Remote Mapping of Sea Surface Currents Using HF Doppler Radar Networks

Joseph, Antony

doi:10.1016/b978-0-12-415990-7.00004-1

Cited by 4 publications

(2 citation statements)

References 131 publications

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“…Shore-based HF radar systems can measure and map surface currents to distance approximately 200 kilometers from the shoreline depending on the frequency employed. The small discrepancy in frequency (Doppler shift) between the transmitted signal from an onshore instrument and the backscattered signal from the sea surface is analyzed to obtain the motion of sea surface waters [1,2,3,4,5]. One of the advantages of HF radar over other current measurement technologies is the ability to simultaneously measure variability in both time and space [6].…”

Section: Introductionmentioning

confidence: 99%

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

Saramul¹

2017

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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).

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Section: Introductionmentioning

confidence: 99%

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

Saramul¹

2017

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“…In some of the cases such as radars, electromagnetic (EM) waves are used to gather information about distant objects mainly measurement of near shore ocean and river surface current velocities. In such applications line of sight velocity component of ocean waves will be received by forward and aft squinted antennas and then combined together to estimate the actual velocity vector [1]. The velocity is measured by Doppler shift as the frequency shift of the reflected signal from the moving object is proportional to velocity.…”

Section: Introductionmentioning

confidence: 99%