Drought-flood temporal and spatial distribution in middle and downstream area of the Yangtze River over past 50 years
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Abstract:
The middle and lower reaches of the Yangtze River are important production bases of grains, cotton and oil crops in China, where droughts and floods occur frequently, which often result in the reduction of crop output. In this paper, based on the monthly meteorological data of 72 meteorological stations in the Yangtze River region, the temporal and spatial variation in droughts and floods of the Yangtze River region in near 50 years was analyzed using standardized precipitation index (SPI), empirical orthogonal function (EOF), and geo-statistical analysis combined with GIS technology. The results showed that the spatial distribution pattern of droughts and floods SPI3 in the Yangtze River region was almost the same in the whole region, but there was a difference in the south-north direction. Due to the climate, droughts and floods in Yangtze River region appeared alternately in summer and autumn, and the flood disaster occurred mainly in the critical period of growth and development of crop.
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