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基于渭河流域1961—2008年21个气象站的气象资料,运用修正的Palmer干旱指数法分别计算各站逐月干旱指数,并分析该流域干旱的时空变化特性。结果表明:1961—2008年期间,渭河流域有较为显著的变干趋势;泾河是最容易发生干旱的地区,且干旱的程度最为严重;时间上,秋季发生干旱的可能性大;空间上,有北部较南部干旱,西部较东部干旱的空间变化特征。
Based on the meteorological data of 21 meteorological stations in the Weihe River basin from 1961 to 2008, the monthly Palmer drought index of each station was calculated using the modified Palmer drought index method, and the temporal and spatial variation characteristics of the drought in this basin were analyzed. The results showed that there was a significant trend of drying in the Weihe River Basin during 1961-2008. Jinghe River was the most prone to drought, with the most serious degree of drought. In time, there was a high possibility of drought in autumn. There are more northern arid and southern arid spatial variation.