Beach ridges — definitions and significance

Otvos, Ervin G.

doi:10.1016/s0169-555x(99)00075-6

Cited by 406 publications

(291 citation statements)

References 31 publications

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“…The ridges lack a vertical facies differentiation from above to below into dune, foreshore and upper shoreface, which was reported from several other sites both in a lacustrine and marine setting (e.g. Thompson, 1992;Taylor and Stone, 1996;Otvos, 2000;Baedke et al, 2004). Furthermore, the number of higher ridges per site at LFS is small (n = 1-2), probably reflecting a rather short, (storm?-) event-like record.…”

Section: Section Fuer12 (Rampart Of a Drainage Ditch)supporting

confidence: 52%

Littoral landforms and pedosedimentary sequences indicating late Holocene lake-level changes in northern central Europe — A case study from northeastern Germany

Kaiser¹,

Küster²,

Fülling³

et al. 2014

Geomorphology

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Section: Section Fuer12 (Rampart Of a Drainage Ditch)supporting

confidence: 52%

Littoral landforms and pedosedimentary sequences indicating late Holocene lake-level changes in northern central Europe — A case study from northeastern Germany

Kaiser¹,

Küster²,

Fülling³

et al. 2014

Geomorphology

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“…The two swales are located at 0.9 m asl. The berm ridge (Otvos, 2000) is slightly asymmetric with slightly steeper dips towards the sea than towards land (flank dips of 5-10°) and it is covered with stones with diameters of up to 10 cm. Locally, however, the landward-facing part of the berm ridge is developed as steeply dipping washover deposits.…”

Section: Study Sitementioning

confidence: 99%

Sea‐level markers identified in ground‐penetrating radar data collected across a modern beach ridge system in a microtidal regime

Nielsen

Clemmensen

2009

Terra Nova

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Sea‐level rise has been related to global warming. The modern system on the northern coast of Anholt, Denmark, may well be analogous to other beach ridge systems formed in microtidal regimes and our results should have impact on estimation of past sea‐level variation. Ground‐penetrating radar data collected across the modern (<30 years old) berm, beach ridge and swale deposits resolve downlapping reflections interpreted to mark sea level at the time of deposition. Existing time series of sea‐level data constrain actual sea‐level variation. Nineteen readings of sea‐level markers made along our profile fluctuate within −0.42 and 0.57 m above present mean sea level, consistent with 95% of the sea‐level data. These fluctuations reflect tidal effects and meteorological conditions. Main data uncertainties are well‐known and the sea‐level markers may be identified with a high degree of confidence.

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“…All the material of the beach embayments (Figs. 15,20 and 21) has been winnowed from the beaches of the delta fan and transported by long-shore drift driven by the impact of the oblique waves (Otvos, 2000). The larger area of the beach embayments east of the fans refl ects the predominantly easterly transport of material.…”

Section: Depositional Environments and Processesmentioning

confidence: 99%

Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile

Bell

2009

AndGeo

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ABSTRACT.A series of Quaternary lacustrine braid deltas on the shores of Lake General Carrera in southern Chile formed as a result of falls in lake level. Each delta comprises two components, the delta fan and the beach embayment, each in turn comprising an onshore subaerial and an offshore subaqueous element. The delta fans have a classic Gilbert form with a braided delta top and a steeply inclined delta front. Adjacent to the fans are concave beach embayments that formed parallel with the deltas as they prograded into the lake. The delta sediments consist predominantly of matrix-and clast-supported gravels to a total composite thickness exceeding 400 m. The depositional environments are dominated by ephemeral river fl ooding and by storm-driven waves. Beach sediment is sorted, rounded, winnowed and transported alongshore by waves to fi ll the beach embayment with ridges of very well sorted and well-rounded gravel. A gentlydipping shoreface platform occurs up to 100 m offshore between the beach and the brink point. From the brink point, in water depth of about 8 m, sediment cascades down the steep delta front slope to form long foresets extending to the lake fl oor. The sedimentary successions therefore wedge in the opposite direction from those of tectonically controlled basin margins where fan growth keeps pace with basin subsidence. RESUMEN. Deltas entrelazados lacustres del Cuaternario en el lago General Carrera, sur de Chile. Una serie de deltas entrelazados lacustres, pertenecientes al Cuaternario, ubicados en las costas del lago General Carrera, en el sur de Chile, se formaron como resultado de caídas en el nivel del lago. Cada delta consta de dos componentes: el abanico deltaico y la zona de embahiamiento. Cada uno de ellos tiene, a su vez, un elemento subaéreo costero y un elemento subacuático. Los abanicos deltaicos tienen una forma Gilbert clásica con una parte superior de ríos entrelazados y un frente deltaico empinado. Adyacente a los abanicos aluviales existen bahías cóncavas de playa que se formaron de manera paralela a los deltas a medida que estos progradaron hacia el lago. Los sedimentos deltaicos consisten predominantemente de gravas matriz y clastosoportadas con un grosor total compuesto que excede los 400 m. Los ambientes depositacionales están dominados por inundaciones efímeras del río y por olas de tormenta. Los sedimentos de playa están seleccionados, redondeados y fueron transportados a lo largo de la costa por las olas para rellenar el embahiamiento de la playa con dorsales de gravas muy bien clasifi cadas y redondeadas. Una plataforma del 'shoreface' de baja pendiente ocurre hasta 100 m agua adentro, entre la orilla y el borde. Desde el borde del lago, en el agua hasta los 8 m de profundidad, el sedimento cae en cascadas por la empinada pendiente del frente deltaico para formar grandes 'foresets' que se extienden hacia el fondo del lago. La sucesión sedimentaria se acuña, en consecuencia, en una dirección opuesta a la de aquella, de márgenes de cuenca controlados tectónicamente ('bri...

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Beach ridges — definitions and significance

Cited by 406 publications

References 31 publications

Littoral landforms and pedosedimentary sequences indicating late Holocene lake-level changes in northern central Europe — A case study from northeastern Germany

Littoral landforms and pedosedimentary sequences indicating late Holocene lake-level changes in northern central Europe — A case study from northeastern Germany

Sea‐level markers identified in ground‐penetrating radar data collected across a modern beach ridge system in a microtidal regime

Quaternary lacustrine braid deltas on Lake General Carrera in southern Chile

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