Is there any amphidromic point of S2 constituent around the Natuna Islands in the southern South China Sea?
ABSTRACT The discrepancies that if there is any amphidromic point of S2 constituent and its location if there is around the Natuna Islands in the southern South China Sea have suspended for a long
time, however, there is always no convincing research to settle them up to now. The TOPEX/Poseidon and Jason-1 altimeters
have been providing a long-term sea surface height data, which can be used to calculate the constants of tidal constituents
along the satellite footprint with the harmonic analysis method. Based on more than 12 years altimetry data from T/P and Jason-1,
the character of phase lags from harmonic analysis is used to identify if there is a S2 amphidromic point around the Natuna Islands. The result shows that there is no S2 amphidromic point instead of a nodal line of a standing wave, and the amplitude of S2 constituent is close to zero along the nodal line.
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ABSTRACT: The Sunda Shelf is settled in Southeast Asia where it forms a large submerged extension of the continental shelf of mainland Asia. The Sunda shelf includes the Greater Sunda Islands of Borneo, Java and Sumatra and the bulk of the shelf forms the shallow seabed of the South China Sea, the coastal areas of Cambodia, Malaysia Peninsula, Singapore, Borneo, and parts of the coast of Indonesia, Thailand, and Vietnam. This shelf is characterized by complex shoreline and seafloor topography which can result in complicated tidal characteristics. In this work, we aim to gain insightful understanding of mechanism of the tidal wave propagation in this region. To achieve this, we perform simulation with high fidelity for the Gulf of Thailand and nearby areas. The high fidelity includes high resolution bathymetry (30 seconds), finer scale capturing and ability to preserve the realistic, complex coastline and islands. To this end, we employ the finite volume method in our simulation for its geometric flexibility, computational efficiency as well as volume and mass conservation assurance. In the current study, we focus mainly on the tidal dynamic processes in the Sunda shelf region, and we numerically scrutinize exact amphidromic systems as well as the corresponding energy flux of the principal tides (M2, K1, S2 and O1) in the Sunda shelf of the South China Sea. Comparisons to other numerical and experimental observations have been done.
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ABSTRACT: Based on the tidal simulation of ECOMSED, the Simpson-Hunter(S-H) stratification parameter is calculated to study the tidal fronts in the continental shelf of the South China Sea (SCS). The results show that, besides the tidal fronts around the Hainan Island which have been studied by Hu et al. (2003) [Hu, J.Y., Kawamura, H., Tang, D.L., 2003. Tidal front around the Hainan Island, northwest of the South China Sea. Journal of Geophysical Research 108(C11), 3342, doi:10.1029/2003JC001883], there are also five tidal fronts in the south of Taiwan Strait (STS), Pearl River estuary (PRE), Mekong River estuary (MRE), southwestern coast of Vietnam (SCV) and northern coast of east Malaysia (NCEM), and they are consistent with Chlorophyll-a (Chl-a) fronts detected by SeaWiFS. The positions of predicted tidal fronts in the STS and PRE are also consistent with those of sea surface temperature (SST) fronts. The criterion value of S-H, 2.6–2.7, should be used for prediction of tidal fronts in the MRE and 2.2–2.4 in the NCEM. Further studies show that tidal mixing can be considered as one of the main causes of the formation of Chl-a fronts in those five coastal sea areas, and the M2 tidal constituent plays an important role in tidal mixing in the STS, PRE, MRE and NCEM while both K1 and O1 play important roles in tidal mixing in the SCV.Journal of Marine Systems 08/2010; 82(3):145-153. DOI:10.1016/j.jmarsys.2010.04.011 · 2.48 Impact Factor