A New Empirical Approach to Detect Surface Currents Using Doppler Marine Radar

Nyman, Lisa; Lund, Björn; Romeiser, Roland; Graber, Hans C.; Horstmann, Jochen

doi:10.1109/cwtm43797.2019.8955291

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The MR was mounted on a tower on top of the R/V Walton Smith wheelhouse at 12.5 m above sea level with an unobstructed 360° field of view. Here, only its backscatter intensity measurements are used, but others have used HZG MR Doppler velocities to determine significant wave height (Carrasco et al, ) and surface currents (Nyman et al, ).…”

Section: Data Overviewmentioning

confidence: 99%

Marine X‐Band Radar Currents and Bathymetry: An Argument for a Wave Number‐Dependent Retrieval Method

et al. 2020

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This study evaluates shipboard marine X‐band radar (MR) near‐surface current and bathymetry measurements under shallow water conditions. The retrieval algorithm is based on the surface wave signal within three‐dimensional wave number frequency MR backscatter intensity variance spectra. The MR data were collected during a research cruise that investigated submesoscale processes and their impact on oil spill transport in the Louisiana Bight. The MR currents and bathymetry are validated using measurements from 500 GPS‐equipped surface drifters, a shipboard acoustic Doppler current profiler, and a shipboard single‐beam echo sounder. Earlier results from the same experiment but using a different set of sensors indicate strong upper ocean vertical current shear over a 3.5 hr period, despite only mild wind forcing. Here, the MR currents are derived as a function of wave number, providing a measure of vertical shear for the full duration of the cruise. Strong vertical shear is frequently observed, with a maximum difference of 0.42 m/s between the MR high (effective depth of ∼0.9 m) and low ( ∼2.4 m) wave number bins. Treating the drifter and echo sounder measurements as truth, the accuracies of the MR near‐surface currents and bathymetry are 0.04–0.07 m/s and 1.2 m (or 7% of the mean water depth). However, it is shown that ∼50% of the MR high wave number and drifter current differences is due to vertical shear. The shallow water MR near‐surface current accuracy thus matches findings from a previous deep water validation where vertical shear was much weaker.

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Section: Data Overviewmentioning

confidence: 99%

Marine X‐Band Radar Currents and Bathymetry: An Argument for a Wave Number‐Dependent Retrieval Method

et al. 2020

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“…The other method to measure near-surface currents with DMR employs the Doppler velocity synthesis algorithm (DoVeS). This software was developed to measure near-surface currents around a ship with a resolution of ~326 m in non-overlapping grid boxes (Nyman et al, 2019).…”

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confidence: 99%

Radar Observations of Ocean Surface Features Resulting from Underwater Topography Changes

Nyman¹,

Lund²,

Graber³

et al. 2019

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COSMO-SkyMed™ Product-ASI 2016 processed under license from ASI (Agenzia Spaziale Italiana); all rights reserved. COSMO-SkyMed images were distributed by e-GEOS. TerraSAR-X data were obtained through © DLR e.V. 2016. TerraSAR-X images were distributed by Airbus Defense and Space GmbH; downlinked and processed by CSTARS under Airbus Defense and Space license. Lisa Nyman was funded by the US Office of Naval Research (ONR) under grants N00014-14-1-0630 and N00014-16-1-3147. We thank Samantha Ballard for assisting in the DMR installation on R/V Roger Revelle.

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A New Empirical Approach to Detect Surface Currents Using Doppler Marine Radar

Cited by 2 publications

References 9 publications

Marine X‐Band Radar Currents and Bathymetry: An Argument for a Wave Number‐Dependent Retrieval Method

Marine X‐Band Radar Currents and Bathymetry: An Argument for a Wave Number‐Dependent Retrieval Method

Radar Observations of Ocean Surface Features Resulting from Underwater Topography Changes

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