The Malaysian Journal of Analytical Sciences Vol 14 No 1 (2010): 12 - 23
SURFACE EROSION AND SEDIMENT YIELDS ASSESSMENT FROM
SMALL UNGAUGED CATCHMENT OF SUNGAI ANAK BANGI SELANGOR
(Penilaian Hakisan Permukaan dan Muatan Sedimen Dari Kawasan Tadahan
Sungai Anak Bangi Selangor)
Mohd Ekhwan Toriman1*, Md. Pauzi Abdullah2,
Mazlin Bin Mokhtar3,
Muhamad Barzani Gasim4, Othman
Karim5
1 Fakulti of Social Sciences and Humanities
2,4 Faculty of
Science and Technology
3Institute of
Environment and Development (LESTARI)
5 Faculty of
Engineering and Built Environment
Universiti Kebangsaan Malaysia, 43600 UKM
BANGI, Selangor, Malaysia
*Corresponding
author: ikhwan@ukm.my
Abstract
This study was performed to
estimate surface erosion and suspended yield in the forested catchment of
Sungai Anak Bangi using USLE and numerical analyses from September-November
2006. . The value of erosion rate, as dominated by Serdang and Prang series
is moderate at 84.88 tons/ha/yr. Meanwhile, three major data were measured
namely the rainfall depth, the suspended sediment concentration and river
discharge (Q) at two sampling stations along the river. 12 rainfall events were
recorded with highest rainfall of 36.7 mm was received on October 02, 2006
while the lowest rainfall depth was recorded on October, 08, 2006 (1.9 mm).
Almost all the rainfall events occurred within the short and moderate durations
(< 7 hours). Meanwhile, the daily Q sampled range from 172.8 m3/day
to 6220.8 m3/day or 172, 800 and 6220, 800 L/day. The average
suspended sediment concentration values recorded for both stations are
considered low with 19.47 mg/l and 25.23 mg/l were recorded at Station 1 and
Station 2, respectively. When converted to average suspended sediment yield per
day, Sungai Anak Bangi was recorded of 75.0415 kg/day at Station 1 while at
Station 2 was 103.256 kg/day. When converted into per square km, the gross
value of suspended sediment yield leaved from Sungai Anak Bangi is estimated
about 27.907 kg/ km2/day or 10, 186 kg/ km2/yr-1.
Keywords: Suspended sediment concentration, rainfall, river discharge,
concentration, Sungai Anak Bangi
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