Phone: +34 91 885 66 54 Address: Dep. of Signal Theory and Communications Universidad de Alcalá Escuela Politécnica Superior Campus Universitario s/n 28805 Alcalá de Henares Madrid Spain
In this paper risk maps of encountering extreme sea state, especially individual high and steep o... more In this paper risk maps of encountering extreme sea state, especially individual high and steep ocean waves, are derived from satellite radar images acquired globally during a month of southern winter. Since 1991 the synthetic aperture radar (SAR) onboard the ERS-1/2 satellites have recorded some 1400 ocean wave spectra of the sea surface every day, the high resolution radar images
Abstract. This paper presents the remote sensing techniques of measuring sea states, currents and... more Abstract. This paper presents the remote sensing techniques of measuring sea states, currents and bathymetry by using an X-band nautical radar. It briefly describes the fundamental methods to infer sea state information (eg ocean wave and current ...
... Jose C Nieto-Borge*, Katrin Hessner**, Pilar Jarabo-Amores*, and David de la Mata Moya* *Grou... more ... Jose C Nieto-Borge*, Katrin Hessner**, Pilar Jarabo-Amores*, and David de la Mata Moya* *Group of High Frequency Technologies, Dpt. ... [2] F. Ziemer, C. Brockmann, RA Vaughan, J.Seemann, and CM Senet, Radar survey of near shore bathymetry within the OROMA project. ...
2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
ABSTRACT The wave and current monitoring system WaMoS II is a remote sensing system based on a na... more ABSTRACT The wave and current monitoring system WaMoS II is a remote sensing system based on a nautical X-Band radar generally used for navigation and ship traffic control. It has been used in recent years to monitor sea state information from moored platforms, coastal sites and moving vessels. The nautical radar can scan the sea surface over a large area (~ 10km2) with a high spatial (~7.5m) and temporal resolution (~2s). Analysing the temporal and spatial evolution of the surface wave information it is also possible to determine current and water depth information in space and time. In the paper a brief introduction into the measuring principle of WaMoS II is given and results of high resolution current and bathymetric maps for a shallow water area (<;20m) are presented. For the first time a detailed validation the WaMoS II current measurements by using in-situ ADCP measurements is presented.
Journal of Atmospheric and Oceanic Technology, 2018
The properties of directional distributions in ocean wave spectra are studied, with an emphasis o... more The properties of directional distributions in ocean wave spectra are studied, with an emphasis on sea states with bimodal directional distributions in the high-frequency tails of single-peaked wave systems. A peak-splitting tendency has been a challenge in the interpretation of results from some data-adaptive estimation methods. After a survey of the theory, mathematical and numerical explanations are presented regarding domains of uni- and bimodality for symmetric Burg and Shannon maximum entropy methods. The study finds that both the Burg and Shannon maximum entropy methods have a tendency to split peaks, and that the domains of uni- and bimodality for these two methods depend on the Fourier coefficients input into the algorithms. Comparisons of data-adaptive methods based on data collected near the Ekofisk oil field in the North Sea and from nonlinear wave simulations are presented. The maximum likelihood (ML) method, the iterative maximum likelihood (IML) method, and the Burg a...
In this paper risk maps of encountering extreme sea state, especially individual high and steep o... more In this paper risk maps of encountering extreme sea state, especially individual high and steep ocean waves, are derived from satellite radar images acquired globally during a month of southern winter. Since 1991 the synthetic aperture radar (SAR) onboard the ERS-1/2 satellites have recorded some 1400 ocean wave spectra of the sea surface every day, the high resolution radar images
Abstract. This paper presents the remote sensing techniques of measuring sea states, currents and... more Abstract. This paper presents the remote sensing techniques of measuring sea states, currents and bathymetry by using an X-band nautical radar. It briefly describes the fundamental methods to infer sea state information (eg ocean wave and current ...
... Jose C Nieto-Borge*, Katrin Hessner**, Pilar Jarabo-Amores*, and David de la Mata Moya* *Grou... more ... Jose C Nieto-Borge*, Katrin Hessner**, Pilar Jarabo-Amores*, and David de la Mata Moya* *Group of High Frequency Technologies, Dpt. ... [2] F. Ziemer, C. Brockmann, RA Vaughan, J.Seemann, and CM Senet, Radar survey of near shore bathymetry within the OROMA project. ...
2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
ABSTRACT The wave and current monitoring system WaMoS II is a remote sensing system based on a na... more ABSTRACT The wave and current monitoring system WaMoS II is a remote sensing system based on a nautical X-Band radar generally used for navigation and ship traffic control. It has been used in recent years to monitor sea state information from moored platforms, coastal sites and moving vessels. The nautical radar can scan the sea surface over a large area (~ 10km2) with a high spatial (~7.5m) and temporal resolution (~2s). Analysing the temporal and spatial evolution of the surface wave information it is also possible to determine current and water depth information in space and time. In the paper a brief introduction into the measuring principle of WaMoS II is given and results of high resolution current and bathymetric maps for a shallow water area (<;20m) are presented. For the first time a detailed validation the WaMoS II current measurements by using in-situ ADCP measurements is presented.
Journal of Atmospheric and Oceanic Technology, 2018
The properties of directional distributions in ocean wave spectra are studied, with an emphasis o... more The properties of directional distributions in ocean wave spectra are studied, with an emphasis on sea states with bimodal directional distributions in the high-frequency tails of single-peaked wave systems. A peak-splitting tendency has been a challenge in the interpretation of results from some data-adaptive estimation methods. After a survey of the theory, mathematical and numerical explanations are presented regarding domains of uni- and bimodality for symmetric Burg and Shannon maximum entropy methods. The study finds that both the Burg and Shannon maximum entropy methods have a tendency to split peaks, and that the domains of uni- and bimodality for these two methods depend on the Fourier coefficients input into the algorithms. Comparisons of data-adaptive methods based on data collected near the Ekofisk oil field in the North Sea and from nonlinear wave simulations are presented. The maximum likelihood (ML) method, the iterative maximum likelihood (IML) method, and the Burg a...
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