[1]LIU Congwei,HU Shanshan,ZHANG Tao,et al.Spatial and Temporal Characteristics of Drought in Baiyangdian Basin Based on SPI[J].Research of Soil and Water Conservation,2022,29(06):254-259,267.
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Spatial and Temporal Characteristics of Drought in Baiyangdian Basin Based on SPI
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 06
Page number:
254-259,267
Column:
Public date:
2022-10-20
- Title:
- Spatial and Temporal Characteristics of Drought in Baiyangdian Basin Based on SPI
- Keywords:
- SPI index; time scale; drought characteristics; temporal and spatial distribution; Baiyangdian Basin
- CLC:
- P426
- DOI:
- -
- Abstract:
- In order to explore the temporal and spatial evolution characteristics of drought in the Baiyangdian Basin, with a background of climate change, based on the 0.1° resolution precipitation grid data in the study area from 1979 to 2018, the Standardised Precipitation Index(SPI)at annual and seasonal scales and the Mann-Kendall trend test method were used to study the temporal and spatial evolution characteristics of drought frequency and drought area of the Baiyangdian Basin. The results showed that:(1)The frequency of light drought was the highest in the study area, and the frequency of moderate drought, severe drought, and extra drought was decreasing in order. Spring and summer were the seasons with higher drought frequency, extra drought was mainly distributed in autumn and winter.(2)The degree of drought in the study area showed an insignificant reduction trend at the annual scale, with the drought area being decreased slightly; the degree of drought in spring and summer showed an insignificant increasing trend, with the area of drought increase being minimal; additionally, the degree of drought in autumn and winter showed a significant slowing trend with the drought area being decreased significantly in autumn.(3)Light drought and moderate drought are widely distributed throughout the basin, and the occurrence frequency of the lower plain area is higher than that of the upper mountainous area. The northern and western parts of the Daqinghe mountainous area and the southeastern edge of the basin are areas with high incidence of severe drought, and extra drought. To conclude, the Baiyangdian watershed shows a trend of easing drought as a whole, but the drought in spring and summer may increase in the future.
- References:
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Last Update:
2022-10-20