Investigation of the Seasonal Variation of Passive Tracer Released from River mouths in the Inner Gulf of Thailand by using a Hydrodynamic Model
Abstract
Seasonal variation of passive tracer distribution in the inner Gulf of Thailand was investigated by using a hydrodynamic model namely the Princeton Ocean Model (POM) coupled with the dispersion model of a conservative substance. It was found that clockwise and counterclockwise circulation developed during the southwest and the northeast monsoons, respectively. Passive tracers distributed from the river mouths were controlled by seasonal circulation. Currents during the southwest monsoon carry the tracers from the river mouths along the north coast to the east coast of the inner Gulf of Thailand. The tracers representing runoff from the Bang Pakong River and the Chao Phraya River dominate the east coast of the gulf throughout the year. The percentage of the tracers of the Bang Pakong River, the Chao Phraya River, the Mae Klong River and the Tha Chin River influencing the eastern area ranged between 12.1-81.7, 18.3-47.9, 0.0-46.1 and 0.0-10.8, respectively. Currents during the northeast monsoon transported the tracers from the river mouths along the north coast to the west coast of the gulf. The tracers from the Mae Klong River mouth and the Chao Phraya River mouth mostly influenced the west coast. The percentage of the tracers spreading from the Mae Klong River, the Chao Phraya River, the Tha Chin River and the Bang Pakong River ranged between 18.5-98.2, 0.0-68.2, 1.7-21.9 and 0.0-6.1, respectively. The simulation results of the seasonal tracer movement were consistent with previous reports of red tide incidences. Keywords : Passive tracer, Inner gulf of Thailand, Hydrodynamic modelReferences
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Buranapratheprat, A., Yanagi, T., & Sawangwong, P. (2002). Seasonal variations in circulation and salinity distributions in the upper Gulf of Thailand: Modeling approach (Vol. 40).
Buranapratheprat, A., Yanagi, T., Niemann, K.O., Matsumura, S., & Sojisuporn, P. (2008). Surface chlorophyll dynamics in the upper Gulf of Thailand were revealed by a coupled hydrodynamic-ecosystem model. Journal of Oceanography 64, 639 - 656.
Buranapratheprat, A., Morimoto, A., Phromkot, P., Mino Y., Gunbua V. & Jintasaeranee P. (2021). Eutrophication and Hypoxia in the upper Gulf of Thailand. Journal of Oceanography.
Gordeev, V. V., & Lisitzin, A. P. (2014). Geochemical interaction between the freshwater and marine hydrospheres. Russian Geology and Geophysics, 55(5), 562-581.
Institute of Marine Science. (2006). Surveillance project and planning guidelines for the prevention of red tide in coastal areas Chonburi. Research funding: The Chonburi Provincial Administrative Organization.
Prempree T., T. Wannarungsri, N. Kornkanitnan & P. Cherdsukjai. (2018). Type and quantity of floating marine debris from river mouths in the Upper Gulf of Thailand. Marine and Coastal Resources Research Center, Upper Gulf of Thailand. Department of Marine and Coastal Resources.
Simpson, J. H. (1997). Physical processes in the ROFI regime. Journal of Marine Systems, 12(1), 3-15.
Wang, Y., Jiang, H., Jin, J., Zhang, X., Lu, X., & Wang, Y. (2015). Spatial-Temporal Variations of Chlorophyll-a in the Adjacent Sea Area of the Yangtze River Estuary Influenced by Yangtze River Discharge. Int. J. Environ. Res. Public Health, 12(5), 5420-5438.
Wattayakorn, K. & Jaiboon, P. (2014). An assessment of the Biogeochemical cycle of nutrients in the inner gulf of Thailand. European Chemical Bulletin, 3(1), 50-54.
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2022-06-07
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