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The modelled raindrop size distribution of Skudai, Peninsular Malaysia, using exponential and lognormal distributions.

Yakubu ML, Yusop Z, Yusof F - ScientificWorldJournal (2014)

Bottom Line: This study established five different parametric expressions describing the rain rate of Skudai; these models are idiosyncratic to the climate of the region.Sophisticated equipment that converts sound to a relevant raindrop diameter is often too expensive and its cost sometimes overrides its attractiveness.This research abrogates the concept of exclusive occurrence of convective storm in tropical regions and presented a new insight into their concurrence appearance.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental and Water Resources Management, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia ; Department of Civil Engineering, Faculty of Engineering, Kano University of Science and Technology, 713101 Wudil, Kano, Nigeria.

ABSTRACT
This paper presents the modelled raindrop size parameters in Skudai region of the Johor Bahru, western Malaysia. Presently, there is no model to forecast the characteristics of DSD in Malaysia, and this has an underpinning implication on wet weather pollution predictions. The climate of Skudai exhibits local variability in regional scale. This study established five different parametric expressions describing the rain rate of Skudai; these models are idiosyncratic to the climate of the region. Sophisticated equipment that converts sound to a relevant raindrop diameter is often too expensive and its cost sometimes overrides its attractiveness. In this study, a physical low-cost method was used to record the DSD of the study area. The Kaplan-Meier method was used to test the aptness of the data to exponential and lognormal distributions, which were subsequently used to formulate the parameterisation of the distributions. This research abrogates the concept of exclusive occurrence of convective storm in tropical regions and presented a new insight into their concurrence appearance.

Show MeSH
Modelled drop size distribution using exponential distribution density function.
© Copyright Policy - open-access
Related In: Results  -  Collection


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fig7: Modelled drop size distribution using exponential distribution density function.

Mentions: The exponential DSD model obtained from this study is compared with Marshall and Palmer [36] model at intensities of 4 mm h−1 and 25 mm h−1 as shown in Figure 7. The results of the two models are in agreement with maximum divergence at higher raindrop diameter. Thus, the models compare more than 70% at drop diameters of 4 mm or less. This is quite expected as the maximum drop diameter considered by Marshall and Palmer [36] is in the order of 4 mm. But both models approached a common value as the rain diameters approach zero. The model converges at N0 = 7627 corresponding to N  (D = 0) for all rain intensities considered in this study.


The modelled raindrop size distribution of Skudai, Peninsular Malaysia, using exponential and lognormal distributions.

Yakubu ML, Yusop Z, Yusof F - ScientificWorldJournal (2014)

Modelled drop size distribution using exponential distribution density function.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4121099&req=5

fig7: Modelled drop size distribution using exponential distribution density function.
Mentions: The exponential DSD model obtained from this study is compared with Marshall and Palmer [36] model at intensities of 4 mm h−1 and 25 mm h−1 as shown in Figure 7. The results of the two models are in agreement with maximum divergence at higher raindrop diameter. Thus, the models compare more than 70% at drop diameters of 4 mm or less. This is quite expected as the maximum drop diameter considered by Marshall and Palmer [36] is in the order of 4 mm. But both models approached a common value as the rain diameters approach zero. The model converges at N0 = 7627 corresponding to N  (D = 0) for all rain intensities considered in this study.

Bottom Line: This study established five different parametric expressions describing the rain rate of Skudai; these models are idiosyncratic to the climate of the region.Sophisticated equipment that converts sound to a relevant raindrop diameter is often too expensive and its cost sometimes overrides its attractiveness.This research abrogates the concept of exclusive occurrence of convective storm in tropical regions and presented a new insight into their concurrence appearance.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environmental and Water Resources Management, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia ; Department of Civil Engineering, Faculty of Engineering, Kano University of Science and Technology, 713101 Wudil, Kano, Nigeria.

ABSTRACT
This paper presents the modelled raindrop size parameters in Skudai region of the Johor Bahru, western Malaysia. Presently, there is no model to forecast the characteristics of DSD in Malaysia, and this has an underpinning implication on wet weather pollution predictions. The climate of Skudai exhibits local variability in regional scale. This study established five different parametric expressions describing the rain rate of Skudai; these models are idiosyncratic to the climate of the region. Sophisticated equipment that converts sound to a relevant raindrop diameter is often too expensive and its cost sometimes overrides its attractiveness. In this study, a physical low-cost method was used to record the DSD of the study area. The Kaplan-Meier method was used to test the aptness of the data to exponential and lognormal distributions, which were subsequently used to formulate the parameterisation of the distributions. This research abrogates the concept of exclusive occurrence of convective storm in tropical regions and presented a new insight into their concurrence appearance.

Show MeSH