Temporal and Spatial Evolution Characteristics of Extreme Precipitation in the Yellow River Basin
To provide reference basis for agricultural production and flood control and disaster reduction,the study aims to explore the temporal and spatial evolution patterns of extreme precipitation in the Yellow River ba-sin.Based on the multi-source weighted ensemble precipitation data set of the Yellow River basin from 1979 to 2020,the linear regression method,Mann-Kendall test method,Pearson correlation coefficient method and Theil-Sen slope estimation method are employed to analyze the temporal and spatial evolution characteristics of nine extreme precipitation indices,which includes the maximum daily precipitation(RX1day),the maximum 5-day precipitation(RX5day),the heavy precipitation(R95p),the extremely heavy precipitation(R99p),the total precipitation(PRCPTOT),the precipitation intensity(SDII),the number of days with moderate rain(R10),the number of days with heavy rain(R20)and the number of days with torrential rain(R25).The results are shown as follows.On the time scale,RX1day,R99p,SDII and R20 in the Yellow River basin show a downward trend,while RX5day,R95p,PRCPTOT,R10 and R25 show an upward trend.In the upper reaches of the Yellow River,RX1day shows a downward trend,while the other eight extreme precipitation indices all show an upward trend.In the middle reaches of the Yellow River,the nine extreme precipitation indices show a downward trend.In the low-er reaches of the Yellow River,except for RX1day and RX5day which show an upward trend,the other extreme precipitation indices all show a downward trend.In terms of spatial distribution,the nine extreme precipitation in-dices generally present a spatial distribution pattern of gradually decreasing from the southeast to the northwest.From the perspective of the influencing factors of extreme precipitation indices,all the extreme precipitation indi-ces in the Yellow River basin show extremely significant positive correlations,and there are certain correlations between the extreme precipitation indices and the atmospheric circulation factors.
extreme precipitationMSWEPtemporal and spatial evolutionthe Yellow River basin
万方数据
维普
