Analysis of daily rainfall during 2001-2012 in Thailand
Mayuening Eso1,2, Metta Kuning1,2*, and Somporn Chuai-Aree1,2
1 Department of Mathematics and Computer Science, Faculty of Science and Technology, Prince of Songkla University, Pattani Campus, Mueang, Pattani, 94000 Thailand.
2 Centre of Excellence in Mathematics, Commission on Higher Education, Ratchathewi, Bangkok, 10400 Thailand.
Received: 21 June 2014; Accepted: 3 November 2014
Abstract
The presented study aims to classify precipitation regions, analyze trends, and fit an appropriate model for daily precipitation in Thailand. Factor analysis and generalized linear model (GLM) with gamma regression are performed on the historical records of daily rainfall amounts from 114 weather stations during 2001 to 2012. The study shows that the factor analysis divides the area of Thailand into seven regions with explanation of 58.9% of the total variance. The conducted gamma models reveal a good fit for the upper part, south-east, and south-west of the examined regions. The deviance residual plots from these models also provide a reasonable fit.
Keywords: daily rainfall, daily precipitation, factor analysis, gamma regression, GLM
Songklanakarin J. Sci. Technol.
37 (1), 81-88, Jan. - Feb. 2015
