Abstract
The spatial and temporal variability observed during the last 25 years at Punta Rasa sandspit is studied in this work. Five images Lansat TM (30 m spatial resolution) corresponding to the years 1987, 1994, 2001, 2007 and 2011 were selected in this study. Each one covers an area of 185 km x 172 km but, for this analysis, a smaller area from latitude 36°19´40” to 36°17´08” S and from longitude 56°44´10” to 56°47´25” S was selected. A remarkable retrogression of the sandspit and a gradual widening of the sector located adjacently southward the sandspit was observed by comparison of the selected images. The hypothesis discussed in this work is that such variability would be associated to a change in the wind wave climate which arose a slight change in the long shore wave energy flux and in sand transport. Finally, it is highlighted that the mean sea level rise and the increasing in frequencies and intensities of storm surges in the Río de la Plata could play an important role in the observed erosion.
Highlights
Resumen: En este trabajo se estudia la evolución espacio-temporal de la espiga arenosa de Punta Rasa-Punta Médanos durante los últimos 25 años
De la comparación de las imágenes satelitales seleccionadas se pudo observar la decapitación de la espiga arenosa acompañada del progresivo ensanchamiento del sector ubicado adyacentemente al S del extremo distal de la misma
Aunque no se disponga de mediciones extensivas ni sistemáticas de parámetros ambientales costeros en el litoral arenoso del NE bonaerese, distintos estudios coinciden en determinar que el transporte neto de arena paralelo a la costa tiene una dirección predominante hacia el N (Caviglia, 1991; Kokot, 1997; 2010)
Summary
Resumen: En este trabajo se estudia la evolución espacio-temporal de la espiga arenosa de Punta Rasa-Punta Médanos durante los últimos 25 años. La hipótesis que se discute en este trabajo es que dicha variabilidad estaría asociada a una alteración local del clima de olas el cual trajo aparejado un leve cambio del flujo de energía de olas y del transporte de arena paralelos a la costa.
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