Analysis of Drought Evolution Characteristics in the Zhangwei River Basin in Recent 55 years
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Abstract:
Based on the daily precipitation data at 11 meteorological stations in the Zhangwei River Basin during the period from 1957 to 2011, several SPI-based indices, including drought frequency, drought-affected area, drought severity and duration, and drought barycentric coordinates, have been selected to analyze the meteorological drought evolution before and after the precipitation mutation. The results showed that (1) precipitation mutation occurred in 1976, and the frequency and affected area of drought in the year scale have increased significantly from 20% and 23.2 % to 40% and 34.1% before and after precipitation mutation, respectively; (2) in the season scale, drought frequency and affected area decreased to some extent in the spring but increased greatly in both summer and autumn, and the drought frequency increased while affected area decreased in the winter; (3) the average drought duration and severity increased significantly in both the year and season scales, but decreased in the month scale; and (4) the drought barycentric coordinates showed insignificant change before and after the precipitation mutation.
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