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黄河流域汛期降水非均匀性变化规律研究

, PP. 92-100

Keywords: 集中度,集中期,旱涝,黄河流域

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Abstract:

降水的时间分配对水资源利用有很大影响,降水的分配不均匀更是季风气候区旱涝灾害的主要原因。利用黄河流域72个台站1960-2010年汛期(6-9月)的逐日降水资料,通过EOF,Morlet小波分析等方法分析了该地区近51年来汛期降水集中程度的变化规律,并定量研究了降水集中度与旱涝指数之间的关系。研究表明:黄河流域汛期降水分配具有明显的不均匀性,东北部地区的降水不均匀性和集中度以及降水集中度对旱涝的影响更加明显,应高度警惕极端强降水造成洪涝灾害,而西部地区的降水相对较少,因而进一步加重了西部的干旱;降水集中期表现出从东北向西南地区推进的规律,7月中旬是降水集中的主要时段,并存在年际及年代际变化。

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