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Chang’an University (长安大学) 2021

Characteristic Analysis of Extreme Meteorological and Hydrological Events in Weihe River Basin

袁业鹏

Titre : Characteristic Analysis of Extreme Meteorological and Hydrological Events in Weihe River Basin

Auteur : 袁业鹏

Grade : Master 2021

Université : Chang’an University (长安大学)

Résumé partiel
As the largest tributary of the Yellow River,the Weihe River Basin belongs to an arid and semi-arid climate zone.In recent years,extreme temperature and precipitation events such as high temperature,floods and droughts have occurred frequently,which has brought problems to the rational allocation of regional water resources and has become a constraint on the economic development of the Weihe River Basin.A "threshold".Therefore,actively carrying out the analysis of the temporal and spatial laws of extreme climate and hydrological events in the Weihe River Basin will help to understand the trend of future hydrological and climate change in the Weihe River Basin,and have certain reference significance for the rational allocation of water resources in the basin and flood prevention and mitigation in the future.The main results achieved are as follows :(1)Analysis of the temporal and spatial laws of extreme temperatures.Using the daily maximum and minimum temperature data of the Weihe River Basin from 1960 to 2008,10 representative extreme temperature indexes were calculated.The daily maximum,minimum data and extreme temperature index are analyzed for trend,persistence,abruptness,periodicity and spatial law.The results show that the overall daily high temperature of the basin shows a downward trend,and the daily low temperature trend is not significant ;the extreme low temperature is extreme and extreme The high temperature is on the rise and has a positive sustainability ;the daily maximum temperature mutations mostly occurred in the mid-1990 s,and the daily minimum temperature mutations mostly occurred in the 1960 s to the1970s ;most extreme temperature indexes have a long first main cycle 28a ;The spatial law shows that the high temperature in summer and warm winter in winter are more serious in the middle and lower reaches of the Weihe River.

Mots clés : Extreme temperature ;Extreme precipitation ;Extreme runoff ;Temporal and spatial characteristics ;Correlation;Weihe River Basin ;

Présentation (CNKI)

Page publiée le 18 mars 2022