[1]XI Zhuxiang,YANG Xueyan,LIU Yuxi,et al.Characteristics of Extreme Precipitation Change from 1961 to 2017 in Songliao Basin[J].Research of Soil and Water Conservation,2019,26(03):199-203,212.
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Characteristics of Extreme Precipitation Change from 1961 to 2017 in Songliao Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 03
Page number:
199-203,212
Column:
Public date:
2019-04-12
- Title:
- Characteristics of Extreme Precipitation Change from 1961 to 2017 in Songliao Basin
- Keywords:
- extreme precipitation; temporal and spatial characteristics; percentile threshold; Songliao Basin
- CLC:
- P426.6
- DOI:
- -
- Abstract:
- In order to protect against floods and waterlogging in the background of climate warming, according to the daily precipitation data of Songliao Basin from 1961 to 2017, the characteristics of extreme precipitation in Songliao Rver Basin were analyzed by means of percentile, anomaly accumulation, Mann-Kendall, variation coefficient and so on. The results showed that the extreme precipitation threshold in Songliao basin was small in the northwest and large in the south; the extreme precipitation and precipitation frequency in Songliao basin were increasing from northwest to southeast, and the intensity of extreme precipitation was large in the middle and south and small in other places, and the ratio of extreme precipitation decreased from northwest to southeast, the extreme precipitation index mostly presentedthe trend of declining in the southwest and rising in the northeast; extreme precipitation mainly occurred in summer, accounting for 81.8% of the total number; at the beginning of the 1960s, the extreme precipitation index changed from strong to weak level, which began to strengthen after the mid-1980s and is in a strong phase now; the extreme precipitation and precipitation frequency increased from 1961 to 2017, but the intensity and ratio of extreme precipitation decreased; after the abrupt change of temperature, the extreme precipitation index decreased, and the coefficient of variation increased; at present, the extreme precipitation in Songliao Bbasin is at a strong stage, the extreme precipitation is large, the frequency is high, the intensity is large, and the variation coefficients of extreme precipitation index are increased after mutation, and instability and probability of extreme precipitation increase. Therefore, the extreme precipitation should be highly valued, relevant research should be strengthened in order to improve prevention and response ability.
- References:
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