Risk Assessment and Regionalization of Drought Disaster in Yili River Basin Based on ERA5 Reanalysis Data
According to the distribution characteristics of ERA5 reanalysis data,a grid of 0.25°×0.25°was used as the basic unit for drought risk assessment.12 indicators were selected from four aspects of risk,fragility,vulnerability and disaster prevention and reduction ability,and the weights of the indicators were determined by AHP-entropy method.The drought disaster risk index model was constructed in the Yili River basin where basic data were scarce,and the drought disaster risk assessment and regionalization were carried out.The conclusions are as follows:1)The accuracy of ERA5 reanalysis precipitation data after time-segment correction is significantly improved,which can be used for drought disaster risk assessment.2)The second-highest and high-risk areas are mainly distributed in the northwest and northeast of the study area,the second-highest and high-vulnerability areas are mainly distributed in the mountainous areas at high-er altitudes,the second-highest and high-vulnerability areas are mainly distributed in Yining City and its surrounding are-as,and the second-highest and high-risk disaster prevention and mitigation capabilities are mainly distributed in the north-west of the study area,where accounted for 33.45%,31.04%,16.13%and 15.09%of the total area of the study area.3)The drought risk zoning map shows that the low and secondary low risk areas are mainly distributed in the southwest of the study area,while the secondary high and high risk areas are mainly distributed in the northwest of the study area,where accounted for 44.69%and 22.53%of the total area of the study area.
NETL
NSTL
万方数据
