Modelling Catchment Rainfall Using Sum of Correlated Gamma Variables

Roslinazairimah, Zakaria and Howlett, P. G. and Piantadosi, J. and Boland, J. W. and Nor Hafizah, Moslim (2013) Modelling Catchment Rainfall Using Sum of Correlated Gamma Variables. Jurnal Teknologi (Sciences and Engineering), 63 (2). pp. 85-88. ISSN 0127-9696 (print); 2180-3722 (online). (Published)

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One of the major difficulties in simulating rainfall is the need to accurately represent rainfall accumulations. An accurate simulation of monthly rainfall should also provide an accurate simulation of yearly rainfall by summing the monthly totals. A major problem in this regard is that rainfall distributions for successive months may not be independent. Thus the rainfall accumulation problem must be represented as the summation of dependent random variables. This study is aimed to show if the statistical parameters for several stations within a particular catchment is known, then a weighted sum is used to determine a rainfall model for the entire local catchment. A spatial analysis for the sum of rainfall volumes from four selected meteorological stations within the same region using the monthly rainfall data is conducted. The sum of n correlated gamma variables is used to model the sum of monthly rainfall totals from four stations when there is significant correlation between the stations.

Item Type: Article
Uncontrolled Keywords: Rainfall model; correlated gamma; catchment rainfall
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 17 Nov 2015 08:08
Last Modified: 28 Jun 2018 08:27
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