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[1]YANG Shaokang,LIU Ji,WEI Rong,et al.Differentiation Characteristics of Meteorological Drought in the Growing Season in the Upper Reaches of the Yangtze River Basin[J].Research of Soil and Water Conservation,2022,29(02):184-191.

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Differentiation Characteristics of Meteorological Drought in the Growing Season in the Upper Reaches of the Yangtze River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 184-191 Column: Public date: 2022-03-20

Title:: Differentiation Characteristics of Meteorological Drought in the Growing Season in the Upper Reaches of the Yangtze River Basin

Author(s):: YANG Shaokang^1,2,3, LIU Ji^1,2,3, WEI Rong^1,2,3, DONG Xiaohua^1,2,3, LIU Yanli^4,5, CONG Fangjie⁶; (1.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei443002, China; 2.Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei443002, China; 3.Hubei Collaborative Innovation Center for Water Resources Security, Wuhan430072, China; 4.State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing210098, China; 5.Research......)

Keywords:: standardized precipitation evapotranspiration index; rotated empirical orthogonal function; ensemble empirical mode decomposition; Upper Yangtze River Basin; theory of run; arid dispersion

CLC:: P332

DOI:: -

Abstract:: In order to reveal the occurrence and evolution of meteorological drought in the upper reaches of the Yangtze River, based on the monthly meteorological data of the weather station from 1961 to 2019, the methods of rotating orthogonal decomposition(REOF), ensemble empirical mode decomposition(EEMD)and run theory were used to study the characteristics of meteorological drought changes in the growth season. The results show that the upper reaches of the Yangtze River can be divided into 8 meteorological arid sub-regions, of which zone Ⅴ shows a drought trend, zone Ⅰ, zone Ⅲ, and zone Ⅶ show a humidification trend, and other regions become wet and dry alternately; the drought cycle is interannual. Mainly, region Ⅰ and region Ⅲ show obvious characteristics of interdecadal cycles, and region Ⅴ and region Ⅷ have higher trend contributions, and the contributions of the other regions are less than the interdecadal contributions; the period of drought in regionⅡ is the longest, reaching 1.57 months. Area Ⅶ has a minimum of 1.41 months, and only area Ⅶ shows a significant decrease in drought time. The drought intensity of each area is relatively close, and the future change trend is not obvious. Area Ⅶ has the largest arid area of each area, reaching 30.36%, and area of drought of area Ⅵ is the smallest, accounting for19.18%. On the whole, the most concentrated area of drought is area Ⅶ, with an AD of 0.091, and the most dispersed area is area Ⅱ, with an AD of 0.194. To sum up, the characteristics of meteorological drought in the growth season of each subregion in the upper reaches of the Yangtze River are different. The drought in the northwest is more severe than that in the southeast.

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Last Update: 2022-04-20