An analysis of annual maximum streamflows in Terengganu, Malaysia using TL-moments approach

TL-moments approach has been used in an analysis to determine the best-fitting distributions to represent the annual series of maximum streamflow data over 12 stations in Terengganu, Malaysia. The TL-moments with different trimming values are used to estimate the parameter of the selected distributi...

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Bibliographic Details
Published in:Theoretical and applied climatology 2013-02, Vol.111 (3-4), p.649-663
Main Authors: Ahmad, Ummi Nadiah, Shabri, Ani, Zakaria, Zahrahtul Amani
Format: Article
Language:English
Subjects:
Analysis
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Climate science
Climatology
Creeks & streams
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Exact sciences and technology
Floods
Hydrologic data
Hydrology
Hydrology. Hydrogeology
Monte Carlo method
Monte Carlo simulation
Original Paper
Probability distribution
Stream discharge
Stream flow
Streamflow
Waste Water Technology
Water Management
Water Pollution Control
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Summary:TL-moments approach has been used in an analysis to determine the best-fitting distributions to represent the annual series of maximum streamflow data over 12 stations in Terengganu, Malaysia. The TL-moments with different trimming values are used to estimate the parameter of the selected distributions namely: generalized pareto (GPA), generalized logistic, and generalized extreme value distribution. The influence of TL-moments on estimated probability distribution functions are examined by evaluating the relative root mean square error and relative bias of quantile estimates through Monte Carlo simulations. The boxplot is used to show the location of the median and the dispersion of the data, which helps in reaching the decisive conclusions. For most of the cases, the results show that TL-moments with one smallest value was trimmed from the conceptual sample (TL-moments (1,0)), of GPA distribution was the most appropriate in majority of the stations for describing the annual maximum streamflow series in Terengganu, Malaysia.
ISSN:0177-798X
1434-4483
DOI:10.1007/s00704-012-0679-x