Are wind wave heights increasing in south-eastern south American continental shelf between 32°S and 40°S?

Dragani, Walter C.; Martin, P.; Simionato, Claudia G.; Campos, M. I.

doi:10.1016/j.csr.2010.01.002

Cited by 44 publications

(27 citation statements)

References 43 publications

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“…In addition, an enhancement of the easterly winds during summer and winter months over the Río de la Plata estuary and the adjacent continental shelf was reported by Simionato et al (). Statistics of surface winds observed in Buenos Aires City (Figure ) showed a small increase in the easterly winds' frequency and speed between 1981–1990 and 1991–2000 (Dragani et al , ). However, for a consistent wind trend climatic analysis, long period data set is required.…”

Section: Introductionmentioning

confidence: 99%

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

2015

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Surface scalar wind speed trends (from 1979 to 2009) at the southwestern Atlantic Ocean, between 33° and 50°S and 55° and 70°W, were estimated from the NCEP/NCAR I (NR1) and the Climate Forecast System Reanalysis (CFSR) using Sen's slope. Trends were tested using the seasonal Mann–Kendall test. Scalar wind speed trends computed from NR1 database were positive throughout the whole study area, with values ranging from +0.01 to +0.03 m s−1 year−1. On the contrary, wind speed trends computed from CFSR database were rather different to trends obtained from NR1 reanalysis. Wind speed and sea surface temperature (SST) trend patterns, both computed from CFSR database, seem to be quite consistent but, in general, no apparent relationship between both patterns was obtained when different global databases were analysed. Sea surface wind speed data compiled from multiple satellite observations were also used to compute wind speed trends. Computed satellite trends resulted in very good agreement with positive values obtained from NR1 database. NR1 data series presented significant inter‐annual to multi‐decadal oscillations at the Argentinean continental shelf, but they would not seem to be associated either with the Southern Annular Mode or with El Niño Southern Oscillation. Possible impacts of positive speed wind trends on the mean depth of the ocean mixed layer and on the wind wave climate are briefly discussed.

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Section: Introductionmentioning

confidence: 99%

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

2015

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“…Changes in frequency, duration, and wave height during storms were observed in Argentina (D'Onofrio et al 2008;Fiore et al 2009;Dragani et al 2010) as well as in other coastal regions related to the global climate change (Wu et al 2002;Dolan and Walker 2006;Frazier et al 2010). The categories of the indicator (Table 1) were established based on the morphological and volumetric changes registered in the beaches (Merlotto et al 2013).…”

Section: Used Are Defined Belowmentioning

confidence: 99%

Hazard, vulnerability and coastal erosion risk assessment in Necochea Municipality, Buenos Aires Province, Argentina

2016

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This contribution determines the coastal erosion risk of Necochea and Quequén cities, Necochea Municipality, Buenos Aires Province (Argentina). Both risk components, hazard and vulnerability, were assessed by the construction of indices. The hazard index is composed of four indicators: the erosion or accretion rate, coastal geomorphology, storm waves effects, and sediment supply. The vulnerability index is comprised of land use/cover, demographic, life conditions, and work and consumption indicators, and includes population census data such as demographic, education, health, sanitary, economic, production, work and population exposure aspects. The analysis concluded that coastal erosion risk ranges from very low to high along the study area, Quequén yielding the highest values. Risk levels vary in both cities based on the uneven spatial distribution of hazard. The risk assessment developed herein constitutes a practical and adequate tool that can be utilized with other elements and tasks in the elaboration of a coastal management program.

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“…Estudios basados en modelaciones numéricas sostienen que, como resultado de esta ligera perturbación de la circulación atmosférica, el oleaje se ha modificado sensiblemente (cox and Swail, 2001;dragani et al, 2008;dragani et al, 2010;Young et al, 2011;dragani et al, 2013). Los resultados indican que el oleaje proveniente del E y del ESE presentaría una mayor frecuencia de ocurrencia y una mayor altura en la región del río de la Plata Exterior.…”

Section: Materiales Y Métodosunclassified

Geomorphological evolution of Punta Rasa, Province of Buenos Aires, Argentina

Dragani

Codignotto

Romero

et al. 2014

MACN

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IntroduccIónPunta rasa es el extremo distal de una espiga de barrera, que como formación sedimentaria constituida por una serie de cordones litorales, se extiende desde su sector proximal en Punta Médanos ( Fig. 1) hacia el norte (Kokot, 2010). Esta proyección del sector distal de la espiga históricamente mostró una dirección de crecimiento predominante hacia el no (Bértola, 1995(Bértola, , 2001).Sin embargo, desde hace poco más de una década esta elongada formación arenosa, manifiesta un cambio notable en su morfología. En el análisis de la evolución del extremo distal de la espiga, desde fines del siglo XX, este tramo mostró un cambio espacio-temporal muy evidente que se aprecia claramente no sólo mediante la comparación de fotografías aéreas e imágenes satelitales (dragani et al., 2012) 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.Key words: Erosion, Sandspit, climate change, rasa Point, Bonarense coast.Resumen: En este trabajo se estudia la evolución espacio-temporal de la espiga arenosa de Punta rasa-Punta Médanos durante los últimos 25 años. Se seleccionaron cinco imágenes Lansat tM con resolución espacial de 30 m, correspondientes a los años 1987, 1994, 2001, 2007 y 2011. cada imagen cubre un área de aproximadamente 185 km x 172 km pero para este trabajo se recortó un área menor comprendida entre las latitudes 36°19´40" y 36°17´08" S y las longitudes 56°44´10" y 56°47´25" S. 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. 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. Finalmente, se destaca que el ascenso del nivel medio del mar y el aumento en la frecuencia e intensidad de la onda de tormenta en el río de la Plata podrían contribuir al aumento de erosión observado.

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Are wind wave heights increasing in south-eastern south American continental shelf between 32°S and 40°S?

Cited by 44 publications

References 43 publications

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

Hazard, vulnerability and coastal erosion risk assessment in Necochea Municipality, Buenos Aires Province, Argentina

Geomorphological evolution of Punta Rasa, Province of Buenos Aires, Argentina

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