Pola
Sebaran Salinitas dengan Model Numerik Dua Dimensi
di
Muara Sungai Musi
Christie Indah Sari, Heron Surbakti
dan Fauziyah
Program Studi Ilmu Kelautan
FMIPA Universitas Sriwijaya, Inderalaya, Indonesia
Received 2 Juli 2012; received in
revised form 5 Agustus 2012;
accepted 10 September
2012
ABSTRACT
The
aim of this research is to describe the spread salinity with two dimensions
numerical model at the Musi River’s estuary, and also to determined
relationship of spread salinity with hydrodynamic unsure in water. The research
has been done at Juli – Agustus 2011 at Musi River’s estuary, South Sumatra.
Determination of sampling points is done by using purposive sampling method.
The sample is measured by in-situ method and the data is proceed using Surface
Water Modelling System (SMS 8.1) software, then verified with field
measurement. The result of this research indicated that when the condition of
sea-water tidal waters not too far into the river, the concentration of
salinity in the surface layer (0.2 D) ranged between 6 - 28o/oo,
in the water column (0.5 D) between 6 - 27o/oo, and in
the deep waters (0.8 D) between 5 - 27o/oo. In other
hand, at low tide condition, the influence of river moved farther out to the
sea, with the concentration of salinity in the surface layer (0.2 D) ranged
between 5 - 26o/oo, the salinity in the water column (0.5
D) and in the deep waters (0.8 D) between 4 - 27 o/oo.
The result of spread salinity of the model simulation shows that the salinity
distribution patterns follow the formed of the flow so that it can be said that
the flow will affect the distribution of salinity in the waters. Based on the
results of the flow simulation and salinity with or without the effects of
wind’s flow and salinity patterns are the same, in the range 0.9 to 23.9o/oo.
The verified average error result of measurement and simulation the model (MRE)
with or without wind is 3,163 E-11%. So,
factor of the wind did not significantly affect the movement of flow on the
research.
Keywords: Salinity distribution, Numerical
models, SMS, Estuary
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