Determining probability distribution for streamflow regions using partial-moments

• Main Authors: Zakaria, Zahrahtul Amani, Shabri, Ani, Awang, Mohd. Khalid
• Format: Article
• Published: International Journal of Advances in Science, Engineering and Technology 2017
• Subjects: Q Science (General)
• Online Access: http://eprints.utm.my/id/eprint/81522/; http://www.worldresearchlibrary.org/up_proc/pdf/527-14797292679-12.pdf

An attempt has been made to model the annual maximum streamflow, utilizing the guidelines in the regional flood frequency analysis. The Partial L-moments (PL-moments) at several censoring levels are employed to estimate the regional parameters of three extreme value distributions, namely; generalized extreme value (GEV), generalized logistic (GLO) and generalized Pareto (GPA) distributions. A total number of 18 streamflow stations located throughout the eastern region of Peninsular Malaysia were used as a case study. Firstly, the data is screening out for data verification and quality control. Next, identification of homogeneous regions is made using homogeneity test based on PL-moments. The PL - diagram is then constructed and GEV and GLO distributions appeared to be the acceptable distributions for representing the regional data. However, it is relatively difficult to identify a particular distribution that most fitted the regional data.Thus, goodness-of-fit test (Z-test) is used and the result showed that the most appropriate distribution for modeling maximum streamflow in the East Coast of Peninsular Malaysia, based on PL-moments is the GLO distribution.