Coastal dunefields of south Brazil as a record of climatic changes in the South American Monsoon System

Mendes, Vinícius Ribau; Giannini, Paulo César Fonseca

doi:10.1016/j.geomorph.2015.05.034

Cited by 25 publications

(27 citation statements)

References 27 publications

(30 reference statements)

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“…This model differs substantially in emphasis from that proposed for the coastal dunes of S.E. Brazil (Mendes and Giannini, 2015) and N.E. Brazil (Tsoar et al, 2009) which tends to agree with Young et al, (1993).…”

Section: Accepted Manuscriptcontrasting

confidence: 81%

Dating the Cooloola coastal dunes of South-Eastern Queensland, Australia

et al. 2018

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The Cooloola sand dunes are part of a series of aeolian parabolic dunes that stretch along the east coast of Australia. They form a chronosequence showing increasing weathering, soil formation and water erosion across six geomorphically recognized soil landscapes. These landscapes were recognized from air photographs and further refined on the basis of some 150 auger holes across the dunes. Data about the structure and floristics of the vegetation were collected at the same time. There is a significant body of literature about the Cooloola dunes but there are two areas that have not been satisfactorily considered. First the previous dating which gave inconsistent results has been superseded by single grain OSL dates and second Cooloola has not been considered in a regional context. Here we report the results of single grain optically stimulated luminescence (OSL) analyses for 31 samples for 21 sites across the geomorphic landscapes. The sites were selected near the apex of each dune as this represents the last depositional date and the least disturbed by sand movement.

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Section: Accepted Manuscriptcontrasting

confidence: 81%

Dating the Cooloola coastal dunes of South-Eastern Queensland, Australia

et al. 2018

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“…The second reason, connected to the stabilization of the aeolian dunes, would be a possible reduction of wind intensity with rain increase. Similar effect is observed in the recent stabilization of the central coastal dunes of Santa Catarina (Miot da Silva & Hesp 2013, Mendes & Giannini 2015 and medium north of Rio Grande do Sul (Martinho et al 2010). Weather data from the last century points to the rise of the annual precipitation associated with a decrease of the wind intensity as the main control factor of stabilization observed on the dunefields of the Santa Catarina coast.…”

supporting

confidence: 74%

“…G4 appears surrounded almost exclusively by G3 and suffers a stabilization process by vegetation growth in the deflation zone, and by the consequent reduction of sedimentary supply for the more distal wind features, such as depositional frontal lobes and precipitation ridges (Mendes & Giannini 2015). …”

Section: Distribution Of the Quaternary Sedimentary Unitsmentioning

confidence: 99%

“…Weather data from the last century points to the rise of the annual precipitation associated with a decrease of the wind intensity as the main control factor of stabilization observed on the dunefields of the Santa Catarina coast. In this context, the dune stabilization would be supported by the combined effects of: 1. the vegetation grown and/or development of wetlands on the deflation zones; 2. the increase of the transportation threshold due to the sand cohesion induced by the moisture increase; and 3. the decrease of the wind intensity (Mendes & Giannini 2015). Figure 10.…”

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confidence: 94%

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Central Santa Catarina coastal dunefields chronology and their relation to relative sea level and climatic changes

et al. 2015

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During the past decades, there have been contrarian explanations for the formation and stabilization of coastal dunefields: while many authors believe the dunes formation would be enhanced by falling sea level, others argue that a rising or stable sea level context would be favorable. For Brazilian coastal dunefields, the second hypothesis seems to be more consistent with the luminescence ages found so far; however, most of these data were obtained without using the SAR protocol. Another point of concern is the role of climate change in the aeolian system, which is still not very clear. The aim of this paper is to try to clarify these two questions. To this end, five coastal dunefields were selected in central Santa Catarina coast. The remote sensing and dating results allowed the discrimination and mapping of at least four aeolian generations. Their age distribution in relation to the global curve of relative sea level variation during the Late Pleistocene allows us to suggest that the formation of Aeolian dunefields in the coastal context is supported by stable relative sea level. However, relative sea level is not the only determinant for the formation and preservation of the aeolian coastal dunes. Evidences of climatic control indicate that the initiation of dunefields would be favored by periods of less humidity while their stabilization would occur preferably during the periods of rain intensification, connected to monsoon activity.KEYWORDS: OSL-SAR dating; Dune stabilization; Aeolian generations. RESUMO: A formação e estabilização de campos de dunas costeiros têm sido explicadas de maneiras contrárias ao longo das últimas déca-das: enquanto alguns autores acreditam que a formação das dunas seria favorecida pelo nível do mar descendente, outros autores defendem que o contexto de nível do mar estável seria mais favorável à sua formação. No caso dos campos de dunas costeiros do Brasil, a segunda hipótese parece ser mais consistente com as idades de luminescência obtidas até o momento; no entanto, a maior parte desses dados foi obtida sem o uso do protocolo SAR (Single Aliquot Regenerative dose

