Daily rainfall disaggregation using HYETOS model for Peninsular Malaysia

Ibrahim Suliman Hanaish, Kamarulzaman Ibrahim, Abdul Aziz Jemain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

In this paper, we have examined the applicability of single site disaggregation model (HYETOS) based on the Poisson cluster model to disaggregate daily rainfall to hourly data using proportional adjusting procedure. In this study, the modified Bartlett Lewis Model (MBL) is fitted to the hourly rainfall depth from 1970 to 2008 available at the rain gauge station in Petaling Jaya. In addition, the synthetic hourly rainfall is generated by inputting the estimated parameters found based on MBL into the Hyetos model. The nature of occurrence of rainfall in Peninsular Malaysia comprising of very heavy rain during a short period of time contribute to the discrepancy between the synthetic data and the observed and expected data. When the disaggregated synthetic rainfall data is compared with the observed and expected data, it is found that the mean values for the three types of depths are quite closed; however, the synthetic data are quite different from the observed and expected depths when comparison is base on autocorrelation and standard deviation. The model is also validated by considering statistical property that was not used in the fitting procedure such as the extreme values. A comparison is also made between the extreme values based on the disaggregated model and the observed data. A bad fit in the extremes is found at all time scales considered, which are 1, 6 and 12 hour levels of aggregation. An underestimation of the disaggregated values is evident at all time scales.

Original languageEnglish
Title of host publicationInternational Conference on Applied Mathematics, Simulation, Modelling - Proceedings
Pages146-150
Number of pages5
Publication statusPublished - 2011
Event5th International Conference on Applied Mathematics, Simulation, Modelling, ASM'11 - Corfu Island
Duration: 14 Jul 201116 Jul 2011

Other

Other5th International Conference on Applied Mathematics, Simulation, Modelling, ASM'11
CityCorfu Island
Period14/7/1116/7/11

Fingerprint

Disaggregation
Malaysia
Rainfall
Rain
Extreme Values
Synthetic Data
Model
Time Scales
Rain gages
Period of time
Autocorrelation
Mean Value
Standard deviation
Statistical property
Discrepancy
Aggregation
Siméon Denis Poisson
Gauge
Extremes
Agglomeration

Keywords

  • Disaggregation
  • Hyetos
  • Poisson cluster processes

ASJC Scopus subject areas

  • Applied Mathematics
  • Modelling and Simulation

Cite this

Hanaish, I. S., Ibrahim, K., & Jemain, A. A. (2011). Daily rainfall disaggregation using HYETOS model for Peninsular Malaysia. In International Conference on Applied Mathematics, Simulation, Modelling - Proceedings (pp. 146-150)

Daily rainfall disaggregation using HYETOS model for Peninsular Malaysia. / Hanaish, Ibrahim Suliman; Ibrahim, Kamarulzaman; Jemain, Abdul Aziz.

International Conference on Applied Mathematics, Simulation, Modelling - Proceedings. 2011. p. 146-150.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hanaish, IS, Ibrahim, K & Jemain, AA 2011, Daily rainfall disaggregation using HYETOS model for Peninsular Malaysia. in International Conference on Applied Mathematics, Simulation, Modelling - Proceedings. pp. 146-150, 5th International Conference on Applied Mathematics, Simulation, Modelling, ASM'11, Corfu Island, 14/7/11.
Hanaish IS, Ibrahim K, Jemain AA. Daily rainfall disaggregation using HYETOS model for Peninsular Malaysia. In International Conference on Applied Mathematics, Simulation, Modelling - Proceedings. 2011. p. 146-150
Hanaish, Ibrahim Suliman ; Ibrahim, Kamarulzaman ; Jemain, Abdul Aziz. / Daily rainfall disaggregation using HYETOS model for Peninsular Malaysia. International Conference on Applied Mathematics, Simulation, Modelling - Proceedings. 2011. pp. 146-150
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