Title :

Assessments of surface current variability along the mid-southern coast of Vietnam from high-frequency (HF) radar measurements

Author(s) :

Tran, Thanh Huyen [Auteur]
Sentchev, Alexei [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Tran, Manh Cuong [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Duc Dang, Dinh [Auteur]
Helzel, Thomas [Auteur]

Journal title :

IEEE OCEANS

Pages :

1-5

Publisher :

Institute of Electrical and Electronics Engineers Inc.

Publication date :

2022

ISSN :

0197-7385

English keyword(s) :

sea surface currents
HF radar
mesoscale divergence
pollution monitoring
disaster prevention

English abstract : [en]

Characteristics of the coastal surface currents inVietnam are often challenging to be well-described due to thelack of reliable data. Thus, a remote sensing technology – high frequency(HF) WavE RAdar (WERA) has been ...
Show more >Characteristics of the coastal surface currents inVietnam are often challenging to be well-described due to thelack of reliable data. Thus, a remote sensing technology – high frequency(HF) WavE RAdar (WERA) has been implemented tomonitor the surface currents along the mid-southern coast ofVietnam, which is largely influenced by the strong South ChinaSea Western Boundary current system (SCSWBC). The HFradar data obtained from a measurement campaign in May, 2019were checked for outliers through variance-filters. Thereafter,the velocity fields were reconstructed using 2DVar-EOF gapfilling and interpolation method [1, 2] for further analysis. Thereconstructed surface current maps showed that the maincurrent direction in this area during summer was northeast andthe flow was driven by the southwest monsoon which usuallystarts from May [3]. The eastern sector of the domain wasnoticed with remarkably strong northeast current. At the onsetof summer monsoon, the jet was weaken and deviated, thus,strongly modified the dynamics of the region [4]. A currentdivergence was observed in the northeastern and eastern parts ofthe study area. Some other interesting features of surfacecirculation were revealed during the second week ofmeasurements, on 9-10 of May. Those features are characteristicsof the east Vietnam cyclonic eddy and the southeastward offshore current [3–5]. On May 9, the cyclonic eddy expandedfurther to the south and prevailed over the entire area within aweek. Spectral analysis was performed to identify the dominantfrequencies of the surface current variability. The resultsdemonstrated the capability of HF radars in monitoring suchsub- and meso-scale motions of near-shore surface currents.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL