Improving hydrodynamic modeling of an estuary in a mixed tidal regime by grid refining and aligning |
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| Authors: | G M Jahid Hasan Dirk Sebastiaan van Maren Hin Fatt Cheong |
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| Institution: | (1) Singapore-Delft Water Alliance, National University of Singapore, No. 2 Eng. Drive 2, Singapore, 117577, Singapore;(2) Department of Civil and Environmental Engineering, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh;(3) Department of Coastal and Marine Systems, Deltares, Rotterdamseweg 185, Delft, the Netherlands;(4) Department of Hydraulic Engineering, Delft University of Technology, Delft, the Netherlands;(5) Department of Civil and Environmental Engineering, National University of Singapore, 1 Eng. Drive 2, Singapore, 117576, Singapore |
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| Abstract: | Water levels and flows in the Singapore coastal waters are driven by the complex interactions of the Indian and Pacific Ocean
tides, seasonal monsoon-driven contributions and also forced by local winds. The Singapore Regional Model was developed to
simulate hydrodynamics in the Strait of Singapore which produces representative sea level variation in this region. However,
resolution and alignment of the grid system of the model with respect to depth contours in some of its subregions, i.e., the
Johor Estuary area require further improvement. For this, the grid system of the model was modified and compared the simulated
results with field measurements. The computed flow velocities agreed better with field observations when the grid resolution
was increased. However, improving the alignment of the grid with the channel boundary (with a much lower increase in grid
resolution) provided a substantially larger improvement of the model performance. The grid modification greatly influenced
the computed salinity in the estuary, while water levels are slightly affected. Further analysis of model results showed a
pronounced ebb tidal asymmetry generated by the O1–K1–M2 tidal constituents in the estuary. |
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