Residual fluxes of suspended sediment in a tidally dominated tropical estuary

Schettini, Carlos Augusto França; Pereira, Marçal Duarte; Siegle, Eduardo; Miranda, Luíz Bruner de; Silva, Mário P.

doi:10.1016/j.csr.2013.03.006

Cited by 38 publications

(18 citation statements)

References 39 publications

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“…The SSC data were converted from OBS turbidity records applying conversion equations made by Pereira et al (2010) for the SeaPoint OBS probe, given by SSC(OBS)=127.6 OBS + 3.8, and by Schettini et al (2013) for the JFE-Advantech CTD-logger, given by SSC(OBS)=1.03 OBS -1.05.…”

Section: Methodsmentioning

confidence: 99%

Circulation and suspended sediment dynamics in a tropical estuary under different morphological setting

Paiva

Schettini

Pereira³

et al. 2016

An. Acad. Bras. Ciênc.

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Estuarine processes are directly related to the interaction of its forcing conditions with the local morphology. In this study we assess the implications of the opening of a new inlet on the hydrodynamics and suspended sediment concentration (SSC). A set of physical parameters have been measured in the Itanhém river estuary, a small, shallow and mangrove fringed tropical estuary in Northeastern Brazil. Field surveys have been conducted in August 2007 and January 2008, separated by an important morphological change. Our observations show that even shortening the lower estuary channel in 2 km, the inlet opening did not imply in changes in the estuarine circulation. However, SSC increased after the inlet opening. General estuarine circulation showed synodical modulation of tidal asymmetry and residual suspended sediment transport. The estuary showed flood dominance at spring tide and ebb dominance at neap tide. Although not directly changing the estuarine hydrodynamics, the morphological change resulted in an important increase in SSC. This increase might be related to a facilitated import of inner shelf sediment through a shorter channel, having important implications for the estuarine sedimentation processes.

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Section: Methodsmentioning

confidence: 99%

Circulation and suspended sediment dynamics in a tropical estuary under different morphological setting

Paiva

Schettini

Pereira³

et al. 2016

An. Acad. Bras. Ciênc.

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“…The ABS is related to the concentration of SPM and can be used as a proxy of it when a calibration curve can be achieved (e.g. Hess & Bedford, 1985;Flagg & Smith, 1989;Heywood et al, 1991;Byrne & Patino, 2001;Gartner & Cheng, 2001;Land & Jones, 2001;Gartner, 2002;Zaleski & Schettini, 2006;Schettini & Zaleski, 2006;Schettini et al, 2010;Schettini et al, 2013), thus providing an enhanced visualization of the SPM distribution in time and space as function of the ADCP setting.…”

Section: Spm From Adcpmentioning

confidence: 99%

Hydrodynamics and Particulate Suspended Matter Transport in a Shallow and Highly Urbanized Estuary: The Cocó Estuary, Fortaleza, Brazil

Freitas¹,

Menezes²,

Schettini³

2016

Rev. Bras. Geof.

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ABSTRACT. This study evaluates the hydrodynamics of the Cocó river estuary (Fortaleza, Ceará State, Brazil). Two 25-hour campaigns were carried out in different tide conditions during summer. Water level variation and current speed and direction data were acquired using an Acoustic Doppler Current Profiler (ADCP). Surface and bottom salinity and temperature data were collected using a Conductivity and Temperature (CT). Samples of surface and bottom water were collected every hour in order to determine Suspended Particulate Matter (SPM). The salinity and temperature vertical profiles showed an homogeneous behavior during most of the time in both campaigns, although during neap tide, small differences were observed due to low tidal range and consequent lower mix present in the Cocó river. The SPM concentration variation presented a direct correlation with tidal waves, increasing at the surface and at the bottom during floods and then decreasing during ebb tide. The Cocó river estuary is an importer of SPM during spring and neap tidal conditions, with larger negative transport during neap tides. Furthermore, the estuary presented as highly turbulent in both tidal conditions, although during neap tide the stratification overcame the turbulence in some situations.Keywords: circulation, water quality, tides. RESUMO. Este estudo avalia a hidrodinâmica do estuário do rio Cocó (Fortaleza, Ceará). Duas campanhas de 25 horas foram realizadas em diferentes condições de maré durante o verão. Foram adquiridos dados de variação do nível daágua e dados de velocidade e direção de corrente utilizando um Acoustic Doppler CurrentProfiler (ADCP). Dados de salinidade e temperatura de superfície e de fundo foram coletados usando um Conductivity and Temperature (CT). Amostras deágua de superfície e de fundo foram coletadas a cada hora a fim de determinar Material Particulado Suspenso (MPS). Os perfis verticais de salinidade e temperatura mostraram um comportamento homogêneo durante a maior parte do tempo em ambas as campanhas, porém, durante maré de quadratura, pequenas diferenças foram observadas devidoà baixa amplitude das marés e consequente menor mistura no rio Cocó. A variação de concentração de MPS apresentou uma correlação direta com as ondas de maré, aumentando na superfície e no fundo durante as inundações e, em seguida, diminuindo durante a vazante. O estuário do rio Cocóé um importador de MPS durante as condições de marés de sizígia e de quadratura, com transporte negativo maior durante as marés de quadratura. Além disso, o estuário se apresentou como altamente turbulento em ambas as condições de maré, embora durante maré de quadratura a estratificação superou a turbulência em algumas situações.Palavras-chave: circulação, qualidade daágua, marés.

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“…Nevertheless, there are not many studies of the fine sediment dynamics of this area, and the few that are available do not report the presence of ETM. The fine sediment dynamics of the Caravelas estuary, Bahia has been assessed (SCHETTINI; MIRANDA, 2010;SCHETTINI et al, 2013), despite the fact that this estuary presents a very small freshwater inflow, and the major source of sediments is the inner shelf. Such conditions are unfavorable to the formation of ETM.…”

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confidence: 99%

Observation of an Estuarine Turbidity Maximum in the Highly Impacted Capibaribe Estuary, Brazil

et al. 2016

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Residual fluxes of suspended sediment in a tidally dominated tropical estuary

Cited by 38 publications

References 39 publications

Circulation and suspended sediment dynamics in a tropical estuary under different morphological setting

Circulation and suspended sediment dynamics in a tropical estuary under different morphological setting

Hydrodynamics and Particulate Suspended Matter Transport in a Shallow and Highly Urbanized Estuary: The Cocó Estuary, Fortaleza, Brazil

Observation of an Estuarine Turbidity Maximum in the Highly Impacted Capibaribe Estuary, Brazil

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