Characteristics of Tidal Channels in a Mesotidal Estuary of Argentina

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

doi:10.2112/1551-5036(2004)020[0489:cotcia]2.0.co;2

Cited by 25 publications

(25 citation statements)

References 9 publications

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“…Generally, the smaller channels (gullies and creeks) flow into the large tidal channels and these latest flows into the Principal Channel. The width and depth ranges the former may from few tens of centimeters up to 1m, while the large channels could have reach more than 10m depth and width of 1km in their mouth (Ginsberg & Perillo, 2004). In plan view, the courses of large channels have shown a low to medium sinuosity pattern while the smaller channels are predominantly strongly sinuous or meandering and their curvatures increases inward.…”

Section: General Characteristics Of Channel Systemsmentioning

confidence: 99%

Sediment Transport Circulation Pattern through Mesotidal Channels System

Ginsberg¹,

Aliotta²

2011

Sediment Transport

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Section: General Characteristics Of Channel Systemsmentioning

confidence: 99%

Sediment Transport Circulation Pattern through Mesotidal Channels System

Ginsberg¹,

Aliotta²

2011

Sediment Transport

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“…Según Ginsberg & Perillo (2004), los canales de marea mayores (canales principales y secundarios) poseen cursos que tienden a ser rectos o levemente sinuosos, con profundidades superiores a los 10 m y un ancho que en algunos casos llega a superar 1 km en la boca. Los canales menores tienen, en general, cauces meandrosos con un ancho y una profundidad de hasta 1 m. Sus márgenes están formadas por amplias llanuras intermareales y sus fondos poseen diferentes características sedimentoló-gicas y rasgos morfológicos.…”

Section: áRea De Estudiounclassified

“…Estos cuerpos sedimentarios se disponen aproximadamente paralelos a la dirección de la corriente de reflujo, la cual es la que generalmente adquiere valores de velocidades mayores (Ginsberg & Perillo, 2004;Vecchi et al, 2005). Normalmente, en planta, exhiben una configuración curvada, mientras que en sección transversal presentan un perfil asimétrico.…”

Section: áRea De Estudiounclassified

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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“…1) and comprising an area of 2,300 km 2 at low tide (Angeles, 2002). It is made up of a complex network of tidal channels, extensive tidal flats, low marshes and islands (Ginsberg & Perillo, 2004). The general circulation is dominated by a stationary and semidiurnal tidal wave (Serman, 1985).…”

Section: Introductionmentioning

confidence: 99%

“…The different types of channels occurring within the Bahía Blanca estuary are large tidal channels, creeks and gullies and smaller channels in general, presenting a reversible circulation (Ginsberg & Perillo, 2004). Different plankton associations can inhabit these channels, depending on the geomorphologic and hydrodynamic characteristics, with some differences in composition from those known to occur along the Main channel of the estuary, and perhaps giving rise to some differences in the particular spatial and seasonal pattern.…”

Section: Introductionmentioning

confidence: 99%

Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina

Hoffmeyer

Cao

2007

Braz. j. oceanogr.

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In this study we investigate for the first time the zooplankton assemblages in a relatively small tidal channel called Bahía del Medio, situated in the middle-outer area of the Bahía Blanca Estuary, South of the Main channel. We focused the study on micro- and mesozooplankton assemblages with emphasis on tintinnids, copepods and meroplankton along the annual cycle 1997-1998. Fifteen species of tintinnids belonging to 6 genera were observed in the study area, the mean total tintinnid abundance fluctuating between 3.4 x 10(6) ind. m-3 and 5.1 x 10(6) ind m-3. The mesozooplankton comprised 11 taxa, total abundance fluctuating between 449 ind m-3 in March 1997 and only 1 ind m-3 in October 1997. The channel proved to be spatially homogeneous in its physical and biochemical features. Micro- and mesozooplankton abundance displayed a high degree of spatial homogeneity, though the seasonal variation in both environment and zooplankton was significant. Comparison with the zooplankton observed at a station in the Main channel of the estuary showed differences in number of taxa represented, a general lower abundance of both assemblages and the presence of some rare species, a fact which is discussed.
Neste estudo pesquisamos pela primeira vez as associações do zooplâncton num pequeno canal de maré, relativamente novo e chamado Bahía del Medio, localizado na região média-exterior do estuário da Bahía Blanca e ao sul do canal principal. Focalizamos o estudo no micro- e mesozooplâncton com ênfase nos grupos Tintinnida, Copepoda e meroplâncton, ao longo do ciclo anual 1997-1998. Foram observadas 15 espécies de Tintinnida pertencentes a 6 gêneros; a abundância média total de Tintinnida variou entre 3,4 x 10(6) ind. m-3 e 5,1 x 10(6) ind. m-3. O mesozooplâncton apresentou 11 taxa e uma abundância total entre 449 ind. m-3 em março de1997 e 1 ind. m-3 em outubro de 1997. O canal provou ser espacialmente homogêneo em suas características biológicas, químicas e físicas. A abundância do micro- e mesozooplâncton mostrou um alto grau de homogeneidade espacial, embora a variaçao estacional fosse significativa nas características do meio ambiente e do zooplâncton. A comparação com o zooplâncton observado em uma estação de amostragem no canal principal do estuário mostrou diferenças no número de taxa, na abundância, em geral mais baixa, e na presença de algumas espécies raras , fato esse comentado

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Characteristics of Tidal Channels in a Mesotidal Estuary of Argentina

Cited by 25 publications

References 9 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

Zooplankton assemblages from a tidal channel in the Bahía Blanca Estuary, Argentina

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