[1]Yang Tianzeng,Zhang Hongbo,Li Yangbing,et al.Spatiotemporal Variations of Meteorological Drought in the Beiluo River Basin from 1915 to 2020[J].Research of Soil and Water Conservation,2024,31(01):187-198.[doi:10.13869/j.cnki.rswc.2024.01.049]
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Spatiotemporal Variations of Meteorological Drought in the Beiluo River Basin from 1915 to 2020
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 01
Page number:
187-198
Column:
Public date:
2024-02-20
- Title:
- Spatiotemporal Variations of Meteorological Drought in the Beiluo River Basin from 1915 to 2020
- Keywords:
- meteorological drought; SPEI; spatial and temporal pattern; evolutionary characteristics; Beiluo River Basin
- CLC:
- P426.616
- DOI:
- 10.13869/j.cnki.rswc.2024.01.049
- Abstract:
- [Objective] The aims of this study are to reveal the century-scale drought evolution characteristics in typical areas of the Loess Plateau, couple with landform types to clarify the spatiotemporal variation of meteorological drought, and provide scientific and technological support for the comprehensive management of the Beiluo River Basin. [Methods] The annual standardized precipitation evapotranspiration index(SPEI)was calculated by using average temperature and precipitation data with a resolution of 1 km in the Beiluo River Basin from 1915 to 2020, and the spatiotemporal variations of meteorological drought in various landform types were examined by using the Theil-Sen Median trend analysis, Mann-Kendall test, wavelet analysis, and inverse distance weighted interpolation(IDW). [Results](1)The Beiluo River Basin's spatial distribution of temperature and precipitation was quite diverse, showing a general decreasing trend from southeast to northwest along with a top-to-bottom gradient distribution of temperature along the channel. The temperature was relatively high in the downstream area(terrace plain area)while there was comparatively little precipitation in the upstream area(the hilly-gully area).(2)Throughout the study period, the SPEI-12 of this basin changed dramatically, suggesting that drought occurrences appeared in cycles. Overall drought occurrences displayed the decreasing tendency in terms of quantity, with a decline rate of -0.04/decade. Among them, the trend turned in 1942, 1990, and 2010, with 1990 marking the biggest turning point. Drought cycle variations could be loosely separated into two periods: the period prior to 1960, when the primary cycles were the 10 years and 17 years, and the period following 1960, when the dominant cycles were the 3 years, 7 years, and 30 years. The 10-year and 30-year cycles predominated the basin drought fluctuations across the whole time span.(3)The reduction in SPEI-12 was increasing from the northeast to the southwest, indicating that the Beiluo River Basin was often experiencing weak drought. This decline was global, but not statistically significant.(4)In the time domain, the frequency of drought events varied substantially. The 2000 s could be seen the highest frequency of all types of drought events, with the upstream(hilly-gully area)and the downstream(terrace plain area)both reaching 70% and the midstream(rocky-mountain area and table-gully area)at about 60%. The 1990 s could be seen the highest frequency of severe and extreme drought.(5)Different types of droughts distributed differently. While the frequency of moderate droughts slowly rose from the south to the north, the frequency of mild droughts gradually reduced from the south to the north. In general, moderate droughts were more likely to occur in the upper parts of the Beiluo River Basin(the hills-gully area), whereas mild droughts were more likely to occur in the downstream sections(the terrace plain area). The probability of experiencing an acute drought was just 1.69 to 2.10% in the majority of the basin's high-incidence zones, which dispersed throughout the basin. [Conclusion] Drought trends caused by global warming have an objective impact on the Loess Plateau region. The high-frequency types of meteorological droughts in different geomorphic types of the Beiluo River Basin are slightly different. In the future, drought resistance and disaster reduction capabilities in the middle and lower reaches should be improved.
- References:
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Last Update:
2024-02-20