Linaer Sand Banks in the Southern North Sea

Caston, V.N.D.

doi:10.1111/j.1365-3091.1972.tb00003.x

Cited by 153 publications

(104 citation statements)

References 6 publications

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“…The origins of sand ridges or banks are closely related to hydrodynamic conditions and generally require tidal seas with current speeds greater than 0.5 m s 1 − to move sand to form ridges (Caston 1972;Belderson et al 1982;Pattiaratchi and Collins 1987;Dyer and Huntley 1999;Anthony and Leth 2002). Of particular, importance is the role of tidal currents (Stride 1982).…”

Section: Hydrodynamicsmentioning

confidence: 99%

Morphology, Hydrodynamics and Sediment Characteristics of the Changyun Sand Ridge offshore Western Taiwan

Liao¹,

Yu²

2005

Terr. Atmos. Ocean. Sci.

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TAO, Vol. 16, No. 3, August 2005 622 Mainly medium to coarse-grained sands have accumulated on the Changyun Ridge to form sand banks. At the northern outlet of the Penghu Channel, the shoaling topography of the Changyun Ridge has caused a decrease in tidal current velocity and the subsequent deposition of sands, forming the present Changyun sand ridge. The formation of the eastern and western Changyun sand ridges is probably affected mostly by the tidal current patterns in the areas north of the Penghu Channel.

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Section: Hydrodynamicsmentioning

confidence: 99%

Morphology, Hydrodynamics and Sediment Characteristics of the Changyun Sand Ridge offshore Western Taiwan

Liao¹,

Yu²

2005

Terr. Atmos. Ocean. Sci.

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“…Según Caston (1972), el desarrollo de bancos mareales en la boca de canales sugiere que los mismos están asociados a un suministro significativo de sedimento. Por lo tanto, la presencia del banco La Lista (Fig.…”

Section: Discussionunclassified

Sistema interconectado de canales de marea del estuario de Bahía Blanca, Argentina: evaluación de la circulación de sedimento como carga de fondo por métodos acústicos

Ginsberg¹,

Aliotta²,

Lizasoain³

2009

Lat. Am. J. Aquat. Res.

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RESUMEN.El estuario de Bahía Blanca, ubicado al sur de la provincia de Buenos Aires (Argentina), constituye una costa baja con extensas llanuras de marea, islas y una compleja red de canales de diferentes magnitudes. Estos últimos integran un sistema de canales interconectados. El objetivo de este trabajo es establecer la circulación sedimentaria como carga de fondo en un sistema de canales interconectados (Cabeza de Buey, El Alambre, La Lista y Principal) mediante el análisis de los rasgos morfológicos de fondo, utilizando métodos acústicos (ecosonda y sonar lateral). El canal Cabeza de Buey se comunica con el canal La Lista a través del canal El Alambre. Los dos primeros vierten sus aguas en el canal Principal. El canal Cabeza de Buey posee un lecho plano constituido por material pelítico con arena muy fina. En su tramo más interno se presentan dunas medianas compuestas por arena fina, con un perfil asimétrico según el reflujo. Estas formas, continúan su desarrollo ininterrumpidamente hacia el canal El Alambre, donde se originan dunas grandes (altura 1,5 m) formadas por arena muy fina. Sus crestas son sinuosas o barjanoides y poseen su talud hacia la corriente de bajante. En el canal La Lista se determinan dunas asimétricas medianas orientadas según el reflujo y grandes lineaciones sedimentarias (sand ribbons) sobre un fondo consolidado. El sedimento movilizado por la corriente corresponde a la fracción limo-arena fina. La distribución y configuración de las geoformas evidencian que el transporte sedimentario como carga de fondo se concentra principalmente en el canal La Lista. Es así como en el sistema de canales estudiado, sólo un canal de marea regula la dispersión de arena, transportando un importante volumen hacia el canal de navegación. Palabras clave: estuario, canales interconectados, métodos acústicos, formas de fondo, transporte de sedimento, Argentina.An interconnected system of tidal channels in Bahía Blanca estuary, Argentina: an evaluation of bedload sediment transport through acoustic methods ABSTRACT. Bahía Blanca estuary located in the south of Buenos Aires province, Argentina, is characterised by a low coastal area with large tidal plains, islands, and a complex network of tidal channels of different dimensions. The latter form an interconnected tidal channel system. The aim of this study was to determine the net bedload sediment transport in an interconnected channel system (Cabeza de Buey, El Alambre, La Lista, and Principal channels) through an analysis of the morphological features of the bottom using acoustic data (echosounder and side scan sonar). Cabeza de Buey channel is connected to La Lista channel through El Alambre channel. The first two flow into the Principal channel. Cabeza de Buey channel has a flat bed of mud with very fine sand and medium-sized dunes of fine sand in its inner sector that display an asymmetrical section according to the ebb flow. These dunes continue to develop uninterrupted towards El Alambre channel, where large dunes (1.5 m high) of very fine sand originat...

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“…SFCRs and similar shoals are found globally, including the Brazilian, Argentinian, Canadian, Dutch, and US Atlantic continental shelves (Figueiredo et al 1982, Parker et al 1982, Hoogendoorn and Dalrymple 1986, Caston 1972, McBride and Moslow 1991. SFCRs are found on storm-dominated coasts and typically exist as sandy, rhythmic features of about 10 km length, 2-4 km spacing, 1-10 m amplitude, and 30° orientation oblique from the shoreface .…”

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.

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Linaer Sand Banks in the Southern North Sea

Abstract: CASTON, V. N. D., 1972.Linear sand banks in the southern North Sea. Sedimentology, 18:63-78.

Cited by 153 publications

References 6 publications

Morphology, Hydrodynamics and Sediment Characteristics of the Changyun Sand Ridge offshore Western Taiwan

Morphology, Hydrodynamics and Sediment Characteristics of the Changyun Sand Ridge offshore Western Taiwan

Sistema interconectado de canales de marea del estuario de Bahía Blanca, Argentina: evaluación de la circulación de sedimento como carga de fondo por métodos acústicos

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

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