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[1]YU Zexing,HU Guohua,CHEN Xiao,et al.Change in Extreme Precipitation in Liuyang River Basin During the Past 45 Years[J].Research of Soil and Water Conservation,2017,24(05):139-143.

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Change in Extreme Precipitation in Liuyang River Basin During the Past 45 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 05 Page number: 139-143 Column: Public date: 2017-10-28

Title:: Change in Extreme Precipitation in Liuyang River Basin During the Past 45 Years

Author(s):: YU Zexing¹, HU Guohua¹, CHEN Xiao¹, GU Qingfu², SHAO Quanxi^1,3, SONG Hehua⁴; 1. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. Hydrology & Water Resources Bureau of Hunan Province, Changsha 410007, China;
3. CSIRO Data, Floreat WA6014, Australia;
4. Hydrology & Water Resources Bureau of Changsha, Changsha 410014, China

Keywords:: extreme precipitation; Mann-Kendall test; morlet wavelet analysis; accumulative anomaly combined moving t test; Liuyang River Basin

CLC:: TV122⁺.1

DOI:: -

Abstract:: Based on daily precipitation data from 12 weather stations in Liuyang River Basin during the period of 1969—2013 and the percentile-based threshold method, the extreme precipitation indices were analyzed by using linear regression, moving average, Mann-Kendall test, accumulative anomaly combined with moving t test and Morlet wavelet. The results indicated that: (1) extreme precipitation, precipitation intensity and precipitation ratio displayed increasing trends at the rates of 7.3 mm/decade, 9.5 mm/d and 0.3%, respectively, while the number of extreme precipitation days represented a decreasing trend at the rate of -0.054 d/decade; (2) abrupt changes in the extreme precipitation and precipitation intensity were detected in 1991 and 1992, respectively, while the number of extreme precipitation days and the ratio of extreme precipitation ratio to the total precipitation amounts were not statistically significant; (3) the extreme precipitation indices had the main oscillation cycles of 7～8 years, 10～11 years and 25～27 years, respectively, together with clear alternation between dry and wet years. The results are of great importance in flood control and disaster reduction in Liuyang River Basin.

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