Characteristics of Drought Variations in Hanjiang Basin in 1961-2014 Based on SPI/SPEI
Abstract: To analyze the characteristics of drought variations in Hanjiang Basin, the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI) were calculated by using daily meteorological data (including precipitation, temperature, relative humidity, solar duration and wind speed) from 13 meteorological stations across Hanjiang Basin for 1961-2014. Results showed that: (1) in the past 54 years, the annual precipitation showed a non-significant downward trend, while the annual evapotranspiration presented a significant downward trend (−7.7 mm/10 a); the SPI index demonstrated a non-significant downward trend, and the SPEI index with a non-significant upward trend; (2) SPI values with 1-month scale had a larger fluctuation range than SPEI values, and the SPI/SPEI drought duration extended as the time scale prolong; (3) over 65% of the basin was drought-free in 1961-2014, and the drought-free cumulative probability decreased as time scale extended; (4) the driest year in Hanjiang Basin was 1966, with higher drought grade in southeast region than in northwest region overall, while the 1983 was the wettest year, with SPI/SPEI values decreased and then increased from northwest to southeast. When describing the drought grade at each station, drought grades based on SPEI were higher than SPI as a whole in the driest year, while drought grades based on SPI and SPEI were basically consistent in the wettest year in Hanjiang Basin.
文章引用: 陶新娥 , 陈 华 , 许崇育 (2015) 基于SPI/SPEI指数的汉江流域1961~2014年干旱变化特征分析。 水资源研究， 4， 404-415. doi: 10.12677/JWRR.2015.45050
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