Atlantic shelf sand ridge study : physical oceanography and sediment dynamics data report

Dragos, Paul; Aubrey, David G.

doi:10.1575/1912/1003

Cited by 4 publications

(8 citation statements)

References 12 publications

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“…........ e ..... ....... ' ........ ' ' ß ........ : ......... ' ' ' ........ : ..... puted from (28) indicate offshore flow at ridge crests and onshore flow at ridge troughs, as expected (Figure 9, right). The maximum streamline distortion is roughly 10 ø , which is crudely consistent with observations of enhanced offshore veering over ridge crests during southerly wind-driven flows [Dragos and Aubrey, 1990] (see Figure 10).…”

Section: Physics Of the Instabilitymentioning

confidence: 99%

A mechanism for the formation and maintenance of shore‐oblique sand ridges on storm‐dominated shelves

Trowbridge¹

1995

J. Geophys. Res.

107

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A remarkable set of shore‐oblique sand ridges occupies the inner portion of the storm‐dominated Middle Atlantic and South Atlantic Bights, off the east coast of the United States of America. A mechanism for present‐day formation and growth of these distinctive geological features follows from a linearized analysis of the stability of alongshore‐periodic topographical perturbations, based on a depth‐averaged fluid dynamical model with a simple representation of sediment transport. The analysis indicates exponential growth of shore‐oblique features as a result of offshore deflection of storm‐driven alongshore flows at ridge crests, which leads to a convergence of sediment flux because the effective carrying capacity decreases with increasing distance offshore. The analysis indicates a set of conditions required for ridge growth. Model solutions for topography under conditions favorable for ridge growth are strikingly similar to the observed sand ridges.

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Section: Physics Of the Instabilitymentioning

confidence: 99%

A mechanism for the formation and maintenance of shore‐oblique sand ridges on storm‐dominated shelves

Trowbridge¹

1995

J. Geophys. Res.

107

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“…Fire Island's SFCRs are well-sorted with medium-fine grained sand, and have an average amplitude of approximately 8m and spacing of 3km (Warner et al 2014). SFCRs have been recognized globally, but their form varies between tidal and storm dominated shelves, Long Island being storm-dominated (Dragos et al 1990, Lavelle et al 1978. 259 SFCRs have been identified along the US Atlantic Coast (McBride and Moslow 1991).…”

Section: Geologic Setting Of Long Island Ny and Sfcrsmentioning

confidence: 99%

“…The dynamics in this region are dominated by the forcing of alongshore wind stress and alongshore pressure gradients, balanced by bottom stress response (Pettigrew 1980, Lentz and Winant 1986, Lentz 1994, Liu and Weisberg 2005, Gutierrez et al 2006, Fewings and Lentz 2010, Lentz and Fewings 2012. Coastal and bathymetric variations modify inner shelf circulation and the momentum balance (Dragos andAubrey 1990, Yankovsky andGarvine 1998, van de Meene and van Rijn 2000a, Kirincich andBarth 2009, Kumar et al 2013).…”

Section: Chapter 1: Introductionmentioning

confidence: 99%

Alongshore momentum balance over shoreface-connected ridges, Fire Island, NY,

Ofsthun

Voulgaris

et al. 2019

Continental Shelf Research

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Bathymetric variations, such as shoreface-connected ridges (SFCRs), modify inner shelf circulation, altering the significance of and relationships between alongshore momentum balance terms. The inner shelf of Fire Island, NY provides a study site representative of SFCRs around the world. During the winter of 2014, hydrodynamic observations (~12 m depth) from 6 ADCPs, 3 SeaGauge pressure sensors, 2 tide gauges, and 2 meteorological buoys were collected over a region of the inner shelf spanning a full wavelength of one such SFCR. Analysis of the data, under westward wind forcing, revealed a predominantly alongshore circulation with localized offshore (onshore) current veering over the SFCR crests (troughs). This circulation pattern, and its implied sediment dynamics, has long been recognized as the primary maintenance mechanism for SFCRs. Momentum balance analysis revealed local acceleration, advective acceleration, and bottom stress to be balanced by wind stress and large-scale (>100 km) pressure gradient force (correlation r=0.75). Current veering of alongshore flows is hypothesized to result from a frictional torque-induced rotation stemming from bottom stress variations across

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“…Fire Island's SFCRs are well-sorted with medium-fine grained sand, and have an average amplitude of approximately 8m and spacing of 3km . SFCRs have been recognized globally, but their form varies between tidal and storm dominated shelves, Long Island being storm-dominated (Dragos et al 1990, Lavelle et al 1978 Island to the west. An offshore sediment source has been hypothesized to close this gap, though the forcing has not been recognized (Rosati et al 1999, Hapke et al 2010).…”

Section: Geologic Setting Of Long Island Ny and Sfcrsmentioning

confidence: 99%

“…The dynamics in this region are dominated by the forcing of alongshore wind stress and alongshore pressure gradients, balanced by bottom stress response (Pettigrew 1980, Lentz and Winant 1986, Lentz 1994, Liu and Weisberg 2005, Gutierrez et al 2006, Fewings and Lentz 2010, Lentz and Fewings 2012. Coastal and bathymetric variations modify inner shelf circulation and the momentum balance (Dragos and Aubrey 1990, Yankovsky and Garvine 1998, van de Meene and van Rijn 2000a, Kirincich and Barth 2009, Kumar et al 2013). …”

Section: Chapter 1: Introductionmentioning

confidence: 99%

Alongshore Momentum Balance Over Shoreface-Connected Ridges, Fire Island, Ny

Ofsthun¹

2016

Geological Society of America Abstracts With Programs

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Bathymetric variations, such as shoreface-connected ridges (SFCRs), modify inner shelf circulation, altering the significance of and relationships between alongshore momentum balance terms. The inner shelf of Fire Island, NY provides a study site representative of SFCRs around the world. During the winter of 2014, hydrodynamic observations (~12 m depth) from 6 ADCPs, 3 SeaGauge pressure sensors, 2 tide gauges, and 2 meteorological buoys were collected over a region of the inner shelf spanning a full wavelength of one such SFCR. Analysis of the data, under westward wind forcing, revealed a predominantly alongshore circulation with localized offshore (onshore) current veering over the SFCR crests (troughs). This circulation pattern, and its implied sediment dynamics, has long been recognized as the primary maintenance mechanism for SFCRs.Momentum balance analysis revealed local acceleration, advective acceleration, and bottom stress to be balanced by wind stress and large-scale (>100 km) pressure gradient force (correlation r=0.75). Current veering of alongshore flows is hypothesized to result from a frictional torque-induced rotation stemming from bottom stress variations across SFCRs.

show abstract

Atlantic shelf sand ridge study : physical oceanography and sediment dynamics data report

Cited by 4 publications

References 12 publications

A mechanism for the formation and maintenance of shore‐oblique sand ridges on storm‐dominated shelves

A mechanism for the formation and maintenance of shore‐oblique sand ridges on storm‐dominated shelves

Alongshore momentum balance over shoreface-connected ridges, Fire Island, NY,

Alongshore Momentum Balance Over Shoreface-Connected Ridges, Fire Island, Ny

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