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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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近50年来淮河流域极端降水的时空变化及统计特征
DOI: 10.11821/xb201109005, PP. 1200-1210
Keywords: 淮河,极端降水,L-矩法,K-S检验
Abstract:
以淮河流域27个气象站点1960-2009年逐日降水观测资料为基础,选取年最大降水量序列(AM)和超门限峰值序列(POT),分析淮河流域年极端降水事件的时空变化趋势,研究淮河流域降水极值的统计特征。研究发现过去50年,淮河流域大多数站点年最大日降水量有增加的趋势,少数站点有减少的趋势,但增加和减少的趋势均不明显。从单个气象站点50年降水序列来看,年最大日降水事件发生的时间大多集中于20世纪60-70年代,且以汛期居多。利用L-矩法、K-S检验等方法,发现GEV和GP分布分别能够较好的拟合AM和POT序列。通过计算比较在不同重现期水平下的降水量,发现POT序列及其对应的GP分布能够更好的模拟淮河流域极端降水序列。
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