Morphology, hydrography and sediment dynamics in a mangrove estuary: The Konkoure Estuary, Guinea

Capo, Sylvain; Sottolichio, Aldo; Brenon, Isabelle; Castaing, Patrice; Ferry, Luc

doi:10.1016/j.margeo.2006.05.003

Cited by 51 publications

(28 citation statements)

References 24 publications

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“…Tropical estuarine ecosystems in Brazil (Porto andFonteles-Filho 1986, Thüllen andBerger 2000) and worldwide (Blaber 2002, Capo et al 2006, Lam-Hoai et al 2006) seasonal changes in salinity are mainly influenced by rainfall distribution between the seasons. In general, decreases in pluviometric precipitation during the dry season caused gradual decreases in river discharges and land run-off.…”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in the copepod community structure from a tropical Amazon estuary, Northern Brazil

Magalhães

Leite

Silva

et al. 2009

An. Acad. Bras. Ciênc.

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The main purpose of this study was to investigate the seasonal variation of copepod community structure during the months of July, September and November 2003 (dry season) and January, March and May 2004 (rainy season) in the Curuçá estuary, northern Brazil. Samples were collected during neap tides via gentle 200μm mesh net tows from a small powerboat. Measurements of surface water conductivity were accomplished in situ using an electronic conductivimeter and salinity was later obtained through the transformation of the conductivity values. Salinity varied seasonally from 7.2 ± 0.1 to 39.2 ± 1.8 (mean ± standard deviation) and was influenced mainly by differences in the amount of rainfall between the studied sampling seasons. In total, 30 Copepoda taxa were identified and Acartia tonsa comprised the most representative species throughout the entire studied period followed by Acartia lilljeborgii, Subeucalanus pileatus and Paracalanus quasimodo. In the present study, the density values, ecological indexes and copepod species dominance presented a clear seasonal pattern, showing that the studied area may be considered seasonally heterogeneous in relation to the investigated parameters.

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Section: Discussionmentioning

confidence: 99%

Seasonal variation in the copepod community structure from a tropical Amazon estuary, Northern Brazil

Magalhães

Leite

Silva

et al. 2009

An. Acad. Bras. Ciênc.

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“…Research on the Fly River Estuary, Papua New Guinea (Wolanski et al, 1995) and the Mekong River Estuary, Vietnam (Wolanski et al, 1996) has revealed similar effects in tropical estuaries, although the data in each case do not give the whole picture in relation to overall seasonal patterns. A more recent study on the Konkoure Estuary in Equatorial Guinea (Capo et al, 2006) showed similar ETM response features and also noted the effects of upstream dam construction on flow regime and ETM characteristics. Migration of sediment in response to freshwater flow is of particular interest in the case of the Mekong River owing to the effect on the estuary's sediment regime of building a dam up-river, with consequences for wildlife and navigation.…”

Section: The Etm and Its Characteristicsmentioning

confidence: 62%

Turbidity in the Thames Estuary: How turbid do we expect it to be?

Uncles

Mitchell

2011

Hydrobiologia

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A previously derived method (the tidal length-mean spring tidal range, TL-MSTR diagram) is used to predict the estuarine turbidity maximum (ETM) concentration and the residence time of the Thames Estuary. The predicted and observed residence time is 2 months. The predicted, depth-averaged ETM is 2.5 g l -1 of suspended particulate matter (SPM) at spring tides, which is much higher than that observed from surface sampling (\0.5 g l -1 ) and that simulated by recent models (approx. 0.6 g l -1 ), but is consistent with spring-tide concentrations measured throughout the water column over a tidal cycle. The observed locations of the surface 1-isohaline and 5-isohaline exhibit strong relationships with the logarithm of freshwater runoff. The observed ETM exhibits statistically significant relationships both with tidal range and the logarithm of runoff, and is generally located between the Millennium Dome and the Woolwich Reach. The apparent over-prediction of SPM afforded by the TL-MSTR diagram is unsurprising considering the removal of fine sediment by dredging and the removal of fine-sediment storage areas by embanking.

