Wind-wave climate change and increasing erosion in the outer R铆o de la Plata, Argentina

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• 作者：Jorge O. Codignotto^a ; ^b ; Walter C. Dragani^b ; ^c ; ^d ; ^e ; ^{dragani@hidro.gov.ar} ; Paula B. Martin^b ; ^c ; ^d ; Claudia G. Simionato^d ; ^e ; ^f ; Rubé ; n A. Medina^g ; Guadalupe Alonso^d
• 关键词：Samborombó ; n Bay ; Rí ; o de la Plata ; Erosion ; Wind-wave climate change ; SWAN wave model
• 刊名：Continental Shelf Research
• 出版年：2012
• 期刊代码：18_02784343
• 类别：ear
• 出版时间：15 April, 2012
• 卷：38
• 期：Complete
• 页码：110-116
• 文件大小：750 K

摘要

The coastal area of Samboromb贸n Bay ends in a short cliff which, during the last decades, has been undergoing an increased retrogression of approximately 8.2 m decade^鈭?. The aim of this paper is to investigate whether this accelerated erosion can be related to an apparent wind-wave climate change, which has been recently reported for the R铆o de la Plata region. A numerical study with SWAN wave model for the period 1971-2005 drives to positive trends in the frequency of occurrence and heights of waves propagating from the E and ESE. Particularly, the number of cases of high waves from those directions displays a significant increment. In addition, previous papers have reported an increment of the frequency, height and duration of the storm surges in the R铆o de la Plata, so as a rise of the mean sea level in the region. It is concluded that the combination of those three factors acting together constitutes a powerful and effective mechanism which is likely responsible for the observed increasing erosion in Samboromb贸n Bay.