RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2019, Vol. 28 >> Issue (06): 1422-1433.doi: 10.11870/cjlyzyyhj201906017

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Inhomogeneity Distribution of Different Types of Precipitation in the Yangtze River Basin

SUN Hui-hui1,ZHANG Xin-ping1,2,LI Zu-xian3,LIU Fu-ji4, SHANG Cheng-Peng1,LUO Zi-dong1,ZHOU Hui1   

  1. (1. College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China;
    2. Key Laboratory of Geospatial Big Data Mining and Application, Hunan Province, Changsha 410081, China;
    3. Weather Modification Office of Hunan Province, Changsha 410118, China; 
    4.Wuxi Vocational College of Science and Technology, Wuxi 214028, Jiangsu)
  • Online:2019-06-20 Published:2019-06-20

Abstract: Based on the daily precipitation data collected from 131 meteorological stations in the Yangtze River Basin during 1963-2016, precipitation-concentration degree (PCD) and precipitation-concentration period (PCP) of annual precipitation and heavy precipitation (extreme precipitation and rainstorm) were calculated, respectively. Meanwhile, the M-K nonparametric trend test and correlation analysis methods were used to analyze the inhomogeneity and the variation trend of precipitation in this area. The aims of this study are to characterize the inhomogeneity of different types of precipitation in this basin, and enhance our understanding of spatial and temporal distribution for heavy precipitation. The results showed that multi-year mean annual PCDDP and PCPDP increased from the lower to upper reaches. The variation trend of PCDDP was not significant. For PCPDP, its spatial variation trend was obviously different, an increasing trend occurred in the middle and lower reaches, while a decreasing trend appeared in the upper reaches. There was a significant positive correlation between annual precipitation and PCDDP, which mainly distributed in Sichuan Basin. The multi-year mean annual PCDEP and PCPEP and their variation trends were similar to that of PCDDP and PCPDP. The multi-year mean annual rainstorm precipitation (daily precipitation≥50 mm) decreased from the lower to upper reaches, while it was higher for Sichuan Basin than that in the surrounding area. The variation trend of rainstorm increased in the east of the Yangtze River Basin and decreased in Sichuan Basin. The multi-year mean annual PCDRP and PCPRP decreased from southeast to northwest of the Yangtze River Basin. However, PCDRP increased in Hubei, Guizhou and eastern Sichuan, and decreased in southeastern of the basin. An increasing trend (but not significant) for PCPRP was found in Jiangsu and Zhejiang, Anhui, Hunan and Guizhou, while a decreasing trend was observed in Sichuan and Yunnan. 


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