Migration of parabolic dunes at Aberffraw, Anglesey, north Wales

Bailey, S.D.; Bristow, Charlie S.

doi:10.1016/j.geomorph.2003.09.013

Cited by 75 publications

(47 citation statements)

References 6 publications

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“…The migration rate was calculated as this distance divided by the time span (m a −1 ). The mean migration rates of these four points were treated as the mean migration rate of each barchan dune [17,[20][21][22][23][24][25].…”

Section: Dune Migrationmentioning

confidence: 99%

Migration and Morphology of Asymmetric Barchans in the Central Hexi Corridor of Northwest China

Zhang

Dong

et al. 2018

Geosciences

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Crescent-shaped barchan dunes often display an asymmetric shape, with one limb longer than the other. As shown in previous studies, asymmetric bimodal winds constitute one major cause of barchan asymmetry, but the heterogeneous conditions of sand availability or flux, as well as topographic influences, may be also important. Understanding the morphology and dynamics of asymmetric barchans may have an impact in a broad range of areas, particularly as these dunes may serve as a proxy for planetary wind regimes and soil conditions in extraterrestrial environments. However, in addition to the existing theories and numerical models that explain barchan asymmetry, direct measurements of migration rates and morphologic changes of real asymmetric barchans over a time span of several years would be beneficial. Therefore, here we report such measurements, which we have acquired by investigating asymmetric barchans in the Hexi Corridor, northwest of China. We have found that dune interactions and asymmetric influx conditions are the most important causes of barchan asymmetry in this field. Particle size distributions in the Hexi Corridor display strong variations over different parts of the asymmetric barchans, as well as over different dunes, with gravel particles being incorporated from the substrate as the dunes migrate. Our observations have shown that upwind sediment sources are important for dune formation in the Hexi Corridor, and that interdune interactions affect dune shape in different ways, depending on their offset. The asymmetric barchans in the Hexi Corridor are active, with an average migration rate (MR) between 8 and 53 m year −1 , in spite of the different asymmetric shapes. Our data for dune migration rates can be described well by a scaling of MR = A/(W + W0), where W is the barchan cross-wind width, A ≈ 2835 m 2 s −1 , and W0 ≈ 44 m. A similar scaling fits very well the migration rate as a function of dune along-wind width L, (i.e., MR = B/(L + L0), with B ≈ 1722 m 2 s −1 and L0 ≈ 13 m). Linear relations are also found between both dune widths and the average limb and windward side lengths, thus indicating that the morphometric relations that are predicted from models for steady-state, symmetric crescent-shaped dunes can be applied to different transitional morphologies of interacting, asymmetric barchans.

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Section: Dune Migrationmentioning

confidence: 99%

Migration and Morphology of Asymmetric Barchans in the Central Hexi Corridor of Northwest China

Zhang

Dong

et al. 2018

Geosciences

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“…The most widely used method involves measuring the distance between two lines representing successive positions of the dune (Gay, 1999) (also termed as "nose to nose", by Bailey and Bristow, 2004). Typically the edges of slipfaces, brink lines, or cuspate vegetation marks are used to represent the position of the dune (Jimenez et al, 1999;Levin et al, 2009).…”

Section: Dune Form Movementmentioning

confidence: 99%

“…This method avoids some of the subjectivity of drawing lines and results in improved measurements of dune movement ). The linear method was suggested by Bailey and Bristow (2004) to study the migration of the coastal parabolic dunes at Aberffraw, North Wales. They suggested fitting a best-fit linear trend line to the data points forming the polylines representing the dunes ridge positions.…”

Section: Dune Form Movementmentioning

confidence: 99%

Remote sensing and spatial analysis of aeolian sand dunes: A review and outlook

Hugenholtz

Levin

Barchyn

et al. 2012

Earth-Science Reviews

177

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“…, with a mean migration rate of 1 m year -1 (Bailey and Bristow 2004). However, these migration rates are low compared with the parabolic dunefield of Newborough Warren, Anglesey, where migration rates of 1.5-6.7 m year -1 over a 3-year period were determined (Ranwell 1958).…”

Section: Case Study Areamentioning

confidence: 99%

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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Migration of parabolic dunes at Aberffraw, Anglesey, north Wales

Cited by 75 publications

References 6 publications

Migration and Morphology of Asymmetric Barchans in the Central Hexi Corridor of Northwest China

Migration and Morphology of Asymmetric Barchans in the Central Hexi Corridor of Northwest China

Remote sensing and spatial analysis of aeolian sand dunes: A review and outlook

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