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Morphological variability of sandy beaches due to variable oceanographic conditions: a study case of oceanic beaches of Rio de Janeiro city (Brazil)
Journal of Coastal Conservation ( IF 2.1 ) Pub Date : 2021-03-01 , DOI: 10.1007/s11852-021-00821-8
Breylla Campos Carvalho , Flavia Moraes Lins-de-Barros , Priscila Linhares da Silva , Juliana do Nascimento Pena , Josefa Varela Guerra

Due to their overall east-west orientation, the Rio de Janeiro oceanic urban beaches are exposed to high energy meteoceanographic events, exhibiting large spatial and temporal morphodynamic variability that affect their use and functionality. The main goals of this study are to describe the morphology of these sandy beaches and to evaluate their response to different oceanographic conditions. Between 2016 and 2018 quasi-monthly monitoring surveys, comprising topographic and sedimentological sampling, were carried out at 21 sites distributed along Macumba, Recreio-Barra da Tijuca, São Conrado, Leblon-Ipanema-Arpoador and Copacabana-Leme beaches. During this period, 29 storm events were recorded by an oceanographic buoy near the study area (~20 m depth). The most energetic event occurred between 11 and 14 August 2017 and caused widespread morphological changes, as the 45 m retreat at the Recreio-Barra beach eastern sector. Overall, mean grain size decreases from west to east varying from coarse to medium sand. The topographic record shows decreasing slope and increasing width from west to east, except in the Leblon-Ipanema-Arpoador beaches, where beach rotation was documented. The main findings were the interannual variability trends to beach morphometric records, the period each beach needs to recover its mean width after erosional events and how severe are storm impacts. Besides contributing to the morphodynamic understanding of the studied beaches, new understandings of the impacts of storm events and the subsequent recovery of sandy beaches are presented.



中文翻译:

由于海洋条件变化而引起的沙滩形态变化:以里约热内卢市(巴西)海洋沙滩为例

由于它们总体上是东西方向,所以里约热内卢的海洋城市海滩暴露于高能的气象学事件中,表现出较大的时空形态动力学变异性,从而影响其使用和功能。这项研究的主要目的是描述这些沙滩的形态,并评估它们对不同海洋条件的反应。在2016年至2018年之间,在Macumba,Recreio-Barra da Tijuca,SãoConrado,Leblon-Ipanema-Arpoador和Copacabana-Leme海滩分布的21个地点进行了包括地形和沉积学采样的准每月监测调查。在此期间,研究区域附近(约20 m深度)的海洋浮标记录了29次风暴事件。最活跃的事件发生在2017年8月11日至14日之间,引起了广泛的形态变化,这是Recreio-Barra海滩东部地区的45 m撤退​​。总体而言,平均粒度从西向东减小,从粗砂到中砂不等。地形记录显示,倾斜度从西向东减小,宽度从西向东增大,除了在Leblon-Ipanema-Arpoador海滩记录有海滩旋转的地区外。主要发现是海滩形态记录的年际变化趋势,侵蚀事件发生后每个海滩恢复其平均宽度所需的时间以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。作为Recreio-Barra海滩东部地区的45 m静修区。总体而言,平均粒度从西向东减小,从粗砂到中砂不等。地形记录显示,倾斜度从西向东减小,宽度从西向东增大,除了在Leblon-Ipanema-Arpoador海滩记录有海滩旋转的地方。主要发现是海滩形态记录的年际变化趋势,侵蚀事件发生后每个海滩恢复其平均宽度所需的时间以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。作为Recreio-Barra海滩东部的45 m静修区。总体而言,平均粒度从西向东减小,从粗砂到中砂不等。地形记录显示,倾斜度从西向东减小,宽度从西向东增大,除了在Leblon-Ipanema-Arpoador海滩记录有海滩旋转的地区外。主要发现是海滩形态记录的年际变化趋势,侵蚀事件发生后每个海滩恢复其平均宽度所需的时间以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。地形记录显示,倾斜度从西向东减小,宽度从西向东增大,除了在Leblon-Ipanema-Arpoador海滩记录有海滩旋转的地区外。主要发现是海滩形态记录的年际变化趋势,侵蚀事件发生后每个海滩恢复其平均宽度所需的时间以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。地形记录显示,倾斜度从西向东减小,宽度从西向东增大,除了在Leblon-Ipanema-Arpoador海滩记录有海滩旋转的地区外。主要发现是海滩形态记录的年际变化趋势,侵蚀事件发生后每个海滩恢复其平均宽度所需的时间以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。每个海滩在侵蚀事件发生后需要恢复平均宽度的时间,以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。每个海滩在侵蚀事件发生后需要恢复平均宽度的时间,以及风暴影响的严重程度。除了有助于对所研究海滩的形态动力学理解外,还提出了对风暴事件影响和随后的沙滩恢复的新认识。

更新日期:2021-03-01
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