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《Journal of Chengdu University of Information Technology》 2013-01
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Comparative Analysis on Four Distribution Simulating Quarter Rainfall——Example for Yibin City

ZHANG Jing,NI Chang-jian,YUAN Shu-jie(Plateau Atmosphere and Environment Key Laboratory of Sichuan Province of Chengdu University of Information and Technology,Chengdu 610225,China)  
The probability of precipitation is an important part of weather forecast and drought and flood disasters risk assessment.Through the researches Comparative Analysis on Four Distribution Simulating Quarter Rainfall in Yibin,the authors expected to provide some scientific bases for the local disaster reduction and agricultural production.with 51 years' quarter precipitation data of Yibin city in Sichuan province for 1960-2010,normal distribution,Gamma distribution,logarithmic normal distribution,Pearson-Ⅲ distribution are applied to study the region's precipitation distribution characteristics.On this basis,the ordinary least square method is used for goodness of fit test of the four distribution functions.The results show that the four distribution functions all can be fit with quarter precipitation distribution of Yibin city.Through goodness of fit test shows that,the optimum fitting distribution function,in turn,are gamma distribution,normal distribution,logarithmic normal distribution and Pearson-Ⅲ distribution in each season.
【Fund】: 公益性行业(气象)科研专项基金资助项目(GYHY201006023)
【CateGory Index】: P426.613
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