Geomorphic and temporal evolution of a Mississippi delta flanking barrier island: Grand Isle, LA

Torres, Julie; Kulp, Mark A.; FitzGerald, Duncan M.; Georgiou, Ioannis Y.; Lepper, Kenneth

doi:10.1016/j.margeo.2020.106341

Cited by 10 publications

(7 citation statements)

References 66 publications

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“…This behaviour was observed primarily along the north side of Grand Isle and in southern Caminada Bay and could be a driver for the high degree of overlap between the western and island social clusters. Grand Isle began forming around 750 years ago and is one of the most stable Louisiana barrier islands (Torres et al, 2020). Perhaps dolphins from different clusters have shifted their core usage area towards Grand Isle, a preferred area for the ‘drilling’ foraging strategy.…”

Section: Discussionmentioning

confidence: 99%

Fine‐scale social and genetic structure of common bottlenose dolphins (Tursiops truncatus) in the Barataria Basin, Louisiana, USA

Speakman

Wilcox

Balmer

et al. 2022

Aquatic Conservation

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Section: Discussionmentioning

confidence: 99%

Fine‐scale social and genetic structure of common bottlenose dolphins (Tursiops truncatus) in the Barataria Basin, Louisiana, USA

Speakman

Wilcox

Balmer

et al. 2022

Aquatic Conservation

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“…Sets of beach ridges were defined following the criteria used by Torres et al (2020), including the truncation relationships with older beach ridges, angular contacts, and flat topographies representing the absence of ridges and depressions. Delineation of sets was also based on previous research in the area.…”

Section: Methods and Assumptionsmentioning

confidence: 99%

“…Deltaic strandplains are the most complex with high number of sets and ridges within sets (Figure 10a). Unconformities associated with set boundaries are representative of erosional and re‐configuration phases of the delta plain have been attributed to changes in rates of relative sea‐level rise/fall (Torres et al, 2020), fluvial discharges (Milli et al, 2013), longshore transport (including reversals widely documented in Brazilian delta plains; Andrade et al, 2003) and even to human activity (Goodfriend & Stanley, 1999; Stănică & Panin, 2009). The lower number of sets in non‐deltaic strandplains might be related to two main aspects: (i) the absence of major rivers become more stable the balance between sediment supply and accommodation; (ii) the embayed geometry, commonly bordered by bedrock headlands shelters the shoreline from the action of waves and storms.…”

Section: Linking Morphometric Attributes To Depositional Processes An...mentioning

confidence: 99%

“…Spacing between ridges in strandplains is commonly interpreted as a function of progradation rates (Thompson & Baedke, 1997; Torres et al, 2020); closely spaced ridges indicate higher rates of progradation, whereas greater spacing related to lower rates (Lampe & Lampe, 2018; Taylor & Stone, 1996). In that sense, most of the beach‐ridge systems in this study, independently from the type of coastal setting, have been subject to a reduction in progradation rates, which probably relates to a global relative sea‐level rise.…”

Section: Linking Morphometric Attributes To Depositional Processes An...mentioning

confidence: 99%

Section: Beach-ridge Setsmentioning

confidence: 99%

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Contrasting beach‐ridge systems in different types of coastal settings

Isla

Moyano‐Paz

FitzGerald

et al. 2022

Earth Surf Processes Landf

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Beach-ridge systems are geomorphological features common in every type of coast and have been widely interpreted as geo-archives of past sea-level, climatic, or tectonic changes. These relict morphological elements are well-known by their facies, architecture, stratigraphy, and evolution. However, the coastal context where beach ridges are formed has never been evaluated. Coastal beach-ridge systems were classified into four main types corresponding to deltaic strandplains, non-deltaic strandplains, spits, and barrier islands. Our study consisted of three scales of analysis:(1) the entire beach-ridge system; (2) beach-ridge sets; and (3) individual beach ridges.Several beach-ridge systems having formed in different types of coastal settings are compared by their present characteristics. Geomorphic data generated from processing and interpreting satellite images combined with previous studies are used to quantify multi-scale attributes of beach-ridge systems. These attributes include the area, length, width, number of sets, number of ridges per set, set rotation, ridge spacing, and ridge elevation. Our findings demonstrate that significant differences define beach-ridge systems including deltaic strandplains, large non-deltaic strandplains, small non-deltaic strandplains, large spits (cuspate forelands), small spits (flying spits, bay-mouth spits and tombolos) and barrier islands. A more comprehensive characterization of the factors controlling beach-ridge variability will improve our ability to recognize the sedimentary record of ancient of these systems. The proposed basic platform can be used to isolated different beach-ridge types and systems to facilitate future process and morphodynamic studies.

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Morphological evolution of a complex drift‐aligned prograded barrier

Carvalho,

Mueller,

Reef

2023

Earth Surf Processes Landf

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Prograded barriers are coastal landforms with a worldwide distribution that provide a paleoenvironmental record within a sequence of successive ridges and intervening swales. Most barriers with variable terrestrial morphologies, also known as complex barriers, have been poorly studied. At the main entrance of Western Port, a bay in southeastern Australia, a morphologically complex barrier was formed as a function of its somewhat sheltered position and orientation in relation to sporadic swells and tidal circulation. LiDAR‐derived topography shows highly truncated and asymmetrical ridges both across and along the Somers–Sandy Point barrier plain. These uncommon morphologies are associated with an intricate hydrodynamic circulation subject to sporadic storms approaching at a sharp angle to the shoreline that eliminate a significant part of the sedimentary record but also redistribute vast quantities of sand to the downdrift shoreline, and a large and variable sandy bank that undergoes intense sediment movement. Optically stimulated luminescence (OSL) dating within a limited area on the western side revealed an age of ~2600 years for the innermost dated ridge, located about halfway across the plain. Significant erosion of the ridges' record occurred on the western side of the barrier between 2600 and 700 years ago and between 600 and 240 years ago, whereas undated ridges on the eastern side were preserved. This creates an opportunity for future research on past erosional events that would be of great value for coastal management and adaptation. Textural and elemental (XRF) sediment characteristics suggest that the type of material provided for barrier accretion remained the same throughout the late Holocene. Given the sustained growth of the barrier and other sandy parts of the bay, a net supply of marine sand from Bass Strait must have occurred. The proposed evolutionary model contributes to the understanding of the sediment budget for the bay as a whole.

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Geomorphic and temporal evolution of a Mississippi delta flanking barrier island: Grand Isle, LA

Cited by 10 publications

References 66 publications

Fine‐scale social and genetic structure of common bottlenose dolphins (Tursiops truncatus) in the Barataria Basin, Louisiana, USA

Fine‐scale social and genetic structure of common bottlenose dolphins (Tursiops truncatus) in the Barataria Basin, Louisiana, USA

Contrasting beach‐ridge systems in different types of coastal settings

Morphological evolution of a complex drift‐aligned prograded barrier

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