Study of the surface water circulation in San Blas channel (Argentina) using landsat imagery

Author:

Beigt Débora1,Cuadrado Diana G.2,Piccolo María C.3

Affiliation:

1. CONICET, Argentina

2. CONICET, Argentina; Universidad Nacional del Sur, Argentina

3. Universidad Nacional del Sur, Argentina; Universidad Nacional del Sur, Argentina

Abstract

This paper deals with the application of satellite images to study turbidity and water circulation patterns in San Blas channel during a theoretical tidal cycle. Eight Landsat TM and ETM images acquired under clear-sky conditions and representing different tidal stages were selected from a pool of Landsat images provided by the argentinean National Commission of Space Activities (CONAE) and the US Geological Survey. Standard digital image processing techniques were used to perform geometric and radiometric corrections on the visible and near-infrared bands. An image-based atmospheric correction (COST method by CHAVEZ, 1996) was applied. An ISODATA unsupervised classification was performed in order to identify different turbidity levels throughout the channel and adjacent areas. The results suggest that suspended sediment transport towards the channel mouth by ebb currents occurs along both flanks. These currents carry suspended sediment into the open sea, generating an ebb tidal delta which tends to rotate in a clockwise direction. Flood currents trigger turbidity mostly over the southern flank of the channel, generating a flood tidal delta with elongated banks extending in the direction of the tidal currents. From the elongated shape of the turbidity plumes, general tidal circulation patterns were identified.

Publisher

FapUNIFESP (SciELO)

Subject

Oceanography

Reference45 articles.

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3. Actas del VIII Simposio Latinoamericano de Oceanografía Biológica;ALVAREZ J. A.,1983

4. Actas III del IX Congreso Geológico Argentino;AMBROSINI G. L,1984

5. Protocolo para el preprocesamiento de imágenes satelitales Landsat para aplicaciones de la Administración de Parques Nacionales,2005

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