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[1]MA Yongyong,LOU Panxing,HUI Ying,et al.Characteristics of Precipitation Variability in Different Geomorphic Types in Shaanxi Province During Recent 61 Years[J].Research of Soil and Water Conservation,2023,30(05):154-161.[doi:10.13869/j.cnki.rswc.2023.05.024.]

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Characteristics of Precipitation Variability in Different Geomorphic Types in Shaanxi Province During Recent 61 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 154-161 Column: Public date: 2023-08-10

Title:: Characteristics of Precipitation Variability in Different Geomorphic Types in Shaanxi Province During Recent 61 Years

Author(s):: MA Yongyong^1,2, LOU Panxing^1,2, HUI Ying^1,2, XIAO Yiqing^2,3, ZHENG Xiaohua^2,3, SUN Lu^1,2; (1.Meteorological Institute of Shaanxi Province, Xi'an 710016, China; 2.Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Shaanxi Meteorological Bureau, Xi'an 710016, China; 3.Shaanxi Meteorology Observatory, Xi'an 710015, China)

Keywords:: precipitation; precipitation days; geomorphic type; Shaanxi Province

CLC:: P467

DOI:: 10.13869/j.cnki.rswc.2023.05.024.

Abstract:: [Objective] The aim of this study is to explore the precipitation variation characteristics of main geomorphic types in Shaanxi Province, and to provide decision-making support for disaster prevention and reduction. [Methods] Based on the daily precipitation data of 82 meteorological stations in Shaanxi Province from 1961 to 2021, the characteristics of precipitation variability in different geomorphic types in Shaanxi Province were investigated by linear trend regression and moving average, and the mutation in the trend of the precipitation and its duration was tested by the Mann-Kendall method. [Results] The largest average annual precipitation and precipitation days were found in the mountainous landform region(851.88 mm and 195.92 d), whereas the lowest appeared in the wind erosion landform region(405.07 mm and 85.20 d). The annual precipitation trend was negative in loess highland, hill and tableland, and positive in other geomorphic areas. Summer precipitation accounted for the largest proportion, and showed increasing trend in all geomorphic areas except for tableland. The season with the largest precipitation days in all geomorphic areas was summer. The annual, spring and summer precipitation days in all geomorphic areas showed decreasing trends. A mutation was detected in the annual precipitation days trend in loess tableland areas during 1968. [Conclusion] The annual precipitation and annual precipitation days were larger in the southern region than that in the northern region of Shaanxi Province, and the summer precipitation in most of the geomorphological areas was increasing while the precipitation days were decreasing. In the future, the study of the mechanism of precipitation change should be strengthened.

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Last Update: 2023-08-10