The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data

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

Abstract

In the present study, we explore the evidence of time scale dependency in cascade generator of a discrete multiplicative random cascade model (MRC) with a long-term goal in mind to see its possible application in temporal rainfall disaggregation for Peninsular Malaysia rainfall. The scale-dependent behaviour of rainfall for time scales from 1 hour to 16 hours has been explored and characterized using the bounded random cascades, a microcanonical version of MRC model. Hourly rainfall observations at 56 rain gauge stations across the peninsula for, on average, a 35-year record period are employed in this study. The stations were grouped according to four regions to investigate the effect of the local climatology and topography on the scale-dependent behaviour. The findings showed that the parameters of microcanonical model are depended on time scales, particularly parameter related to the variability of the cascade generator. The variance of the cascade generator is substantially decreased with the increased of time scales; indicates that rain within an event is smoother at finer scales than at coarser scales. Meanwhile, the probability that intermittency will occur is smaller as the time scales increased; implies that at finer scales, a wet interval is more frequently distributed into both the first and the last half of intervals. The observations of both parameters are consistent since the low variance of the cascade generator has resulted from the densely arranged and evenly distributed rainy intervals - the low probability of the rainfall intermittency at finer scales. Results on the regional differences showed rainfall field in west region displayed a strong dependency of the variability parameter on time scales, and followed by northwest, east and southwest regions. Furthermore, the distribution of rain within an event at a fine scale in the west region is found to be as smooth as rainfall events in northwest and east regions, while rainfall events in the southwest region are mostly randomly distributed.

Original languageEnglish
Title of host publication2018 UKM FST Postgraduate Colloquium
Subtitle of host publicationProceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium
EditorsNoor Hayati Ahmad Rasol, Kamarulzaman Ibrahim, Siti Aishah Hasbullah, Mohammad Hafizuddin Hj. Jumali, Nazlina Ibrahim, Marlia Mohd Hanafiah, Mohd Talib Latif
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735418431
DOIs
Publication statusPublished - 27 Jun 2019
Event2018 UKM FST Postgraduate Colloquium - Selangor, Malaysia
Duration: 4 Apr 20186 Apr 2018

Publication series

NameAIP Conference Proceedings
Volume2111
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2018 UKM FST Postgraduate Colloquium
CountryMalaysia
CitySelangor
Period4/4/186/4/18

Fingerprint

Malaysia
meteorological data
timescale
rain
rainfall
generators (equipment)
cascades
generators
intermittency
intervals
rain gauges
stations
climatology
rain gages
gauge
topography
peninsulas
parameter

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

Cite this

Saad, S. M., Jemain, A. A., & Ismail, N. (2019). The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data. In N. H. A. Rasol, K. Ibrahim, S. A. Hasbullah, M. H. H. Jumali, N. Ibrahim, M. M. Hanafiah, & M. T. Latif (Eds.), 2018 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium [020019] (AIP Conference Proceedings; Vol. 2111). American Institute of Physics Inc.. https://doi.org/10.1063/1.5111226

The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data. / Saad, Siti Mariam; Jemain, Abdul Aziz; Ismail, Noriszura.

2018 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium. ed. / Noor Hayati Ahmad Rasol; Kamarulzaman Ibrahim; Siti Aishah Hasbullah; Mohammad Hafizuddin Hj. Jumali; Nazlina Ibrahim; Marlia Mohd Hanafiah; Mohd Talib Latif. American Institute of Physics Inc., 2019. 020019 (AIP Conference Proceedings; Vol. 2111).

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

Saad, SM, Jemain, AA & Ismail, N 2019, The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data. in NHA Rasol, K Ibrahim, SA Hasbullah, MHH Jumali, N Ibrahim, MM Hanafiah & MT Latif (eds), 2018 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium., 020019, AIP Conference Proceedings, vol. 2111, American Institute of Physics Inc., 2018 UKM FST Postgraduate Colloquium, Selangor, Malaysia, 4/4/18. https://doi.org/10.1063/1.5111226
Saad SM, Jemain AA, Ismail N. The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data. In Rasol NHA, Ibrahim K, Hasbullah SA, Jumali MHH, Ibrahim N, Hanafiah MM, Latif MT, editors, 2018 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium. American Institute of Physics Inc. 2019. 020019. (AIP Conference Proceedings). https://doi.org/10.1063/1.5111226
Saad, Siti Mariam ; Jemain, Abdul Aziz ; Ismail, Noriszura. / The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data. 2018 UKM FST Postgraduate Colloquium: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium. editor / Noor Hayati Ahmad Rasol ; Kamarulzaman Ibrahim ; Siti Aishah Hasbullah ; Mohammad Hafizuddin Hj. Jumali ; Nazlina Ibrahim ; Marlia Mohd Hanafiah ; Mohd Talib Latif. American Institute of Physics Inc., 2019. (AIP Conference Proceedings).
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