Abstract
(ricevuto il 10 Novembre 2008; approvato il 30 Marzo 2009; pubblicato online il 25 Giugno 2009)Summary. — Natural and man-made distributions of tensioactive substance con-centrations in the sea surface features exhibit self-similarity at all radar reflectivitylevels when illuminated by SAR. This allows the investigation of the traces producedby vortices and other features in the ocean surface. The man-made oil spills besidesoften presenting some linear axis of the pollutant concentration produced by movingships also show their artificial production in the sea surface by the reduced rangeof scales, which widens as time measured in terms of the local eddy diffusivity dis-torts the shape of the oil spills. Thanks to this, multifractal analysis of the differentbackscattered intensity levels in SAR imagery can be used to distinguish betweennatural and man-made sea surface features due to their distinct self-similar prop-erties. The differences are detected using the multifractal box-counting algorithmon different sets of SAR images giving also information on the age of the spills.Different multifractal algorithms are compared presenting the differences in scalingas a function of some physical generating process such as the locality or the spectralenergy cascade.PACS 92.10.Sx – Coastal, estuarine, and near shore processes.PACS 93.85.Bc – Computational methods and data processing, data acquisitionand storage.
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