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Sains Malaysiana 46(5)(2017): 685–693 http://dx.doi.org/10.17576/jsm-2017-4605-02 Grain Size Analysis of Surface Fluvial Sediments in Rivers in Kelantan, Malaysia (Analisis
Saiz Butiran Sedimen Permukaan Sungai di Kelantan, Malaysia) WAN HANNA
MELINI
WAN
MOHTAR*,
SITI
AMINAH
BASSA
& MOJTABA PORHEMMAT Jabatan Kejuruteraan Awam & Struktur, Fakulti Kejuruteraan
& Alam Bina, Universiti Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor Darul Ehsan, Malaysia Diserahkan: 5 Februari 2015/Diterima: 17 Oktober 2016 ABSTRACT Grain size spectrum and textural parameters for the fluvial sediment
bed in seven tropical rivers of Kelantan, Malaysia are presented
in this article. The samples were collected from six tributaries
to the main Sungai Kelantan spanning approximately 248 km stretch
of water streams. Sand or gravel dominated river was identified
for each river using the sediment composition analysis. Textural
pattern shows complicated profiles of mean size and no consistent
decreasing grain size and gradation parameter were observed towards
the downstream flow. Most of the samples fall under the category
of either very poorly sorted or poorly sorted and has very platykurtic
kurtosis distributions. CM diagram (C=one percentile in microns
and M = median grain size in microns) suggested that the deposition
of fine-grained sediment for samples with median grain size d50 <1 mm are either by rolling,
rolling and saltation or saltation and suspension. Keywords: CM diagram; fluvial sediment; grain size; sediment composition
analysis; tropical rivers ABSTRAK Saiz butiran spektrum dan parameter tekstur untuk sedimen di dasar
tujuh sungai tropika Kelantan, Malaysia dibincangkan dalam kertas
ini. Sampel telah diambil daripada enam anak sungai utama kepada
Sungai Kelantan yang merangkumi kira-kira 248 km sepanjang sungai.
Pasir atau batu kelikir di sungai yang mendominasi telah dikenal
pasti untuk setiap sungai menggunakan analisis komposisi sedimen.
Corak tekstur menunjukkan profil rumit bagi saiz min dan tiada penurunan
saiz butiran dan penggredan parameter secara tekal diperhatikan
mengikut arah menuju hiliran. Kebanyakan sampel berada dalam kategori
sama iaitu amat tidak terisih atau kurang terisih dan mempunyai
taburan kurtosis sangat platikurtik. Gambarajah CM (C = satu peratus
dalam mikron dan M = saiz butiran median dalam mikron) menunjukkan
bahawa pemendapan sedimen halus untuk sampel dengan median saiz
butiran d50 <1
mm adalah sama ada dengan olengan, olengan dan loncatan atau loncatan
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*Pengarang
untuk surat-menyurat; email: hanna@ukm.edu.my
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