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https://ptsldigital.ukm.my/jspui/handle/123456789/519445| Title: | Modeling of circulation, tides and thermohaline structures of the southern region of the south china sea using regional ocean model system (ROMS) |
| Authors: | Farshid Daryabor (P42592) |
| Supervisor: | Fredolin Tanggang @ Tajudin Mahmud, Prof Dr. |
| Keywords: | Modeling of circulation Modeling of tides odeling of thermohaline structures Regional ocean model system ROMS Ocean circulation |
| Issue Date: | 30-Jan-2012 |
| Description: | The Regional Ocean Modelling System (ROMS) was used to investigate the dynamics of circulation and thermohaline structures of the southern region of the South China Sea covering Peninsular Malaysia's eastern continental shelf sea and coastal waters of western Borneo. The first part of the study considered the wind-driven circulation and associated thermohaline structure. The simulated surface circulation was generally cyclonic during the winter season and anticyclonic during the summer monsoon period with strong western boundary currents at the Peninsular Malaysia's eastern continental shelf. The maximum speed was about 1ms-1 (0.5ms-1) and extended the depth to around 30m (40m) during winter (summer) season. During summer, the western boundary currents split and partially leave the coast. The bifurcation point is roughly 4o N in June and shifts north to ~8o N in July. The simulated isotherm structures for summer and winter were nearly horizontal from east to west except at the coastal regions. Based on different sensitive experiments such as the removal of surface wind, freshwater and the shortwave radiation fluxes, it was found that the instability of the coastal currents generates the coastal eddies. Strong alongshore wind was responsible for stronger currents and upwelling along the eastern coast of Peninsular Malaysia during summer. It was also found that the surface freshwater and shortwave radiation fluxes play a secondary role in variations of the mean seasonal cycle in this region. The second part of the study dealt with the modeling of tidal currents and amplitudes. Eight major constituents (M2, S2, K1, O1, N2, K2, P1 and Q1) were considered. Surface height and tidal currents of the TPXO.6 solution (global tidal model) were added to the 2D momentum through boundary conditions. The simulation period covered the period of 15th January to 15th March 2000 and the model was integrated for these two months. Observations from 19 tide gauge stations were used to validate the model. The results indicated that the 3D modelled tides compared well with observation in terms of its phase with discrepancies of less than 7.2% for the most energetic M2 constituent and 5.5% of K1, respectively. From the spectrum analysis it can be concluded that the east coast of Peninsular Malaysia was dominated by K1 and M2 with K1 being stronger than M2. The southern region was mostly influenced by K1 as shown in the K1 tidal ellipse patterns. The K1 tidal ellipses also indicated that the tidal current originated from the Java Sea.,PhD |
| Pages: | 147 |
| Call Number: | GC228.5 .D347 2012 |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi |
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