili River Ba-sin.This study analyzes the relationship between the occurrence rule of flood disasters and the disaster-prone en-vironment.The results reveal the following:(1)Flood disasters in the study area can be categorized into three types:rainstorm,snowmelt,and mixed floods(caused by rainstorm and snowmelt floods),with rainstorm flood being the most prevalent(80.0%)and snowmelt flood the least(3.4%).The spatial distribution of flood disasters is greater in the north than in the south,greater in the east than in the west,with Nilke County experiencing the most and Khorgas City the least.(2)Over the past 30 years,the frequency of flood disasters has shown a substan-tial interannual and interdecadal increasing trend,with an average annual occurrence of about 11.6·a-1.The high-est occurrence was in 2010(43),and the highest period was from 2000 to 2011(149).Flood disasters were most frequent in summer,followed by spring,and least frequent in autumn.They were most frequent in June(annual mean 3.3 times·a-1)and least frequent in October(annual mean 0.06 times·a-1).Rainstorm flood disasters were most frequent in summer(annual mean 9.3 times·a-1),most frequent in June(110 times),and least frequent in October(2 times).Mixed flood disasters were more frequent in spring and less frequent in summer,with the most in March(36 times)and at the least in July(8 times),with an average annual rate of 1.9 times·a-1;snowmelt flood was most frequent in March(12 times),only occurring in spring,with an average annual rate of 0.4 times·a-1.(3)The comprehensive distribution of disaster-prone environment sensitivity levels shows that all disaster-prone factors work together to affect the spatial distribution and intensity of flood disasters.More extremely sensitive ar-eas exist in Nilka,Tekes,Xinyuan,Zhaosu Counties and Khorgas City.Based on the spatial and temporal distribu-tion of flood disasters and the comprehensive distribution of the disaster-prone environment,flood disasters mostly occur in the eastern and northern parts of the basin,where the extremely and highly sensitive areas are distributed.关键词
伊犁河流域/洪水灾害/时空分布/孕灾环境Key words
Ili River Basin/flood disaster/spatiotemporal distribution/disaster-prone environment引用本文复制引用
古丽扎尔·莫明,杨莲梅,刘艳,李新国..伊犁河流域近30a洪水灾害时空分布及孕灾环境特征研究[J].干旱区地理,2024,47(8):1314-1326,13.基金项目
第三次新疆综合科学考察项目"伊犁河流域自然灾害调查评估"(2022xjkk0600)之课题"伊犁河流域暴雨洪水灾害调查评估"(2022xjkk0601)资助 （2022xjkk0600）
