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为了详尽研究皇甫川流域降雨侵蚀力变化规律,基于皇甫川流域及周边15个雨量站1954—2004年日降雨资料估算降雨侵蚀力R值,并借助Mann-Kendall非参数检验法和Kriging空间插值法对流域R值时空变化特征进行分析。结果表明:1)皇甫川流域降雨侵蚀力R值与总降雨量和侵蚀性降雨量的时空变化特征大体一致,自西北向东南逐渐增大,同时R值等值线自西北向东南逐渐稀疏;2)R值年内分布十分集中,7、8月R值之和占到全年的72.4%,5—9月R值占到全年的96%以上;3)15个站点的R值变化趋势不同,9个站点R值呈增大趋势,其中仅2个站点增大趋势显著,而其余6个站点的R值呈减小趋势,其中也仅有2个站点减小趋势显著,对整个流域而言,51年间流域降雨侵蚀力R值与降雨量和侵蚀性降雨量变化一致,呈现不显著的减小趋势。
In order to study the variation law of rainfall erosivity in Huangfuchuan basin in detail, the rainfall erosivity R was estimated based on the daily rainfall data of 1554 rainfall stations in Huangfuchuan basin and surrounding areas in 1954-2004. By means of Mann-Kendall nonparametric test and Kriging method The spatio-temporal variation characteristics of R value in the basin are analyzed. The results show that: 1) R value of rainfall erosivity in Huangfuchuan Basin is roughly the same as that of total rainfall and erosive rainfall, and gradually increases from northwest to southeast. At the same time, R value isoline gradually sparse from northwest to southeast; 2) R value is very concentrated during the year, the sum of R values in July and August accounts for 72.4% of the whole year, R value in May-September accounts for more than 96% of the whole year; 3) R value trend of 15 stations R value of 9 sites showed an increasing tendency, of which only 2 sites increased significantly, while R values of the other 6 sites showed a decreasing trend, of which only 2 sites decreased significantly, The R value of rainfall erosivity in the past 51 years is consistent with that of rainfall and erosive rainfall, showing an insignificant decreasing trend.