A comparison of near-surface current measurements by ADCP and HF-radar on the West Florida shelf

Kelly, F. J.; Bonner, James S.; Perez, J.C.; Trujillo, Dillon; Weisberg, Robert H.; Luther, Mark E.; He, Ruoying

doi:10.1109/ccm.2003.1194286

Cited by 9 publications

(12 citation statements)

References 12 publications

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“…Many comparative experiments of HF radar versus various in situ instruments have been performed with good results (e.g., [1], [2], [3], [4]). To further explore HF radar for use in a shallow-water enclosed bay we are studying the algorithms that produce surface current-velocity data.…”

Section: Introductionmentioning

confidence: 95%

Accuracy of surface current velocity measurements obtained from HF radar in Corpus Christi Bay, Texas

Trujillo

Kelly

Perez

et al.

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings

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Surface current mapping by means of High Frequency radar is an operational oceanographic tool. Researchers have identified the basic sources of error associated with this technology. Further research evaluating errors relating to the HF radar system and corresponding algorithms can facilitate coastal environment data assimilation. Uncertainty due to two sources of error is studied to obtain a more complete accuracy of the HF radar-measured total surface current velocity vectors. The error sources include geometry of the two station HF radar system and limits of the deep-water wave assumption of the algorithm that calculates current velocity from the HF radar signal. The latter is of particular interest to our work in a shallow environment such as Corpus Christi Bay. Water depths in portions of this and other Texas bays will push the limits of the deep-water assumption for the wavelengths of interest. A map of Corpus Christi Bay illustrating quantified GDOP for each point on the radar grid and an applicable matrix transformation that accounts for error due to the deep water wave assumption. The deep water assumption error is quantified and shown to be minimal for depths as shallow as one meter.

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Section: Introductionmentioning

confidence: 95%

Accuracy of surface current velocity measurements obtained from HF radar in Corpus Christi Bay, Texas

Trujillo

Kelly

Perez

et al.

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings

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“…The radial-ADCP comparison for this study is therefore expected to give mixed results with those from Formby, mainly orientated with the dominant east-west current, having better correlations than the Llanddulas radials, which are orientated with the smaller north-south current. For the same reasons a u and v component comparison in Liverpool Bay is expected to find a high u and low v correlation as was found by Kelly 15 when comparing the dominant along-shelf and lesser cross-shelf current components (Table 1). Howarth 2 compared the ADCP and HF WERA radar current time series for Liverpool Bay using data collected in 2006.…”

Section: Hf Radar/adcp Comparisonsmentioning

confidence: 99%

“…30 This method is commonly used for tidal analysis 13,15,31,32 as it easily incorporates large gaps and missing data points. This method also has the advantages of being able to pick out the amplitudes and phases of specific frequencies which is especially useful due to the known celestial forcing of the tides, 33 and is less intensive computationally than, for example, a Fast Fourier Transform (FFT).…”

Section: Tidal Analysismentioning

confidence: 99%

“…11 There have been several studies on the current measurement agreement between HF radars and ADCPs as well as other fixed moorings such as current meters and buoys. 2,12,13,14,15,16 These have provided better understanding of the physical processes involved, allowed ongoing performance assessment and motivated improvements in measurement capabilities. They involve the comparison of radar surface current measurements with near surface current (exact depth depending on the particular instruments and deployment) obtained from the in-situ measurement device.…”

Section: Introductionmentioning

confidence: 99%

“…These studies share similar characteristics with Liverpool Bay and/or the HF WERA radar utilised by NOC, as well as comparing a mixture of current radials, dual east (u) and west (v) current components, and dual current vectors. Types of radar and fixed mooring vary and include the Ocean Surface Current Radar (OSCR), 12,13 the Coastal Ocean Dynamics Applications Radars (CODAR), 12,15,16 and the WEllan RAdar (WERA radar). 2 In spite of all these studies there remains some scepticism about the accuracy of HF radar current measurements and it is hoped this two-year comparison will provide further solid evidence to confirm the place of HF radar as an operational current measurement technology.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A two year comparison between HF radar and ADCP current measurements in Liverpool Bay

Robinson

Wyatt

Howarth

2011

Journal of Operational Oceanography

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Assimilation of high‐frequency radar currents in a nested model of the West Florida Shelf

Barth¹,

Alvera‐Azcárate²,

Weisberg³

2008

J. Geophys. Res.

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[1] High-frequency radar currents are assimilated in a West Florida Shelf (WFS) model based on the Regional Ocean Model System (ROMS), which is nested in the Atlantic Hybrid Coordinate Ocean Model (HYCOM) for the purpose of including both local and deep-ocean forcing, particularly the Gulf of Mexico Loop Current. Tides are not included in this model. An ensemble simulation of the WFS model is carried out under different wind-forcings in order to estimate the error covariance of the model state vector and the covariance between ocean currents and winds. Radial currents measured by high-frequency radar antennas near Saint Petersburg and Venice, Florida, USA, are assimilated using this ensemble-based error covariance. Different assimilation techniques using a time-average ensemble, a filter to reduce surface-gravity waves and an extended state vector including wind stress were tested. Results of the WFS model assimilating surface currents show an improvement of the model currents not only at the surface but also at depth.

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A comparison of near-surface current measurements by ADCP and HF-radar on the West Florida shelf

Cited by 9 publications

References 12 publications

Accuracy of surface current velocity measurements obtained from HF radar in Corpus Christi Bay, Texas

Accuracy of surface current velocity measurements obtained from HF radar in Corpus Christi Bay, Texas

A two year comparison between HF radar and ADCP current measurements in Liverpool Bay

Assimilation of high‐frequency radar currents in a nested model of the West Florida Shelf

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