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[1]CHU Chunjie,ZHOU Jinfeng.Extreme and Persistent Feature of Drought-Flood Evolution in Henan Province During 1960-2018[J].Research of Soil and Water Conservation,2022,29(03):164-171.

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Extreme and Persistent Feature of Drought-Flood Evolution in Henan Province During 1960-2018

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 03 Page number: 164-171 Column: Public date: 2022-04-20

Title:: Extreme and Persistent Feature of Drought-Flood Evolution in Henan Province During 1960-2018

Author(s):: CHU Chunjie, ZHOU Jinfeng; (College of Tourism and Planning, Pingdingshan University, Pingdingshan, Henan 467000, China)

Keywords:: drought-flood evolution; extreme drought-flood; persistent drought-flood; Henan Province

CLC:: P467

DOI:: -

Abstract:: In order to explore the variation law of drought-flood in Henan Province and its driving factors, based on the daily precipitation and temperature data of 17 national meteorological stations in Henan Province during the period from 1960 to 2018, spatiotemporal variation of drought and flood in Henan Province was systematically analyzed on multi-time scale by using homogenized drought-flood index of precipitation and latent evaporation. The results showed that:(1)drought and flood in Henan Province showed oscillatory fluctuation and significant drought trend in 1960—2018; the degree of waterlogging was the strongest in 1980s, but the climate tended to be dry after mid-1990s, and the drought trend would continue to increase in the future; the climate in four seasons showed different degrees of drought trend, especially in spring and autumn, and there was no significant drought trend in summer and winter; the annual and seasonal drought-flood evolutions in Henan Province generally had 3～5 years periodicity, 7～8 years periodicity in autumn, and 13～14 years periodicity in whole year, spring, summer and winter, respectively;(2)the drought and flood in Henan Province showed a widespread-regional drought trend in whole year and autumn, especially in the contiguous areas along the Yellow River such as Kaifeng, Zhengzhou and Xinxiang; there was no obvious drought-flood trend in summer, and the drought trend in winter and spring showed different localization;(3)after mid-1990s, the frequency of extreme drought in Henan Province increased rapidly, and the trend of contiguous and regional drought was significantly enhanced; however, extreme flood decreased significantly; extreme droughts and floods were less in winter, and the highest frequency occurred in summer; annual and seasonal extreme droughts and floods showed regular differences in spatial distribution;(4)the increase of persistent drought events in Henan Province since mid-1990s had become an inevitable trend; the number, intensity and duration of persistent drought events were far more than those in past, while persistent flood events significantly reduced after mid-1990s; the occurrence and evolution of two events in past 59 years were basically anti-synchronous. The evolution of drought and flood in Henan Province shows a significant drought trend, and shows the distribution characteristics of drought trend in widespread region. The increase and enhancement of extreme drought and persistent drought events has become an inevitable trend.

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Last Update: 2022-04-20