Extreme rainfall patterns for sg. Sarawak and Samarahan river basins
Rainfall patterns and frequency analysis are carried out based on rainfall data extracted from 23 rainfall stations in Sg. Sarawak and 7 rainfall stations in Samarahan basin. In this study, Daily Maximum Rainfall (DMR) and Monthly Mean Rainfall (MMR) data has been used for rainfall pattern analys...
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| Format: | Final Year Project Report / IMRAD |
| Language: | English English |
| Published: |
Universiti Malaysia Sarawak, UNIMAS
2009
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/4539/ http://ir.unimas.my/id/eprint/4539/1/Wan%20Ahmad%2824pgs%29.pdf http://ir.unimas.my/id/eprint/4539/2/Wan%20Ahmad.pdf |
| Summary: | Rainfall patterns and frequency analysis are carried out based on rainfall data
extracted from 23 rainfall stations in Sg. Sarawak and 7 rainfall stations in Samarahan
basin. In this study, Daily Maximum Rainfall (DMR) and Monthly Mean Rainfall
(MMR) data has been used for rainfall pattern analysis whereas rainfall frequency
analysis procedure is applied only for DMR data. The objectives of this study are to
constructing the extreme rainfall region map based on frequency analysis reduced
variate curves which is the better plotting formula fit to Extreme Value Type I (EVI)
distribution either plotting position formulae Gringorten and Weibull formula using
Geographic Information System (GIS) application. Besides, these study also to
determine the factors influencing the rainfall distribution in Sg. Sarawak basin and
Samarahan basin. From the results and analysis, the rainfall distribution in coastal areas
of Sg Sarawak basin is influencing by prevailing wind during northeast monsoon season
where a regime of one maximum and minimum rainfall distribution can be observed.
Meanwhile, those inland is less likely influenced where the rainfall is distributed quite
evenly throughout the year. The results obtained from rainfall frequency analysis
showed that the Gringorten formula gives least ratio than Weibull formula which is in
accordance to previous study and literature review. From this result, frequency analyses
in reduced variate graph are plotted for both basins and then the extreme rainfall region
map are constructed using Geographic Information System (GIS) based on the graph. |
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