Eugenio Pugliese Carratelli                     

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Active (i.e. Radar) Satellite remote sensing data of the sea have been employed for many years for wind and sea state analysis; there is still a lot to be done, however, in order to improve the scope and the accuracy of their applications. The understanding of sea state and wind velocity from altimeter  and SAR   data  - as well as, possibly from  scatterometer  - is indeed  far from perfect, mostly because the effect of foam and spray on the scattering properties is not clear. 

 

A simple description of the techniques involved is given (in Italian) on GuardiaPiemontese2012 

 

Some of the work is based  on the pseudo random numerical generation of the water surface to simulate active sensor response.  The basic idea - i.e. to simulate a great number of sea surface realisations and to evaluate the scattering coefficient by ensemble averaging the statistics of surface tilt an other parameters -is  not new in principle and it dates back to 1990 (Bruening et al.).  It has however been improved and extended  to wave lengths down of the order of one meter, well under SAR pixel size, thus allowing a better representation of sub pixel  phenomena.

Some description of the work carried out on this field is described in papers presented - mostly - at specialised ESA-ESRIN seminars:

ENVISATFrascati2006   Montreux2007    Seasar2008

A similar approach was followed, as early as 2000, for the radar altimeter wave form reconstruction:

EsaGothenborg2000

 

 

More recently whitecapping  and floating foam has been taken into account; the radar cross section of a wave field under strong wind derives from the presence of foam as much as if not more from  capillary wave  roughness. Thus, before an effective local backscattering model can be successfully employed to reconstruct wave information from SAR, the behaviour of foam must be correctly modelled and its local backscattering properties  have to be properly quantified. See RemoteSensing2014

  

A peculiar aspects of the work concerns the application of hurricane data through the participation to the "RADARSAT Hurricane Applications Project Workshop",   led by the Canadian Space Agency; the  it is hoped that scattering data on a fully foam and spray covered sea as it is mostly likely to be during an hurricane may provide information on the scattering behaviour of the foam covered fraction of less strong sea states.   

A Report2010 produced in cooperation with Luis Cordoba (CUJAE , Havana - CUBA) and Francisco J. Ocampo Torres (CICESE-Ensenada MEXICO) provides some information

 

A different -if closely related - line of work is aimed at direct applications to engineering problems, and results have been presented at  International Seminars,  congresses and published on papers:

 

On SAR applications:   ArabianCoastDubai05  IAHRVenice2007 

 

On Altimeter : Koweit2008  PIANCPalermo2008  BARCELONA2009  ChennaiCOPEDEC2012  GuardiaPiemontese2012 Journal of Coastal Research GuardiaPiemontese2015  Venice2013SurgeCuba  Ginevra2014SurgeCuba

The following presentations may provide a clearer idea of the work being carried out

 

 ppt presentation  at a Palermo PIANC

 presented at the Italian Meteo Office (In Italian)

ChennaiCOPEDEC2012presentation

www.aiom.info/documentsfordownloads/STUDI_AIOM_PALERMO_2014/presentazionePA2014.pdf

 

 

 

 

Most of the work has been carried out by Ferdinando Reale, Fabio Dentale and Giuseppe Spulsi. In the past, also  Maria Rosaria Della Rocca and Claudia Giarrusso have greatly contributed to this line of research.

 

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Last revised 2016 EPC