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OALib Journal期刊
ISSN: 2333-9721
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水库调节地区东江流域非一致性水文极值演变特征、成因及影响
, PP. 851-858
Keywords: 频率分析,概率分布函数,极值流量,非一致性,东江流域
Abstract:
选用8种概率分布函数,以极大似然法估计函数参数,采用AIC、BIC和AICc模型选择准则选出最优分布函数,系统分析变化环境下东江龙川和河源2站的极值流量特征,并对年最大流量变化规律及其影响做有益探讨。结果表明降雨和水库蓄水工程是年最大流量显著下降的主要原因。龙川和河源站年最大流量LN2混尾分布拟合最好,变化环境后洪水频率最优分布线型基本保持一致,但流量变小造成分布参数改变已导致分布线型高水尾部特性变缓,相应设计流量偏小。用水文情势发生变化前估计的洪水重现期不能很好描述变化后洪水频率特征。
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