[1]CHU Chunjie,ZHANG Xiaolei,ZHOU Jinfeng.Evolution Characteristics of Short-Period Drought-Flood Abrupt Alternation Events in Henan Province from 1960 to 2018[J].Research of Soil and Water Conservation,2023,30(04):275-285.[doi:10.13869/j.cnki.rswc.2023.04.012.]
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Evolution Characteristics of Short-Period Drought-Flood Abrupt Alternation Events in Henan Province from 1960 to 2018
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
275-285
Column:
Public date:
2023-06-10
- Title:
- Evolution Characteristics of Short-Period Drought-Flood Abrupt Alternation Events in Henan Province from 1960 to 2018
- CLC:
- P467
- DOI:
- 10.13869/j.cnki.rswc.2023.04.012.
- Abstract:
- [Objective] This article aims to elucidate the spatiotemporal evolution patterns and trends of sudden changes in drought and flood disasters in Henan Province, and then to provide basis for quantitative identification, temporal and spatial evolution and disaster risk assessment of drought-flood abrupt alternation events in Henan Province. [Methods] Based on daily precipitation and temperature data of 17 national benchmark meteorological stations in Henan Province from 1960 to 2018, this study carried out multi-scale and systematic analysis on spatiotemporal variation of drought-flood abrupt alternation in Henan Province in the past 59 years by using monthly short-period drought-flood abrupt alternation index. [Results](1)The absolute value of drought-flood abrupt alternation index greater than 1.0 can be used as the identification threshold of drought-flood abrupt alternation events. The greater the absolute value is, the greater the intensity of drought-flood abrupt alternation is.(2)In the past 59 years, the interannual fluctuation of drought-flood abrupt alternation events had changed significantly, with obvious stage characteristics. The frequency of mild sharp turn events showed a slightly increasing trend, the frequency of moderate events showed no obvious trend, and other events showed a slightly decreasing trend. However, the intensity of drought-to-flood and flood-to-drought events increased slightly with the linear tendency rates of 0.011/a and 0.021/a, respectively, and the sharp turn intensity will continue to increase in the future.(3)There were the first main period of 15.0 a and the second period of 3.0 a in the drought-flood abrupt alternation events and their intensity. However, under the same cycle, the drought-to-flood events and the flood-to-drought events showed significant inverse changes.(4)The areas with high frequency and intensity of drought-flood abrupt alternation events mainly concentrated in the plain areas of eastern and southern Henan and the mountainous areas of western Henan. Among them, the eastern and southern plains of Henan had a greater hazard risk affected by geographical and ecological factors.(5)The early atmospheric circulation and sunspot activity are important signals for the prediction and early warning of drought-flood abrupt alternation. [Conclusion] Drought-to-flood and flood-to-drought are frequent in Henan Province, with obvious periodicity, and the intensity will continue to increase in the future. The disaster risk is high in the plain areas of eastern and southern Henan.
- References:
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Last Update:
2023-06-10