Deep-scour holes at tidal channel junctions, Bahia Blanca Estuary, Argentina

Ginsberg, Silvia Susana; Perillo, Gerardo M. E.

doi:10.1016/s0025-3227(99)00019-5

Cited by 31 publications

(25 citation statements)

References 13 publications

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“…Although, erosion and deposition is take place at each face during the tidal cycle, there is always certain dominance of one of these processes based on the asymmetry of the tidal currents. As pointed out by Kjierfve et al (1979) and Ginsberg & Perillo (1999) the nature of the tidal circulation associated to this zone and estimates of the sediment transport pathways are related to flood-dominance acting on the steep sides of tributaries mouth and the ebb-dominance acting over the gentler outer side. The latter authors observed that holes migrate toward the inner sector of channels, in an opposite pattern to fluvial holes.…”

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 92%

“…To determine the flood/ebb dominance in the net transport through several sectors of channels has been made an approach depending on both the duration of each tidal phase and also its peak velocity. Tidal currents observations carried out in some tidal channels of Bahía Blanca estuary by Montesarchio & Lizasoain (1981); NEDECO-ARCONSULT (1983); Ginsberg & Perillo (1999; Vecchi (2009); Ginsberg & Aliotta, (2009) indicate that the behaviour of tidal currents during the flood phase is different from the ebb phase (Fig. 5).…”

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 98%

“…At La Lista mouth, their estimates indicate that the sediment transport decreases to reach 0.02188 g cm -1 s -1 , also in ebb direction. Ginsberg & Perillo (1999), estimate the sediment transport at Tres Brazas and Tierra Firme channels, based on the theory where the bedload sediment transport is proportional to the stream www.intechopen.com power (Bagnold, 1966). The results of these studies showed the following values: 489 erg cm 2 s -1 for inner sector of Tres Brazas channel and 379 erg cm 2 s -1 for the other channel.…”

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 99%

“…In this particular case, the spatial patterns of flow structure and bedload transport will depend on the morphological characteristics of the area. Various authors (Kjierfve et al, 1979;Ginsberg & Perillo, 1999;Aliotta et al, 2004;Ginsberg et al, 2009 a;Vecchi, 2009) have studied the dynamic conditions at the junction/bifurcation area of channels and they came to the conclusion that sediment movement in this zone follows a very complicated pattern. The flow bifurcation or junction creates steeper surfaces at the mouth of each confluent channel and a gentle sloping on the opposite downstream side.…”

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 99%

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Sediment Transport Circulation Pattern through Mesotidal Channels System

Ginsberg¹,

Aliotta²

2011

Sediment Transport

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Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 92%

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 98%

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 99%

Section: Estimation Of the Bedload Sediment Transport And Relationshimentioning

confidence: 99%

See 2 more Smart Citations

Sediment Transport Circulation Pattern through Mesotidal Channels System

Ginsberg¹,

Aliotta²

2011

Sediment Transport

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“…1), los cuales se interconectan formando un sistema hidrodinámicamente vinculado. Son relativamente escasos los estudios relacionados con los mismos, pudiendo mencionarse las publicaciones realizadas por Ginsberg & Perillo (1990, 1999 y Angeles et al (2004). En consecuencia, el objetivo de la presente contribución es, mediante el análisis de las geoformas y materiales que constituyen el lecho, definir el modelo circulatorio de los sedimentos movilizados como carga de fondo en un sistema conformado por canales de marea interconectados.…”

Section: Introductionunclassified

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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Sediment Transport, Bed Morphology and the Sedimentology of River Channel Confluences

Best

Rhoads

2008

River Confluences, Tributaries and the Fluvial Network

111

116

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ContextRiver channel confluences are sites of significant hydraulic and morphological change within fluvial networks (Richards, 1980;Rhoads, 1987;Ferguson et al., 2006; Lane, this volume, Chapter 3) and also occur within river channels where islands or bars are present. The local and downstream effects of confluences can have a profound influence on the geomorphology and ecology of river channels -see, for example, Rice et al.-as well as on strategies for effective channel management (Pinter et al., 2004). For these reasons, the morphology of river channel confluences is of major importance within a range of considerations and disciplines. For example, scour-depth predictions at channel junctions are clearly needed in the design of engineering structures, whilst the recognition of confluence scour is important in reconstructions of ancient sedimentary environments (Bristow et al.

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Deep-scour holes at tidal channel junctions, Bahia Blanca Estuary, Argentina

Cited by 31 publications

References 13 publications

Sediment Transport Circulation Pattern through Mesotidal Channels System

Sediment Transport Circulation Pattern through Mesotidal Channels System

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

Sediment Transport, Bed Morphology and the Sedimentology of River Channel Confluences

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