Sains Malaysiana 48(7)(2019): 1357–1366

http://dx.doi.org/10.17576/jsm-2019-4807-05

L-Moment-Based Frequency Analysis of High-Flow at Sungai Langat, Kajang, Selangor, Malaysia

(Analisis Kekerapan berdasarkan L-momen Aliran Tinggi di Sungai Langat, Kajang, Selangor, Malaysia)

FIRDAUS MOHAMAD HAMZAH¹*, SITI HAWA MOHD YUSOFF^1,2 & OTHMAN JAAFAR¹

¹Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Department of Science and Biotechnology, Faculty of Engineering and Life Sciences, Universiti Selangor, 45600 Bestari Jaya, Selangor Darul Ehsan, Malaysia

Received: 12 November 2018/Accepted: 5 April 2019

ABSTRACT

Annual maximum daily streamflow data were used to examine flood frequency for Sungai Langat in Kajang, Selangor, Malaysia. The objectives of this study were to identify the best fit probability distribution to the streamflow data and estimate the return period of the extreme flood events. The L-moment method was implemented to estimate the parameter of probability, by using distributions namely Gamma, LN3, GEV, PE3, GLO and Kappa. It was found that Kappa distribution was the best fitting distribution to the data after being tested using the goodness-of-fit tests. The Kappa distribution gave the most appropriate to the annual maximum series data of Sungai Langat, Kajang, Selangor. The return values were calculated using Kappa distribution model. The return period of 2 years gave the return value of 49.09 m3/s, while return period of 100 years gave the return value of 390.54 m3/s.

Keywords: Goodness-of-fit test; L-moment; probability distribution; return period; streamflow

ABSTRAK

Kajian terhadap frekuensi banjir dilakukan bagi kawasan Sungai Langat, Kajang, Selangor, Malaysia dengan menggunakan data maksimum tahunan yang diperoleh daripada data aliran sungai harian. Objektif kajian ini adalah untuk mengenal pasti taburan kebarangkalian terbaik bagi aliran sungai dan seterusnya menganggarkan tempoh pulangan banjir. Kajian ini mengaplikasikan kaedah L-momen untuk menganggarkan parameter kebarangkalian iaitu Gamma, LN3, GEV, PE3, GLO dan Kappa. Didapati taburan Kappa merupakan taburan terbaik setelah diuji menggunakan ujian kebagusan penyuaian. Oleh itu, taburan Kappa dipilih sebagai taburan yang paling sesuai bagi data siri maksimum tahunan untuk Sungai Langat, Kajang, Selangor. Seterusnya, nilai tempoh pulangan dapat dihitung dengan menggunakan parameter Kappa. Tempoh pulangan 2 tahun memberi nilai 49.09 m3/s, manakala tempoh pulangan 100 tahun memberi nilai 390.54 m3/s.

Kata kunci: Aliran sungai; L-momen; taburan kebarangkalian; tempoh pulangan; ujian kebagusan penyuaian

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*Corresponding author; email: fir@ukm.edu.my