Storm-induced sediment supply  to coastal dunes on sand flats

Silva, Filipe Galiforni; Wijnberg, Kathelijne Mariken; Hulscher, Suzanne J.M.H.

doi:10.5194/esurf-8-335-2020

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…Nevertheless, the luminescence ages of ~82 ka in the aeolian sediments overlying marine and backshore deposits at AC-01 (Fig. 6, Table 2) and ~85 ka in the northern CPRS (Poupeau et al, 1988) seem consistent with increased onshore sand supply available for aeolian redistribution triggered by an MIS 5a sea-level rise (Porat and Botha, 2008; Bateman et al, 2011; Tamura et al, 2011; Galiforni-Silva et al, 2020).…”

Section: Discussionmentioning

confidence: 80%

Stratigraphy and evolution of the late Pleistocene (MIS 5) coastal Barrier III in southern Brazil

Lopes,

Pereira,

Caron

et al. 2024

Quat. res.

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The structure and origin of the Pleistocene (Marine Isotope Stage [MIS] 5) coastal Barrier III in southern Brazil were investigated through analysis of lithofacies, numerical ages, and ground-penetrating radar (GPR) data obtained in outcrops and subsurface deposits. The stratigraphic succession is characteristic of transgressive barriers, with muddy lagoon bottom facies unconformably overlying an older unit (Barrier II) and overlain by landward-dipping lagoon margin and aeolian facies. The back-barrier lagoon was filled with sediments and shells transferred from the foreshore through overwash and/or inlets during the MIS 5e transgressive-high-stand phase, with a higher sea level that reached about +6 to +7 m relative to the present. Marine sediments and shells on the seaward side of the barrier dated to ~100–106 ka indicate another high stand at +4 to +5.1 m during MIS 5c. One shell dated to ~87 ka and aeolian deposits dated to ~82 and ~85 ka suggest a third high stand during MIS 5a that reached at least −2 m relative to the present. The two (possibly three) juxtaposed marine deposits show that Barrier III is a more complex unit than previously recognized, built by successive orbitally forced eustatic sea-level oscillations also recorded in other deposits along the Brazilian coast and worldwide.

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Section: Discussionmentioning

confidence: 80%

Stratigraphy and evolution of the late Pleistocene (MIS 5) coastal Barrier III in southern Brazil

Lopes,

Pereira,

Caron

et al. 2024

Quat. res.

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“…Our idealized tidal basin only developed higher intertidal area ( z b > 0.5 m) for very low τ e . The limited development of the higher intertidal area is probably a result of the sheltered environment with limited waves along the borders of the basin, the absence of extreme storms and surges and the oversimplification of the tidal signal (de Vet et al., 2018; Galiforni‐Silva et al., 2020; Schrijvershof et al., 2023).…”

Section: Resultsmentioning

confidence: 99%

Morphodynamic Modeling of Tidal Basins: The Role of Sand‐Mud Interaction

Colina Alonso,

van Maren,

van Weerdenburg

et al. 2023

JGR Earth Surface

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The morphology of tide‐dominated systems is progressively influenced by human activities and climate change. Quantitative approaches aiming at understanding or forecasting the effects of interventions and climate change are often aggregated, thereby simplifying or schematizing the investigated area. In this work, we advance on the knowledge of sediment transport processes shaping tidal systems and on methodologies translating schematized model output into physically realistic variables. In terms of improved physics, we systematically evaluate the influence of sand‐mud interaction processes. Most tidal systems are shaped by a mixture of sand and mud. Morphological models typically compute transport of sand and mud independently, despite studies clearly demonstrating that their physical behavior is mutually dependent. We investigate the effects of two interaction mechanisms (erosion interaction and roughness interaction, applied with varying mud erodibility) with a schematized process‐based morphodynamic model. We convert model output into metrics that describe the meso‐scale configuration of the modeled systems, allowing a quantitative comparison of scenarios. Modeled patterns and intertidal flat shape, size and composition widely vary with mud erodibility settings, but equally depend on the evaluated sand‐mud interaction mechanisms (with erosion interaction having a larger effect than roughness interaction). Sand‐mud interaction thus needs to be accounted for from a physical point of view, but also to improve predictions of tidal basin evolution models, particularly the (bimodally distributed) sediment composition of intertidal flats.

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“…Over the sand flat, dunes tended to be larger in the more wave-exposed zone than in the more sheltered region due to spatial variations in supply conditions. Although the authors argue that groundwater level can induce such spatial variability on sand supply, other conditions such as inundation frequency [30] and storm-induced sand deposition [31,32] may also contribute to supply variability.…”

Section: Introductionmentioning

confidence: 99%

On the Relation between Beach-Dune Dynamics and Shoal Attachment Processes: A Case Study in Terschelling (NL)

Silva

Wijnberg

Hulscher

2020

JMSE

Self Cite

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Inlet-driven processes are capable of modifying the adjacent shoreline. However, few studies have attempted to understand how these changes affect coastal dunes. The present study aims to understand how shoreline changes induced by shoal attachment affect coastal dunes. A barrier island in the Netherlands is used as a case study. Both bathymetric and topographic annual data were analysed, together with the application of a cellular automata model for dune development. The objective of the model is to explore idealised scenarios of inlet-driven shoreline movements. With the model, ten different scenarios were examined regarding beach width increase and rate of alongshore spreading of the shoal. Field data showed that, for the case study, dune volume and shoal attachments could not be directly linked. Instead, rates of dune volume change differed significantly only due to long-term ebb-tidal delta evolution. Such morphological evolution oriented the beach towards the main wind direction, increasing overall aeolian transport potential. Modelling results showed that shoals significantly increased dune volumes only on three out of ten scenarios. This suggests that beach width increase, and rate of alongshore sediment spreading, determine whether the shoal will influence dune growth. Therefore, within the studied time-scale, local rates of dune growth are only increased if shoals are capable of increasing the beach width significantly and persistently.

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Storm-induced sediment supply to coastal dunes on sand flats

Cited by 7 publications

References 44 publications

Stratigraphy and evolution of the late Pleistocene (MIS 5) coastal Barrier III in southern Brazil

Stratigraphy and evolution of the late Pleistocene (MIS 5) coastal Barrier III in southern Brazil

Morphodynamic Modeling of Tidal Basins: The Role of Sand‐Mud Interaction

On the Relation between Beach-Dune Dynamics and Shoal Attachment Processes: A Case Study in Terschelling (NL)

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