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Probability distribution of rainfall depth at hourly time-scale

Shamsudin , Supiah and Dan’azumi , Salisu (2010) Probability distribution of rainfall depth at hourly time-scale. In: International Conference on Environmental Science and Engineering, Singapore, 26-28 Aug 2010, Singapore.

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Official URL: http://www.waset.org/journals/waset/v72/v72-137.pd...

Abstract

Rainfall data at fine resolution and knowledge of its characteristics plays a major role in the efficient design and operation of agricultural, telecommunication, runoff and erosion control as well as water quality control systems. The paper is aimed to study the statistical distribution of hourly rainfall depth for 12 representative stations spread across Peninsular Malaysia. Hourly rainfall data of 10 to 22 years period were collected and its statistical characteristics were estimated. Three probability distributions namely, Generalized Pareto, Exponential and Gamma distributions were proposed to model the hourly rainfall depth, and three goodness-of-fit tests, namely, Kolmogorov-Sminov, Anderson-Darling and Chi-Squared tests were used to evaluate their fitness. Result indicates that the east cost of the Peninsular receives higher depth of rainfall as compared to west coast. However, the rainfall frequency is found to be irregular. Also result from the goodness-of-fit tests show that all the three models fit the rainfall data at 1% level of significance. However, Generalized Pareto fits better than Exponential and Gamma distributions and is therefore recommended as the best fit.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:goodness-of-fit test, hourly rainfall, Malaysia, probability distribution
Subjects:Unspecified
Divisions:Others
ID Code:24196
Deposited By: Liza Porijo
Deposited On:01 Aug 2012 08:48
Last Modified:01 Aug 2012 08:50

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