Study on the evolution of droughts and floods in the Yangtze River basin based on the standardized precipitation evapotranspiration index
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Abstract:
In order to investigate the change tendencies of the droughts and floods in the Yangtze River basin, we used the standardized precipitation evapotranspiration index on multiple time scales, based on the monthly precipitation and average temperature data from the 133 meteorological stations in the whole basin during 1970-2012. The results showed that the overall drought conditions in the Yangtze River basin were not serious, while the drought tendency was prominent. Compared to the upstream region, the middle and lower reaches of the Yangtze River basin had a more prominent drought tendency, especially on longer time scales. In addition, the analysis of typical extreme meteorological events showed that the standar dized precipitation evapotranspiration index could well reflect the floods and droughts in the Yangtze River basin on different time scales. This suggests that the index can be used to precisely evaluate the extents and distributions of the hydrological regimes in this basin.
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