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基于PDSI的渭河流域干旱变化特征

DOI: 10.13577/j.jnd.2014.0504, PP. 29-37

Keywords: Palmer干旱指数,渭河流域,干旱特征,小波分析

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Abstract:

根据渭河流域的气候特征与地理位置,利用该流域1961-2008年21个气象站的气象资料,重新修正了Palmer干旱指数,并利用Mann-Kendall检验以及Morlet小波分析方法计算分析了PDSI的变化特征。结果表明:渭河流域有较显著的变干趋势;有北部较南部干旱,西部较东部干旱的空间变化特征;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;小波分析表明渭河流域大约有22年左右的干湿变换周期,与太阳黑子磁性活动周期一致。

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