%0 Journal Article
%T The Impact of the Number of Adjoining Wet Days on the Distribution of Rainfall Amounts
%J Irrigation Sciences and Engineering
%I Shahid Chamran University of Ahvaz
%Z 2588-5952
%A Ababaee, Behnam
%A Sohrabi, Teymor
%A Mirzaee, Farhad
%D 2011
%\ 05/22/2011
%V 34
%N 1
%P 25-34
%! The Impact of the Number of Adjoining Wet Days on the Distribution of Rainfall Amounts
%K Rainfall classes
%K Rainfall amounts distribution
%K Adjoining wet days
%K Log likelihood ratio test
%R 10.22055/jise.2011.13277
%X The amount of daily rainfall for a solitary wet day (Class 0) is normally less than the rainfall for awet day that is enclosed by wet days on either side (Class 2). The same characteristics hold true forthe case of the first or last day of wet spells (Class 1) and there fore the rainfall here is found to besmaller than the Class 2 rainfall. In many regions, there exist large differences between these rainfallclasses. In this study, the daily rainfall data from 5 rain gauge stations in the north and northwest ofIran are classified to classes 0, 1 and 2 according to the number of adjoining wet days. To examinethe impact of adjoining wet days on the distribution of rainfall amounts, different distributions weretested with 3 different data sets: (1) all rainfall classes grouped together, (2) solitary wet days fittedseparately from other wet days, and finally (3) all rainfall classes separately. The results showed thatthe models which treat the rainfall classes separately are a better fit for all the 5 stations. The AkaikeInformation Criterion (AIC) values are significantly reduced as the rainfall data are split into rainfallclasses. Also, among 4 different distributions considered (Gamma, Lognormal, Mixed Exponentialand Weibul), mixed exponential distribution in most cases and lognormal distribution in one caseshowed better performances.
%U https://jise.scu.ac.ir/article_13277_da5b350f15ba5115be727b33e03ceccc.pdf