Abstract
Study of suspended sediment transport in Dumai Estuary is
investigated. Observation of suspended sediment, bed sediment, salinity, tidal
elevation and surface current were conducted in the surrounding the mouth of
estuaries. The observation was conducted at Northwest monsoon in two tidal
cycle. The results show that the land effect more dominant in this research
area and the salinity at the surface is higher at low to high period than high
to low periods. The bottom sediments are composed by mud and fine sand with 70
% for mud, 25% for fine sand and 5% is gravel. The measurement of suspended
sediment also shows that sediment concentration higher at the high to low tide
than low to high tide. The vertical suspended sediments in the vertical
diraction is about 50-460 mg/l. The high concentration observed at the surface
layer and decrease to the bottom. Comparision between analytical model dan
observation in vertical structure of sediment transport showed a good
agreements. The concentration of sediment in a Dumai river lower compared with
Rupat strait, this revealed that the Dumai river is only a tiny fraction of a
source of suspended sediment in that area.
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