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|SAR observation of rip currents off the Portuguese coast|
|da Silva, J.C.B. (2008). SAR observation of rip currents off the Portuguese coast, in: Barale, V. et al. (Ed.) (2008). Remote sensing of the European seas. pp. 399-410|
|In: Barale, V.; Gade, M. (Ed.) (2008). Remote sensing of the European seas. Springer Science+Business Media: Heidelberg. ISBN 978-1-4020-6771-6. XXII, 514 pp., more|
Rip currents; Synthetic aperture radar; ANE, Portugal [gazetteer]; Marine
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Signatures of rip currents can be identified in SAR images and aerial photographs of the near-shore. An area on the Portuguese West coast (bathymetry and wave climate of which are briefly described) was studied. An image corresponding to low wind speed conditions is shown, where a series of rip-like cell features are consistent with rip current morphology. A simple model is presented to explain the signatures, based on wind contrast due to the relative water motion within rip currents. The model is discussed for near-threshold wind conditions of Bragg wave excitation.