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[1]HOU Yule,ZHAO Jingbo.Analysis of Evolution of Drought and Flood Disasters in Songpan County Under Abrupt Climate Change Based on Z Index[J].Research of Soil and Water Conservation,2021,28(04):165-170.

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Analysis of Evolution of Drought and Flood Disasters in Songpan County Under Abrupt Climate Change Based on Z Index

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 165-170 Column: Public date: 2021-08-10

Title:: Analysis of Evolution of Drought and Flood Disasters in Songpan County Under Abrupt Climate Change Based on Z Index

Author(s):: HOU Yule¹, ZHAO Jingbo²; (1.Aba Teachers College, Wenchuan, Sichuan 623002, China; 2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China)

Keywords:: abrupt change of temperature; Z-index; evolution of drought and flood; sunspot; Songpan County

CLC:: P426.616;P338⁺.6

DOI:: -

Abstract:: In order to analyze the climate change and its evolution characteristics of drought and flood disasters in Songpan County, based on the meteorological data and sunspot observation data in Songpan County from 1960 to 2015, the law of temperature change, Z index drought and flood disaster change, the relationship between solar activity and drought and flood were studied. The results show that the average annual temperature in Songpan County showed a significant upward trend, and the annual change rate was 0.24℃/decade; the contribution rate of the annual extreme low temperature was greater than that of the average annual temperature rise in Songpan County; the abrupt change of average annual temperature occurred in 1994; after 1994, the growth rate of temperature increased; the annual average precipitation in Songpan County showed no obvious decreasing trend, and the precipitation fluctuated greatly; the precipitation increased in winter and spring, and decreased in summer and autumn; after abrupt climate change, the change of seasonal precipitation became more complicated; In recent 56 years, there have been 28 times of drought and flood in Songpan County, with an average of once every two years; there have been 14 events of floods and 14 events of droughts, the both of the frequency were 25%; the frequency of drought and flood disasters was higher after abrupt climate change. There is a close relationship between the drought and flood in Songpan County and the sunspot cycle, and there is a strong matching between the change of Z index and sunspot activity. In the year or before and after one year when the sunspot number reaches its peak, the Z index will also increase or decrease accordingly. The probability of drought and flood disaster is very high in sunspot extreme year and its vicinity. Disaster prevention and mitigation should be strengthened.

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Last Update: 2021-08-20