Výsledky vyhledávání - "Klaus-Werner Gurgel"

Akademický článek

Wind Direction Inversion from Narrow-Beam HF Radar Backscatter Signals in Low and High Wind Conditions at Different Radar Frequencies

Autor: Wei Shen, Klaus-Werner Gurgel

Publikováno v: Remote Sensing, Vol 10, Iss 9, p 1480 (2018)

Land-based, high-frequency (HF) surface wave radar has the unique capability of monitoring coastal surface parameters, such as current, waves, and wind, up to 200 km off the coast. The Doppler spectrum of the backscattered radar signal is characteriz

Externí odkaz: https://doaj.org/article/8d101d815b0246e0a4c877809bb25fe3

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First Results on Measuring Surface Current Velocities with WERA HF Radar in MIMO Configuration at Cape Hatteras

Autor: Leif Petersen, Dana K. Savidge, Klaus-Werner Gurgel, Roberto Gomez, Anna Dzvonkovskaya, Thomas Helzel, Gabriel Matthias

Publikováno v: 2019 IEEE/OES Twelfth Current, Waves and Turbulence Measurement (CWTM).

Preliminary results are presented on the mapping of surface current velocities measured by two WERAs operating in MIMO configuration. The systems operated by the Skidaway Institute of Oceanography are part of an NSF funded network of instruments depl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f83b5cfd65e8a564f69b328a5bd8033
https://doi.org/10.1109/cwtm43797.2019.8955144

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High-Frequency Radars: Beamforming Calibrations Using Ships as Reflectors*

Autor: Cédric Chavanne, X. Flores-Vidal, Pierre Flament, Reginaldo Durazo, Klaus-Werner Gurgel

Publikováno v: Journal of Atmospheric and Oceanic Technology. 30:638-648

Linear array antennas and beamforming techniques offer some advantages compared to direction finding using squared arrays. The azimuthal resolution depends on the number of antenna elements and their spacing. Assuming an ideal beam pattern and no amp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c06f3db78d5a09ba24d683d6b6b74e2
https://doi.org/10.1175/jtech-d-12-00105.1

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Wind-speed inversion from HF radar first-order backscatter signal

Autor: Detlef Stammer, Wei Shen, T. Schlick, George Voulgaris, Klaus-Werner Gurgel

Publikováno v: Ocean Dynamics. 62:105-121

Land-based high-frequency (HF) radars have the unique capability of continuously monitoring ocean surface environments at ranges up to 200 km off the coast. They provide reliable data on ocean surface currents and under slightly stricter conditions c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::64022ddd086d6e7ac81a0b07203e00a6
https://doi.org/10.1007/s10236-011-0465-9

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Tidal and wind-driven surface currents in the German Bight: HFR observations versus model simulations

Autor: Alexander Port, Joanna Staneva, Emil V. Stanev, Klaus-Werner Gurgel, Johannes Schulz-Stellenfleth

Publikováno v: Ocean Dynamics
Port, A.; Gurgel, K.-W.; Staneva, J.; Schulz-Stellenfleth, J.; Stanev, E.V.: Tidal and wind-driven surface currents in the German Bight: HFR observations versus model simulations. In: Ocean Dynamics. Vol. 61 (2011) 10, 1567-1585. (DOI: 10.1007/s10236-011-0412-9)

Tidal and wind-driven surface currents in the German Bight between shallow mudflats of the North Frisian islands and the island of Helgoland are studied using coastal high-frequency radar (HFR) observations and hindcasts from a primitive equation num

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68c161d697ccc10feac7c028cb925b73
https://doi.org/10.1007/s10236-011-0412-9

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Simulation and detection of tsunami signatures in ocean surface currents measured by HF radar

Autor: Eric W. Gill, Anna Dzvonkovskaya, T. Schlick, Thomas Pohlmann, Klaus-Werner Gurgel

Publikováno v: Ocean Dynamics. 61:1495-1507

High-frequency (HF) surface wave radars provide the unique capability to continuously monitor the coastal environment far beyond the range of conventional microwave radars. Bragg-resonant backscattering by ocean waves with half the electromagnetic ra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2cdc9e36c089c7162d1d1d4019aaadb8
https://doi.org/10.1007/s10236-011-0420-9

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Observations of Vortex Rossby Waves Associated with a Mesoscale Cyclone*

Autor: Cédric Chavanne, Pierre Flament, Klaus-Werner Gurgel, Douglas S. Luther

Publikováno v: Journal of Physical Oceanography. 40:2333-2340

Short-wavelength (L ∼ 100 km) Rossby waves with an eastward zonal phase velocity were observed by high-frequency radio Doppler current meters and moored ADCPs west of Oahu, Hawaii, during spring 2003. They had Rossby numbers Ro = |ζ/f| = O(1), per

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::56e4b134e2f6c49d616b9069d1fbdcc8
https://doi.org/10.1175/2010jpo4495.1

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The Surface Expression of Semidiurnal Internal Tides near a Strong Source at Hawaii. Part I: Observations and Numerical Predictions*

Autor: Douglas S. Luther, Pierre Flament, Mark A. Merrifield, Edward D. Zaron, Klaus-Werner Gurgel, Glenn S. Carter, Cédric Chavanne

Publikováno v: Journal of Physical Oceanography. 40:1155-1179

Observations of semidiurnal currents from high-frequency radio Doppler current meters and moored acoustic Doppler current profilers (ADCPs) in the Kauai Channel, Hawaii, are described and compared with two primitive equation numerical models of the t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dd9b4c16b3c7876bcd99a6b1a99cb882
https://doi.org/10.1175/2010jpo4222.1

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The Surface Expression of Semidiurnal Internal Tides near a Strong Source at Hawaii. Part II: Interactions with Mesoscale Currents*

Autor: Douglas S. Luther, Klaus-Werner Gurgel, Cédric Chavanne, Pierre Flament

Publikováno v: Journal of Physical Oceanography. 40:1180-1200

Observations of semidiurnal surface currents in the Kauai Channel, Hawaii, are interpreted in the light of the interaction of internal tides with energetic surface-intensified mesoscale currents. The impacts on internal tide propagation of a cyclone

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f8b8c4ee252124f8224559ea245062d8
https://doi.org/10.1175/2010jpo4223.1

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Ensemble perturbation smoother for optimizing tidal boundary conditions by assimilation of High-Frequency radar surface currents – application to the German Bight

Autor: Klaus-Werner Gurgel, Aida Alvera-Azcárate, Alexander Barth, Emil V. Stanev, Joanna Staneva, Jean-Marie Beckers, Alexander Port

Publikováno v: Scopus-Elsevier
Barth, A.; Alvera-Azcarate, A.; Gurgel, K.-W.; Staneva, J.; Port, A.; Beckers, J.-M.; Stanev, E.V.: Ensemble perturbation smoother for optimizing tidal boundary conditions by assimilation of High-Frequency radar surface currents – application to the German Bight. In: Ocean Science. Vol. 6 (2010) 1, 161-178. (DOI: 10.5194/os-6-161-2010)
Ocean Science, Vol 6, Iss 1, Pp 161-178 (2010)

High-Frequency (HF) radars measure the ocean surface currents at various spatial and temporal scales. These include tidal currents, wind-driven circulation, density-driven circulation and Stokes drift. Sequential assimilation methods updating the mod

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::355ed48afbb807f85d219ec7a34a6046
https://doi.org/10.5194/os-6-161-2010

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