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| Titel |
Tidal dynamics with corrected volume transport at Sunda Shelf and Singapore Strait |
| VerfasserIn |
Pavel Tkalich, Quang-Hung Luu, Haihua Xu |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103102
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| Publikation (Nr.) |
 EGU/EGU2015-4782.pdf |
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| Zusammenfassung |
| Connecting the Indian Ocean with the South China Sea and the Pacific Ocean, the Sunda
Shelf displays a complicated transitional hydrodynamic characteristics. At daily
timescale, water level and current in the shelf are governed by mixed diurnal and
semidiurnal tides. At monthly timescale, mean sea level and seasonal volume transport are
amplified by monsoonal winds from the South China Sea. In this study, we present the
development of a high-resolution barotropic numerical model for the Sunda Shelf based
on the Semi-implicit Eulerian–Lagrangian Finite-Element (SELFE) model. The
computational domain includes western half of the South China Sea, Malacca Strait, Java
Sea, and is focused on Singapore Strait. Topography complexity is resolved by
merging the high-resolution bathymetry data from Jeppesen’s C-MAP product and the
General Bathymetric Chart of the Oceans One Minute Grid (GEBCO1). A fine
unstructured mesh consisting of a half million (447974) elements is generated for
the entire domain, with very fine elements (up to 100 meter) along the coast of
the Singapore Strait. At open boundaries, the model is forced by FES2012 tide
prediction. The model is calibrated at open boundaries based on mean sea level
archived from AVISO satellite altimetry data to reproduce corrected monthly volume
transport through Malacca, Singapore and Karimata Straits. Surface wind stress is
taken into account using daily NCEP climatology downscaled by WRF model. The
computed sea level agrees well with tide gauge records and consistent with tidal
prediction softwares (TotalTide, MIKE21 and FES2012) at hourly and monthly scales.
Computed tidal currents are well compared against ADCP measurements in the
Singapore Strait. The mean discharge through the Karimata Strait is 1.3 Sv (1 Sv = 106
m3/s) toward the south, with the maximum of 2.8 Sv in December-January and
minimum of -0.8 Sv in July-August. The annual transport through the Malacca Strait is
mainly westward, with the mean of 0.13 Sv and the peak of 0.53 Sv in January. The
seasonal transport through the Singapore Strait reaches the highest of 0.15 Sv westerly
in January and the lowest of 0.04 Sv eastwardly in June, with the annual average
of 0.04 Sv. These estimates are consistent with results obtained in other studies. |
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