การศึกษากระแสน้ำ ไดเวอร์เจนซ์และคอนเวอร์เจนซ์บริเวณชายฝั่งจังหวัดตราด โดยใช้แบบจำลองอุทกพลศาสตร์

Anukul   Buranapratheprat; Sujitra Boonjun; Mitila   Pransin; Isara   Arsiranant

Authors

Anukul Buranapratheprat Department of Aquatic Science, Faculty of Science, Burapha University
Sujitra Boonjun Department of Aquatic Science, Faculty of Science, Burapha University
Mitila Pransin Marine and Coastal Resources Research Center, the Eastern Gulf of Thailand, Department of Marine and Coastal Resources
Isara Arsiranant Marine and Coastal Resources Research Center, the Eastern Upper Gulf of Thailand, Department of Marine and Coastal Resources Mathematics, Faculty of Education, Roi Et Rajabhat University

Keywords:

current divergence, current convergence, Trat province , hydrodynamic model

Abstract

The purpose of this research is to study circulation patterns, and current divergence and convergence in the coastal area of Trat Province in 2018 using the Princeton Ocean Model (POM). The results showed that the circulation patterns were mainly controlled by the monsoon winds. The depth-averaged current magnitude was high in the southwest monsoon with a direction from the northwest to the southeast, and it was low in the northeast monsoon with a direction from the southeast to the northwest. The coastal area has small divergence alternating small convergence throughout the year. Large divergence and convergence were found near the north coast of the study area, and the west coast of Chang Island, Mak Island, and Kood Island. They were also found in Trat Bay but in smaller sizes. During the southwest monsoon, the current magnitude was high, and divergence/convergence appeared clearer than in the other monsoon seasons. The monsoon winds were the main factor controlling the circulation patterns, resulting in the seasonal variations of current divergence/convergence. The geographical and coastal features of Trat Province were other factors affecting circulations and current divergence/convergence. The convergence areas were found to relate to red tide and jellyfish bloom development. However, those phenomena are also controlled by other biological and physical factors.

References

Blumberg, A. F. & Mellor, G. L. (1987). A description of a three-dimensional coastal ocean circulation model. p. 1-16. In N. S. Heaps (Ed.), Three-Dimensional Coastal Ocean Model. (pp. 1-16). Washington DC: AGU.

Buranapratheprat, A., Kan-atireklarp, S., Yuenyong, S. & Kan-atireklarp, S. (2018). Fluxes of Suspended Sediment and Dissolved Inorganic Nutrients at the Welu River Mouth in Dry and Wet Seasons in 2014. Burapha Science Journal, 23(1), 546-556. (in Thai)

Buranapratheprat, A., Yanagi, T., Sawangwong, P. (2002). Seasonal variations in circulation and salinity distributions in the upper Gulf of Thailand: modeling approach. La mer, 40, 147-155.

Colling, A. (2001). Ocean circulation (Vol. 3). Butterworth-Heinemann.

Department of Marine and Coastal Resources - DMCR. (2015). Plankton bloom is the reason why the sea water changes color in Trat Province. Bangkok. (in Thai)

Department of Marine and Coastal Resources - DMCR. (2017). Jellyfish bloom near the coast of Pak Klong Son, Trat Province. Bangkok. (in Thai)

Department of Marine and Coastal Resources - DMCR. (2018). Marine and Coastal Resources data in Trat province. Bangkok: Information and Surveying Technology for Marine and Coastal Resources Division. (in Thai)

Department of Marine and Coastal Resources - DMCR. (2020). Distribution of The Dangers jellyfish in the coastal areas of Trat Province. Bangkok: The Situation of Marine and Coastal Resources and Coastal Erosion Report. (in Thai)

Department of Marine and Coastal Resources - DMCR. (2021). The Dangers of Box Jellyfish, Koh Kood. Bangkok. (in Thai)

Eastern Region Irrigation Hydrology Center - RID. (2017). River Discharge in Chanthaburi Province. Chonburi. (in Thai)

Leenawarat, D., Tong-U-dom, S & Buranapratheprat, A. (2018). A Hydrodynamic Model for the Study of the Seasonal Variation in the Residence Time of Water Mass in the Inner Gulf of Thailand. Burapha Science Journal, 24(1), 1-16. (in Thai)

Marine Department – MD. (2018). Water Elevation in Trat Province. Bangkok. (in Thai)

Moller, H. (1980). Population dynamic of Aurelia aurita medusae in Kiel Bight , Germany (FRG). Marine Biology, 60, 123-128.

Nastav B., Malej M., Malej and A.Jr. Malej A. (2013). Is it possible to determine the economic impact of jellyfish outbreaks on fisheries. Medit. Mar. Sci., 14(1), 214-223.

Meesub, B., Buranapratheprat, A., Thaipichitburapa, P., Kan-atireklarp, S. & Kan-atireklarp, S. (2021). Fluxes of Dissolved Inorganic Nutrients and Suspended Sediment at The Trat River Mouth, Trat Province in 2018. Burapha Science Journal, 26(1), 526-544. (in Thai)

Michida Y., Takimoto R., Sojisuporn P. and Yanagi T. (2006). Divergence/convergence field observed with GPS tracked drifters in the Upper Gulf of Thailand. Coastal Marine Science, 30(1), 27-35.

Paibulkichakul, B., Kraiharn, S., Paibulkichakul, C. & Buranapratheprat, A. (2016). Flux of Silicate at Kham Hnu River Mouth, Tha Mai District, Chanthaburi Province. Khon Kaen Agriculture Journal, 44(special 1) 709 – 716. (in Thai)

Pond S. and Pickard G. L. (1983). Appendix 1 - Mathematical Review with Some Elementary Fluid Mechanics. In S. Pond & G. L. Pickard (Eds.), Introductory Dynamical Oceanography (Second Edition) (pp. 287-301). Oxford: Butterworth-Heinemann.

Sojisuporn P., Morimoto A. and Yanagi T. (2010). Seasonal variation of sea surface current in the Gulf of Thailand. Coastal Marine Science, 34(1): 91-102.

Tansuwan, V. (2003). Environmental Geology of Changwat Trat. Bangkok: Department of Mineral Resources. (in Thai)

Tourism Authority of Thailand East Region – TAT. (2013). Trat province. Bangkok. (in Thai)