Addressing climate extremes in Coastal Management: The case of the Uruguayan coast of the Rio de la Plata System

Verocai, José E.; Gómez-Erache, M.; Nagy, Gustavo J.; Bidegain, Mario

doi:10.5894/rgci555

Cited by 18 publications

(60 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…− ESE wind direction prevails up to about 7 m/s at the coast, whereas for greater speeds SW and WSW directions prevail (Panario et al, 2008). The former mainly occur during spring-summer and the latter during winter, which is supported by the higher frequency of storm surges able to modify the coastal geomorphology (Gutiérrez et al, 2015) reported by Verocai et al (2015), and by wave data showing a close match with the prevailing ESE to SE and S wind and swell directions (Panario et al, 2008). − Sea-level rise (SLR) over the last century reached only 11 cm in Montevideo (Nagy et al, 2007), and, over the previous five decades, above 20 cm in Punta del Este (Nagy et al, 2015) as a result of global climate change and the regional effects of river discharge and winds (Verocai et al, 2015).…”

Section: Resultsmentioning

confidence: 81%

“…Their occurrence from 1921 to 2008 was six times, but only once since 1950. However, Verocai et al (2015) found a slight increase in the occurrence of events greater than 1.89 m AMSL, capable of modifying the coastal morphology, over the last decade. At the same time, a fluctuating trend in atmospheric energy has been observed, verified by storm surges with maximums at the beginning of the 20 th century and minimums between 1960 and 1970, and an increasing trend of the average energy since then, assimilable to the AMO variability (Gutiérrez et al, 2016).…”

Section: Resultsmentioning

confidence: 87%

“…− The frequency of days with winds higher than 8 m/s increases during spring-summer (Nagy et al, 2008a), whereas the average wind speed and anomaly slightly increase (Nagy et al, 2003;2008b) during El Niño-La Niña (Gutiérrez et al, 2016). − Southern winds play a vital role on the Uruguayan coastal dynamics, but with different effects depending on the synoptic conditions and fetch associated with wind speed (Nagy et al, 2008a;Gutiérrez et al, 2015;2016;Verocai et al, 2015). − ESE wind direction prevails up to about 7 m/s at the coast, whereas for greater speeds SW and WSW directions prevail (Panario et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

“…Besides, the understanding of these alterations is complicated by other natural long-term trend processes (e.g. El Niño Southern Oscillation -ENSO, Atlantic Multidecadal Oscillation -AMO, North Atlantic Oscillation -NAO), whose dynamics are still little known, including the effects of changes in the wave climate or sea-level rise (SLR) (Gutiérrez et al, 2015;2016;Verocai et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Relationships Between the Sand Cycle and the Behaviour of Small River Mouths: A Neglected Process / O Ciclo Da Areia E O Comportamento De Estuários De Rios Pequenos: Um Processo Negligenciado

2018

Self Cite

View full text Add to dashboard Cite

This article aims to advance in the knowledge of the relationships between the sand cycle and the behaviour of small river mouths (outlets) flowing into sandy beaches in the Río de la Plata estuary, Uruguay. The bars of these watercourses respond quickly with processes of erosion and/or migration of the channel when the "sand cycle" (coastal sedimentary balance) undergoes modifications, due to i) the effect of the fixation of dunes (sediments) by afforestation with exotic species and ii) the construction of infrastructure. Two watercourses were analysed: the Pando River and the Carrasco Creek that both have received different impacts and suffered modifications, not only in the sediment flow but also in their hydrological regime. A multitemporal analysis was based on a series of aerial photos and cartography since 1928, a background review, and the support of documents and chronicles. The data obtained were analysed statistically. Results evidence a significant loss of beach surface at the Pando River mouth, and an increase at the Carrasco Creek mouth, since the channelling of a wetland located upstream, allowing the entrance of sediments from the basin upstream of the wetland. Relevant outcomes are: i) the description and analysis of the relationships established between dune systems and the outlets of the watercourses, an aspect that has not received due attention in the scientific literature, in which the dissociation between the analysis of wind and fluvial dynamics is usual, and ii) the sedimentary balance was of both systems: erosion and accretion at the Pando and the Carrasco outlets respectively. The reconstruction of the dunes could likely prevent the escape of sand and reduce the erosion. The knowledge about human intervention and natural processes governing the interactions between sandy beaches, dunes and outlets is a crucial input to coastal management and adaptation to sea-level rise and storm surges. ResumoEste artigo tem como objetivo contribuir para o conhecimento das relações entre o ciclo de areia e o comportamento da foz de rios pequenos que desaguam em praias arenosas no estuário do Río de la Plata, no Uruguai. As barras destes cursos de água respondem rapidamente a processos de erosão e / ou migração do canal quando o "ciclo de areia" (equilíbrio sedimentar costeiro) sofre modificações, devido: i) ao efeito da fixação de dunas (sedimentos) por reflorestamento com espécies exóticas e; ii) á construção de infra-estruturas. Foram analisados dois cursos de água: os rios Pando e Carrasco, que receberam impactos diferentes e sofreram modificações, não apenas no fluxo de sedimentos, mas também no regime hidrológico. Foi efetuada a análise temporal de uma série de fotos aéreas e cartografia desde 1928, a revisão da bibliografia e utilizado suporte documental e crônicas. Os dados obtidos foram analisados estatisticamente. Os resultados evidenciam perda significativa da extensão da praia na foz do rio Pando, e um aumento da extensão na foz do rio Carrasco, desde a canalização de uma zona úmida localizada a montante, permitindo a entrada de sedimentos da bacia a montante do pantanal. Os resultados adquiridos mais relevantes foram: i) a descrição e análise das relações estabelecidas entre os sistemas dunares e os fluxos dos cursos d'água, aspecto que não tem recebido a devida atenção na literatura científica, em que a dissociação entre a análise da dinâmica eólica e fluvial é usual, e ii) o balanço sedimentar de ambos os sistemas: erosão e acreção na embocadura dos rios Pando e Carrasco, respectivamente. A reconstrução das dunas poderia evitar a perda de areia e reduzir a erosão. O conhecimento sobre intervenção humana e processos naturais que regem as interações entre praias arenosas, dunas e estuários é um conhecimento crucial para o gerenciamento costeiro e a adaptação à elevação do nível do mar e às tempestades.

