[1]LIU Yinge,HU Haonan,ZHOU Huanhuan,et al.Characteristics of Drought and Flood Events in the Weihe River Basin in the Past 200 Years[J].Research of Soil and Water Conservation,2019,26(04):217-223.
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Characteristics of Drought and Flood Events in the Weihe River Basin in the Past 200 Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 04
Page number:
217-223
Column:
Public date:
2019-06-11
- Title:
- Characteristics of Drought and Flood Events in the Weihe River Basin in the Past 200 Years
- Keywords:
- climatology; drought and flood sequence; wavelet analysis; Weihe River Basin; change characteristics
- CLC:
- P467
- DOI:
- -
- Abstract:
- By collecting and sorting out the data of drought and flood disasters in Weihe River Basin from 1813 to 2017, and reconstructing the drought and flood index and exponential sequences, this paper uses the methods of indexing, moving average, moving t test and wavelet analysis to analyze the variation of drought and flood in Weihe River Basin in recent 200 years. The results showed that there were 111 events of floods and droughts in Weihe River Basin in the past 200 years, 55 events of floods and 36 events of droughts, respectively, and 20 events of floods and droughts occurred alternately in the same year. The frequency of floods and droughts decreased in the order: mild drought > moderate drought > mild flood > alternation of droughts and floods > moderate floods > major floods and droughts. The occurrence of drought and flood disasters had obvious stages, moderate and severe drought-prone periods occurred in the period of 1833—1880 and 1914—1933, moderate and severe flood-prone periods occurred in the period of 1894—1910 and 1933—1939. There were periodic shocks of 5~7 years, 10~11 years, 18~20 years, 60 years and 105~110 years in the evolution of drought and flood. The period oscillation around 110 years was the strongest, which was the first main period, the second main period was 60 years, and the third main period was 20 years. At the same time, five mutation years of drought and flood were detected, which occurred in 1825, 1881, 1914, 1933 and 1981, respectively. With respect to spatial distribution, the highest drought frequency was found in Guanzhong Basin, followed by Tianshui and Tongchuan, and the lowest on was found in the source of Weihe River. The highest frequency of floods was observed in Xi’an and Weinan, followed by Tianshui, Baoji and Xianyang, and the lowest frequency was found in Weiyuan and Tongchuan.
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1900-01-01