REGIONAL RAINFALL FREQUENCY ANALYSIS FOR SAMARAHAN RIVER BASIN
DOI:
https://doi.org/10.33736/jcest.442.2017Abstract
In planning to mitigate flood, it is essential for engineers to determine the magnitude and frequency of rainfall. The rainfall frequency and magnitude can be determined by rainfall frequency analysis. This study analyzes the regional rainfall frequency of the Samarahan River basin. There are 12 rainfall stations over the 508km2 of basin area, of which 11 are included in this study. The rainfall frequency analyses of each individual station in Samarahan River basin are conducted using Gumbel distribution and Weibull plotting position formulas. The curves that are close to each other are grouped into the same region. Other factors such as topography, station elevation, type of rainfall distribution and isohyet are also considered in determining the region. Subsequently, a regional rainfall frequency map of Samarahan River basin is established. The findings show that Samarahan River basin can be divided into three homogenous regions. In comparison to previous research, there are changes in grouping the rainfall stations selected into regions. These changes may be due to different years of data used and number of rainfall stations selected since the data is limited. Dissimilar outcomes may also be caused by other factors such as nature change over time. This research updates the rainfall analysis of the Samarahan River basin using more adequate data compared to previous research.
References
Ahmad, W. F. W. (2009). Extreme Rainfall Patterns for Sg. Sarawak and Samarahan River Basins. University of Malaysia Sarawak, Department of Civil Engineering, Malaysia.
Bernama. (2016, Feb 22). Flood victims in Sarawak increase to 7,931. The New Straits Times Online. Retrieved Feb 22, 2016, from https://www.nst.com.my/news/2016/02/128796/flood-victims-sarawak-increase-7931
Borneo Post. (2012, July 4). Betong and Miri worst hit by drought, suffer water shortage. Borneo Post Online. Retrieved July 4, 2012, from http://www.theborneopost.com/2012/07/04/betong-and-miri-worst-hit-by-drought-suffer-water-shortage/
Chow, V. T., Maidment, D. R., & Mays, L. W. (1988). Applied Hydrology. America: McGraw-Hill, Inc, New York.
Department of Irrigation and Drainage, Sarawak Hydrological Year Book 2014.
Hayward, D. & Clarke, R. T. (1996). Relationship between rainfall, altitude and distance from the sea in Freetown Peninsula, Sierra Leone. Hydrological Science Journal, 377-384.
https://doi.org/10.1080/02626669609491509
Johansson, B., & Chen, D. (2003). The influence of wind and topography on precipitation distribution in Sweden: Statistical analysis and modelling. International Journal of Climatology, 23(12).
https://doi.org/10.1002/joc.951
Raes, D. (2013). Thesis of Frequency Analysis of Rainfall Data. Katholieke Universiteit Leuven, Department of Earth and Environmental Sciences. Belgium: The Abdus Salam International Centre for Theoretical Physics.
Selase, A. E., Agyimpomaa, E. E. D., Hakii, N. M. D. & Selasi D. D., (2015). Precipitation and rainfall types with their characteristics feature. Journal of Natural Sciences Research, 5(20), 89-92.
Sing, L. K., Mahmood, M. F., & Salleh, S. B. (1983). Hydrological Procedure No. 26. Estimation of Design Rainstorm in Sabah and Sarawak. Drainage and Irrigation Department. Ministry of Agriculture, Kuala Lumpur.
Downloads
Published
How to Cite
Issue
Section
License
During the manuscript submission process, the corresponding author, on behalf of all authors, will be asked to agree to the terms of the Open Access Publishing Agreement by checking the designated agreement box (see Copyright & Licensing for more information).
Open Access Publishing Agreement
1) By agreeing to these terms, the author(s) retain full copyright and grant UNIMAS Publisher the right of first publication. The author(s) also grant UNIMAS Publisher permission to reproduce, recreate, translate, extract, or summarize, and to distribute and display in any forms, formats, and media. The author(s) can reuse their papers in their future printed work without first requiring permission from UNIMAS Publisher, provided that the author(s) acknowledge and refer to the publication in the Journal.
2) The author(s) agree that their articles published under UNIMAS Publisher are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0), which permits unrestricted use, distribution, and reproduction in any medium, for non-commercial purposes, provided the original work of the author(s) is properly cited.
3) The author(s) are responsible for ensuring their submitted work is original and does not infringe any existing copyright, trademark, patent, statutory right, or proprietary right of others. The corresponding author has obtained permission from all co-authors prior to submission to the journal. Upon submission of the manuscript, the author(s) agree that no similar work has been or will be submitted or published elsewhere in any language. If the submitted manuscript includes materials from others, the authors have obtained permission from the copyright owners.
4) By agreeing to this statement, the author(s) declare that the research which they have conducted complies with the current laws of the respective country and UNIMAS Journal Publication Ethics Policy. Any experimentation or research involving humans or the use of animal samples must obtain approval from the Human or Animal Ethics Committee in their respective institutions. The author(s) agree and understand that UNIMAS Publisher is not responsible for any compensational claims or failure caused by the author(s) in fulfilling the above-mentioned requirements. The author(s) must accept the responsibility for releasing their materials upon request by the Chief Editor or UNIMAS Publisher.
5) The author(s) should have participated sufficiently in the work and ensured the appropriateness of the content of the article. The author(s) should also agree that they have no commercial attachments (e.g., patent or license arrangement, equity interest, consultancies, etc.) that might pose any conflict of interest with the submitted manuscript. The author(s) also agree to make any relevant materials and data available upon request by the editor(s) or UNIMAS Publisher.
