Characteristics of precipitation in upper reaches of the Yangtze River and its temporal and spatial evolution
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Abstract:
Study on the characteristics of precipitation and its temporal and spatial evolution is of an important guiding significance for the development and utilization of water resources in the basin. Based on the precipitation data (1960-2014) from 80 meteorological stations in upper reaches of the Yangtze River, we studied the characteristics of precipitation. Besides, the temporal and spatial evolution was analyzed by drawing the spatial distribution map and using Mann-Kendall test, Pettitt test, Morlet wavelet analysis method. The results showed that, during 1960 to 2014, the mean annual precipitation depth of upper reaches of the Yangtze River was 900.8 mm and the mean annual precipitation volume was 8925.1 m3, the annual variation of precipitation was great, the ratio of extreme annual precipitation was 1.5 and reached 3.9 in winter, monthly and the seasonal mean precipitation was very uneven, and the precipitation in flood season accounted for more than 80%; spatially, precipitation was large in southeast and small in northwest; temporally, significant negative trend was detected in annual precipitation in upper reaches of the Yangtze River, and the abrupt change took place in 1985, the primary period of precipitation in upper reaches of the Yangtze River was 28a, 13a, 8a in the descending order of strength, and the period of precipitation in the partitions was mainly 28a.
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