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OALib Journal期刊
ISSN: 2333-9721
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中国次雨量特征及其区域分异
DOI: 10.11821/xb200903007, PP. 323-330
Keywords: 次降雨,&Gamma,分布,次雨量
Abstract:
基于统计方法的降雨随机模拟已成为目前许多地表过程模型的重要组成部分，但多以日降雨模拟为主。为了进行次降雨随机模拟，必须揭示次降雨的统计特征。本文利用中国62个气象站1954-2001年5-9月逐日小时降水资料，整理出能够刻画次降雨特性的基本指标，分析了我国次降雨的基本特征，并利用卡方检验方法，验证了我国次雨量主要服从两参数Γ分布，个别未通过检验的站点主要是由于对次雨量极值模拟效果不好所致。进一步选择Γ分布两参数和90%、95%、99%次雨量百分位共5个指标，采用K均值动态聚类法将我国次降雨特征划分为5个类型区域，由东南向西北呈带状分布，各区次雨量的偏态性、非均匀性和分散度依次减弱。利用5个区Γ分布两参数的区域化参数值，可生成任一站点次雨量随机模拟序列，对于地表过程定量研究具有重要意义。
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