Sediment supply from shoreface to dunes: linking sediment transport measurements and long-term morphological evolution

Aagaard, Troels; Davidson‐Arnott, Robin; Greenwood, Brian; Nielsen, Jørgen G.

doi:10.1016/j.geomorph.2003.08.002

Cited by 232 publications

(166 citation statements)

References 32 publications

(37 reference statements)

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“…This information has been used to link observations with what is known about localized sediment supply and geology of a system (e.g. Aagaard et al, 2004;Houser et al, 2008;Lentz et al, 2013;Schwab et al, 2013;Warner et al, 2014;Hapke et al, 2016), providing better understanding of the signature these controls may exert on an area.…”

Section: Introductionmentioning

confidence: 99%

Characterizing storm response and recovery using the beach change envelope: Fire Island, New York

et al. 2018

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Hurricane Sandy at Fire Island, New York presented unique challenges in the quantification of storm impacts using traditional metrics of coastal change, wherein measured changes (shoreline, dune crest, and volume change) did not fully reflect the substantial changes in sediment redistribution following the storm. We used a time series of beach profile data at Fire Island, New York to define a new contour-based morphologic change metric, the Beach Change Envelope (BCE). The BCE quantifies changes to the upper portion of the beach likely to sustain measurable impacts from storm waves and capture a variety of storm and post-storm beach states. We evaluated the ability of the BCE to characterize cycles of beach change by relating it to a conceptual beach recovery regime, and demonstrated that BCE width and BCE height from the profile time series correlate well with established stages of recovery. We also investigated additional applications of this metric to capture impacts from storms and human modification by applying it to several post-storm historical datasets in which impacts varied considerably; Nor'Ida (2009), Hurricane Irene (2011), Hurricane Sandy (2012), and a 2009 community replenishment. In each case, the BCE captured distinctive upper beach morphologic change characteristic of these different beach building and erosional events. Analysis of the beach state at multiple profile locations showed spatial trends in recovery consistent with recent morphologic island evolution, which other studies have linked with sediment availability and the geologic framework. Ultimately we demonstrate a new way of more effectively characterizing beach response and recovery cycles to evaluate change along sandy coasts.Published by Elsevier B.V.

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Section: Introductionmentioning

confidence: 99%

Characterizing storm response and recovery using the beach change envelope: Fire Island, New York

et al. 2018

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“…It is likely the dune peak formation is associated with stabilization and vegetation colonization; however, it is a 'chicken-and-egg' problem whether the subsequent deflation of the peak is a result of embryo dune building and, therefore, a lack of sediment in the foredunes, or whether it is the onset of erosion creating embryo dunes out of sediment derived from the dune peak. A similar problem was encountered on the Danish North coast where it could not be determined whether steepening of a shoreface was a result of onshore bar migration and landward sediment transfers, or whether onshore bar migration had been caused by an increasing shoreface slope [12]. Since migration processes acting on dynamic dune systems are determined by wind direction relative to dune alignment [13], it would seem more likely that deflation and accretion of the dune peak is the outcome of at least two, asymmetric, erosive wind directions, one of which is more dominant and effective, creating a slip face on the lee side of the peak.…”

Section: Discussionmentioning

confidence: 95%

Morphodynamics of the Morfa Dyffryn coastal dunes, mid-Wales: photographic survey 1988–2007

Millington

Fullen

Moore

et al. 2008

WIT Transactions on the Built Environment

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In this 20-year case study on the Morfa Dyffryn dunes, Gwynedd, mid-Wales (National Grid Reference: SH563240), straightforward and inexpensive photography, from fixed points and angles, proved useful for monitoring the evolution and migration of dynamic dune landforms. The mobile foredunes are particularly dynamic with cyclical morphological development paralleling an overall landward recession, evident by exposure of a World War II bunker in 1995. A cyclical trend is documented through photosets. The dune meadow has undergone cyclical patterns of sand encroachment, followed by stabilization by vegetation, while the fixed hind dunes remain stable. A general relationship between foredune morphology and erosion/accretion processes has been established, offering the prospect of predicting future dune morphological changes.

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“…However, it is a 'chicken-and-egg' problem whether the subsequent deflation of the peak is a result of embryo dune building and, therefore, a lack of sediment in the foredunes, or whether it is the onset of erosion creating embryo dunes out of sediment derived from the dune peak. A similar problem was encountered on the north coast of Denmark, where it could not be determined whether steepening of a shoreface was a result of onshore bar migration and landward sediment transfers, or whether onshore bar migration had been caused by an increasing shoreface slope (Aagaard et al 2004). Since migration processes acting on dynamic dune systems are determined by wind direction relative to dune alignment (Tsoar et al 2004), it would seem more likely that deflation and accretion of the dune peak is the outcome of at least two, asymmetric, erosive wind directions, one of which is more dominant and effective, creating a slip face on the lee side of the peak.…”

Section: Dune Dynamicsmentioning

confidence: 96%

Interactions Between Local People and Lakes: An Example From Turkey/Gyvenvietės Ežerų Apylinkėse. Naudojimasis Ir Jiems Daroma Žala (Turkijos Pavyzdys)/Приозерные Поселения. Использование Озер И Наносимый Им Вред (На Примере Tурции)

Millington

Booth

Fullen

et al. 2009

Journal of Environmental Engineering and Landscape Management

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Abstract. Attitudes to maintaining dune diversity are changing under the realization that existing dune stabilization techniques are fixing dune landscapes, causing 'coastal squeeze' and loss of habitat as shorelines retreat. Instead, it is recommended that a natural, dynamic, migrating dune system is much more appropriate and that blown, unstable sands are encouraged to act as mobile coastal defence barriers. Lack of appropriate monitoring techniques has limited progress in understanding the role of sediment dynamics in dune environments over long timescales. Therefore, this paper outlines the role of straightforward and inexpensive photography, from fixed points and angles, as a useful approach to long-term, decadal monitoring of the evolution and migration of dynamic dune landforms. The case study, on the Morfa Dyffryn dunes, Gwynedd, mid-Wales, United Kingdom (National Grid Reference SH563240), identified particularly dynamic mobile foredunes, with cyclical morphological development, paralleling to an overall landward recession. A cyclical trend of sand encroachment, followed by stabilization with growing vegetation, is documented for semi-fixed dune pastures, while the hind dunes remained stable. A general relationship between foredune morphology and erosion/accretion processes was established, offering the prospect of predicting future dune morphological changes in other dune systems, if increased blown sand activity is encouraged as a management technique.

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Sediment supply from shoreface to dunes: linking sediment transport measurements and long-term morphological evolution

Cited by 232 publications

References 32 publications

Characterizing storm response and recovery using the beach change envelope: Fire Island, New York

Characterizing storm response and recovery using the beach change envelope: Fire Island, New York

Morphodynamics of the Morfa Dyffryn coastal dunes, mid-Wales: photographic survey 1988–2007

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