Seasonal Monsoon Variations in Surface Currents in the Gulf of Thailand Revealed by High Frequency Radar

  • Suriyan Saramul Chulalongkorn University


Download data is not yet available.


Surface currents in coastal waters can be mapped with high frequency radar (HF radar). In this study, month-long surface vector current data from the Upper Gulf, Central Gulf and Lower Gulf of Thailand (UGOT, CGOT, and LGOT, respectively) were analyzed and compared during a northeast (24 January - 22 February 2015) and southwest (25 May - 23 June 2015) monsoon to investigate seasonal patterns. Temporal averaging of surface currents at UGOT indicated no circulation pattern differences between seasons. Area averaging revealed that flow was strongly tidally influenced; however, a tidal influence was observed during the southwest monsoon at CGOT and LGOT. During the northeast and southwest monsoons at both CGOT and LGOT, residual current flowed in the northwest and northeast directions, respectively. Tidal ellipse analysis of diurnal (K1 and O1) and semi-diurnal (M2 and S2) tidal components demonstrated that the magnitude and rotation of each component differed from site to site and season to season. Overall, this study revealed that surface current patterns in the Gulf of Thailand changed from one season to another, provided evidence for changes in spring and neap tide signal (during monsoon events), and the possible existence of anti-cyclonic eddies (driven by monsoon events).

View article in other formats
Author Biography
Suriyan Saramul

Department of Marine Science, Faculty of Science, Chulalongkorn University, Bangkok 10330,

Vol 21 No 4, Jul 31, 2017
How to Cite
S. Saramul, “Seasonal Monsoon Variations in Surface Currents in the Gulf of Thailand Revealed by High Frequency Radar”, Engineering Journal (Eng. J.), vol. 21, no. 4, pp. 25-37, Jul. 2017.

Authors who publish with Engineering Journal agree to transfer all copyright rights in and to the above work to the Engineering Journal (EJ)'s Editorial Board so that EJ's Editorial Board shall have the right to publish the work for nonprofit use in any media or form. In return, authors retain: (1) all proprietary rights other than copyright; (2) re-use of all or part of the above paper in their other work; (3) right to reproduce or authorize others to reproduce the above paper for authors' personal use or for company use if the source and EJ's copyright notice is indicated, and if the reproduction is not made for the purpose of sale.

Article Statistics
Total PDF downloads: 182