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“…Specifically, Durán Vinent and Moore (2013) note that stronger vegetative forcing results in more linear, stable dunes, while sparse vegetation creates transgressive dunefields, or in some cases, sand sheets (Kasse, 1997;Pile et al, 2019). Intriguingly, Mendes and Giannini (2015), studying the same section of the Santa Catarina coast as Rodrigues et al (2020), posit that stabilization of dunes is tied to coincident increases in precipitation and decreases in windiness, which also suggests an inverse relationship between vegetation growth and QD in natural systems. This relationship may enhance the morphological impacts of the inverse relationship between Q S https://doi.org/10.5194/esurf-2020-88 Preprint.…”

Section: Dune-dominated Transgressionmentioning

confidence: 99%

Quantifying Thresholds of Barrier Geomorphic Change in a Cross-Shore Sediment Partitioning Model

Ciarletta¹,

Miselis²,

Shawler³

et al. 2020

Preprint

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Abstract. Barrier coasts, including barrier islands, beach-ridge plains, and associated landforms, can assume a broad spectrum of morphologies over decadal scales that reflect conditions of sediment availability, accommodation, and relative sea-level rise. However, the quantitative thresholds of these controls on barrier-system behavior remain largely unexplored, even as modern sea-level rise and anthropogenic modification of sediment availability increasingly reshape the world’s sandy coastlines. In this study, we conceptualize barrier coasts as sediment partitioning frameworks, distributing sand delivered from the shoreface to the subaqueous and subaerial components of the coastal system. Using an idealized morphodynamic model, we explore thresholds of behavioral/morphologic change over decadal to centennial timescales, simulating barrier evolution within quasi-stratigraphic morphological cross-sections. Our results indicate a wide diversity of barrier behaviors can be explained by the balance of fluxes delivered to the beach versus the dune/backbarrier, including previously understudied forms of transgression that allow the subaerial system to continue accumulating sediment during landward migration. Most importantly, our results show that barrier state transitions between progradation, cross-shore amalgamation, aggradation, and transgression are controlled largely through balances within a narrow range of relative sea-level rise and sediment flux. This suggests that, in the face of rising sea levels, subtle changes in sediment fluxes could result in significant changes in barrier morphology. We also demonstrate that modeled barriers with reduced vertical sediment accommodation are highly sensitive to the magnitude and direction of shoreface fluxes. Therefore, natural barriers with limited sediment accommodation could allow for exploration of the future effects of sea-level rise and changing flux magnitudes over a period of years as opposed to the decades required for similar responses in sediment-rich barrier systems. Finally, because our model creates stratigraphy generated under different input parameters, we propose it could be used in combination with stratigraphic data to hindcast the sensitivity of existing barriers and infer changes in pre-historic morphology, which we anticipate will provide a baseline to assess the reliability of forward modeling predictions.

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Coastal dunefields of south Brazil as a record of climatic changes in the South American Monsoon System

Cited by 25 publications

References 27 publications

Dating the Cooloola coastal dunes of South-Eastern Queensland, Australia

Dating the Cooloola coastal dunes of South-Eastern Queensland, Australia

Central Santa Catarina coastal dunefields chronology and their relation to relative sea level and climatic changes

Quantifying Thresholds of Barrier Geomorphic Change in a Cross-Shore Sediment Partitioning Model

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