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 language | English |
|---|---|
| Title of host publication | 2018 UKM FST Postgraduate Colloquium |
| Subtitle of host publication | Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium |
| Editors | Noor Hayati Ahmad Rasol, Kamarulzaman Ibrahim, Siti Aishah Hasbullah, Mohammad Hafizuddin Hj. Jumali, Nazlina Ibrahim, Marlia Mohd Hanafiah, Mohd Talib Latif |
| Publisher | American Institute of Physics Inc. |
| ISBN (Electronic) | 9780735418431 |
| DOIs | |
| Publication status | Published - 27 Jun 2019 |
| Event | 2018 UKM FST Postgraduate Colloquium - Selangor, Malaysia Duration: 4 Apr 2018 → 6 Apr 2018 |
Publication series
| Name | AIP Conference Proceedings |
|---|---|
| Volume | 2111 |
| ISSN (Print) | 0094-243X |
| ISSN (Electronic) | 1551-7616 |
Conference
| Conference | 2018 UKM FST Postgraduate Colloquium |
|---|---|
| Country | Malaysia |
| City | Selangor |
| Period | 4/4/18 → 6/4/18 |
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ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Ecology
- Plant Science
- Physics and Astronomy(all)
- Nature and Landscape Conservation
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - The exploration of time scale dependency behaviour in Peninsular Malaysia rainfall data
AU - Saad, Siti Mariam
AU - Jemain, Abdul Aziz
AU - Ismail, Noriszura
PY - 2019/6/27
Y1 - 2019/6/27
N2 - 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.
AB - 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.
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U2 - 10.1063/1.5111226
DO - 10.1063/1.5111226
M3 - Conference contribution
T3 - AIP Conference Proceedings
BT - 2018 UKM FST Postgraduate Colloquium
A2 - Rasol, Noor Hayati Ahmad
A2 - Ibrahim, Kamarulzaman
A2 - Hasbullah, Siti Aishah
A2 - Jumali, Mohammad Hafizuddin Hj.
A2 - Ibrahim, Nazlina
A2 - Hanafiah, Marlia Mohd
A2 - Latif, Mohd Talib
PB - American Institute of Physics Inc.
ER -