Sains Malaysiana 44(10)(2015): 1521–1530

Some Statistical Characteristic of Malaysian Wind Direction Recorded at Maximum Wind Speed: 1999-2008

(Sebahagian Ciri Statistik Arah Angin Malaysia yang Direkodkan pada Kelajuan Angin Maksimum: 1999-2008)

S.Z. SATARI^1,2*, Y.Z. ZUBAIRI³, A.G. HUSSIN⁴ & S.F. HASSAN³

¹Institute of Graduate Studies, University of Malaya, 50603 Kuala Lumpur, Wilayah Persekutuan Malaysia

²Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Lebuhraya Tun Razak 26300 Gambang, Kuantan, Pahang Darul Makmur, Malaysia

³Centre for Foundation Studies in Sciences, University of Malaya,50603 Kuala Lumpur,

Wilayah Persekutuan Malaysia

⁴Faculty of Defence Sciences and Technology, National Defence University of Malaysia, Kem Sungai Besi, 57000 Kuala Lumpur, Wilayah Persekutuan, Malaysia

Received: 25 July 2013/Accepted: 30 June 2015

ABSTRACT

The statistical characteristics of wind direction that was recorded at maximum wind speed in Peninsular Malaysia for two monsoons from 1999 to 2008 for seven stations were analyzed in this study. Modeled by von Mises distribution, the change in parameters values namely mean direction and concentration parameter was measured. Statistical summary, graphical representations, Watson-William Test and linear-circular correlation are used in the analysis. It is found that there is a significant change in the mean direction of wind over the period of ten years for most stations in Peninsular Malaysia. However, there is a weak relationship between wind direction and wind speed. This study suggested the presence of prominent direction of wind that blows in Peninsular Malaysia by monsoon. This finding may provide useful information on giving a better understanding of the behavior of the wind in Peninsular Malaysia and the potential use of wind as an alternative source of energy.

Keywords: Circular statistics; climate; von Mises distribution; wind direction; wind speed

ABSTRAK

Ciri statistik arah angin yang dicatatkan pada kelajuan angin maksimum bagi tujuh stesen di Semenanjung Malaysia untuk dua monsun dari tahun 1999 hingga 2008 telah dianalisis dalam kajian ini. Arah angin ini dimodelkan oleh taburan von Mises dan perubahan dalam nilai-nilai parameternya iaitu min berarah serta parameter menumpu telah diukur. Ringkasan statistik, perwakilan grafik, ujian Watson-William dan korelasi linear membulat turut digunakan dalam analisis ini. Didapati bahawa terdapat perubahan ketara dalam min hala tuju angin sepanjang tempoh sepuluh tahun bagi kebanyakan stesen di Semenanjung Malaysia. Walau bagaimanapun, terdapat hubungan yang lemah antara arah angin dan kelajuan angin. Kajian ini mencadangkan terdapat kehadiran arah utama angin yang bertiup di Semenanjung Malaysia untuk setiap monsun. Penemuan ini boleh memberikan maklumat yang berguna serta pemahaman yang lebih baik terhadap tingkah laku angin di Semenanjung Malaysia dan potensi penggunaan angin sebagai sumber tenaga alternatif.

Kata kunci: Arah angin; iklim; kelajuan angin; statistik berarah; taburan von Mises

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*Corresponding author; email: zanariah@ump.edu.my