show abstract

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Relationships Between the Sand Cycle and the Behaviour of Small River Mouths: A Neglected Process / O Ciclo Da Areia E O Comportamento De Estuários De Rios Pequenos: Um Processo Negligenciado

2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The direction of longshore sediment transport is from east to west at this location based on the geometry of spits that have propagated across several stream mouths (Goso, Mesa, & Alvez, 2011). Climate change may in the future alter the rate of sediment transport with a possible increase in the number and intensity of storms (Ortega, Celentano, Finkl, & Defeo, 2013;Verocai, Gómez-Erache, Nagy, & Bidegain, 2015).…”

Section: Introductionmentioning

confidence: 99%

Immature beach/dune sands along a passive continental margin: Composition, grain size and hydraulic properties of coastal sands, Parque del Plata and Las Vegas, Uruguay

Missimer

Goso

Maliva³

et al. 2019

The Depositional Record

View full text Add to dashboard Cite

The modal composition of sandstones has long been used as a tool for palaeotectonic and palaeoenvironmental analyses. Herein it is demonstrated that caution must be used when beach sand composition is utilized to assess tectonic provenances at both the local and continental scales. The occurrence of quartz arenites and compositionally mature sands along the coast of Brazil corresponds well to their passive margin location. However, modern sands from some beach locations in coastal Uruguay are less compositionally mature compared to the quartz arenites found in coastal Brazil. Along the beaches of Las Vegas and Parque del Plata, the composition of the beach and dune sands is impacted by the transport of continental outwash sediments derived from the Palaeozoic and Precambrian rocks in the interior to the beach by a low‐gradient stream, Arroyo Solis Chico, and the erosion of Pleistocene‐age formations that crop out on the beach and along an erosional scrap. The mean beach composition ratio of monocrystalline quartz to feldspar to rock fragments plus composite quartz grains is 67.5/8.0/24.5 compared to the ratio along the coast of Brazil at 86/4/10. The beach and coastal dunes environment studied is representative of about 35% of coastal Uruguay. At the smaller scale, changes in the textural properties of the beach and dune sands (grain‐size distribution and roundness) are caused by the addition of the sediment derived from erosion and stream transport. Porosity values show little influence and range between 0.35 and 0.36, but hydraulic conductivity is influenced to a greater degree, ranging from 18.5 to 31 m/day. Within one kilometre down‐drift of the river, the mean grain diameter and the mean hydraulic conductivity increase to the same values found in the up‐gradient area before influence of the sediment flux, due to the offshore transport of the finer sediment fraction during down‐gradient movement along the beach. The Arroyo Solis Chico area demonstrates that abrupt changes in composition and hydraulic properties can occur over short distances in sands deposited in passive margin environments. The potential for this local variability in sand composition and hydraulic properties should be considered in the analyses of ancient marine sandstones deposited in beach and coastal dunes environments.

show abstract

Fostering Resilience Among Artisanal Fishers in Peniche (Portugal): An Exploratory Study

Viegas

Azeiteiro

Alvés

2016

Climate Change Management

View full text Add to dashboard Cite

Addressing climate extremes in Coastal Management: The case of the Uruguayan coast of the Rio de la Plata System

Cited by 18 publications

References 24 publications

Relationships Between the Sand Cycle and the Behaviour of Small River Mouths: A Neglected Process / O Ciclo Da Areia E O Comportamento De Estuários De Rios Pequenos: Um Processo Negligenciado

Relationships Between the Sand Cycle and the Behaviour of Small River Mouths: A Neglected Process / O Ciclo Da Areia E O Comportamento De Estuários De Rios Pequenos: Um Processo Negligenciado

Immature beach/dune sands along a passive continental margin: Composition, grain size and hydraulic properties of coastal sands, Parque del Plata and Las Vegas, Uruguay

Fostering Resilience Among Artisanal Fishers in Peniche (Portugal): An Exploratory Study

Contact Info

Product

Resources

About