Publicações

Nieto Borge, J.C., Sanz González, R., Hessner, K., Reichert, K. e Guedes Soares, C. (2000), “Estimation of Sea State Directional Spectra by Using Marine Radar Imaging of Sea Surface", Proceedings of the 19th International Conference on Offshore Mechanics and Arctic Engineering (OMAE´00), Guedes Soares, C. (Eds.), 14-17 February, 2000, New Orleans, Louisiana, USA, ASME, New York, Paper OMAE2000-S&R – 6120

Conventional marine radars are able to obtain images of the sea surface, commonly known as sea clutter, which contain information about the wave field. The present work shows how these marine radars are used as a remote sensing tool for monitoring sea states in real time. The full Wave Monitoring System is composed by an ordinary X-band navigation radar unit, an A/D converter to sample the analog radar video signal and a computer that deals with the processing of information and communication transference in real time. Each marine radar measurement of the sea surface is a temporal sequence of images. Hence, these data sets contain information about the spatial and temporal dependence of the sea states. The data are transformed in the spectral domain (wave numbers and frequencies) in order to derive the sea state parameters, such as significant wave heights, wave periods, wave propagation directions, etc. In the present work, the results obtained from the analysis of the nautical radar data sets are compared with data measured by conventional in-situ sensors, such as anchored wave buoys. These data were taken in different geographical locations: the Northern coast of Spain, where the swell is the dominant wave field, and several points in the North Sea, where the wind sea energy is commonly higher than the swell components.

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