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“…Previous studies clearly demonstrate the influence and control of river flow (Q f ) on the SF response threshold inside estuaries (D) (Uncles & Stephens, 1993;Kurup et al, 1998;Capo et al, 2006). This re- lationship can be approximated by a potential regression.…”

Section: Discussionmentioning

confidence: 89%

“…This interface indicates the limit between the two water masses and is defined by an isohaline. In the literature, the SF is defined by a variety of isohaline values, such as 0.5 UPS (Capo et al, 2006), 1 UPS (Uncles & Stephens, 1993), 5 UPS (Lerczak et al, 2009) …”

Section: Salinity Front Movement (Sf)mentioning

confidence: 99%

Salinity Intrusion in the Guapimirim Estuary, Rio De Janeiro State, Brazil

Melo¹,

Neto²,

Vinzón³

et al. 2014

Rev. Bras. Geof.

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ABSTRACT. This work was conducted in the Guapimirim estuary, the main tributary of the Guanabara Bay. This system is located in a preserved area in the catchment basin of the bay, inside the Guapimirim Environmental Protection Area. The estuary presents a meandering channel with 3 meters mean depth. The aim of this work is to evaluate the salinity intrusion dynamics in response to the tide and freshwater discharge, as well as its effects on the water column structure and residence time. Surveys were performed to assess the salinity structure along the estuary main channel under different freshwater discharges (dry and rainy period) and tide (neap and spring). The results showed significant differences in the water column structure, presenting high stratification in neap tide and conditions homogeneous in spring tide. The salinity front (SF) showed a bigger displacement in the spring tide. Under highly stratified conditions, in neap tide, its displacement was bigger with smaller tidal amplitude. The location of SF inside of the estuary, in the high water, was influenced manly by freshwater discharge. The residence time in the Guapimirim estuary was longer in neap tide and dry period, presenting a good relationship with freshwater discharge.Keywords: Guapimirim estuary, salinity intrusion, residence time.RESUMO. Este trabalho foi desenvolvido no estuário de Guapimirim, principal tributário da Baía de Guanabara. Este sistema se localiza em umaárea ainda preservada na bacia de drenagem da baía, dentro daÁrea de Proteção Ambiental de Guapimirim. O estuário apresenta um canal meandrante com uma profundidade média de 3 metros. O objetivo deste trabalho consiste em avaliar a dinâmica da intrusão salina em resposta a atuação dos processos físicos como a vazão fluvial e a maré, assim como, sua consequência na estrutura da coluna d'água e tempo de residência. Foram realizados levantamentos sobre a estrutura salina ao longo do canal principal do estuário em diferentes condições de vazão fluvial (período seco e chuvoso) e maré (quadratura e sizígia). Os resultados mostraram diferenças marcantes na estrutura da coluna d'água sendo estratificado em maré de quadratura e mais homogêneo em maré de sizígia. A frente salina apresentou um maior deslocamento em maré de sizígia.Em condições de alta estratificação, em maré de quadratura, o maior deslocamento da frente salina esteve associado a uma menor amplitude da maré. A vazão fluvial foi o principal processo físico que atuou no alcance máximo da frente salina. O tempo de residência de uma parcela deágua dentro do estuário de Guapimirim foi maior em condição de maré de quadratura e em período seco, apresentando boa relação com a vazão fluvial.Palavras-chave: estuário de Guapimirim, intrusão salina, tempo de residência.

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Morphology, hydrography and sediment dynamics in a mangrove estuary: The Konkoure Estuary, Guinea

Cited by 51 publications

References 24 publications

Seasonal variation in the copepod community structure from a tropical Amazon estuary, Northern Brazil

Seasonal variation in the copepod community structure from a tropical Amazon estuary, Northern Brazil

Turbidity in the Thames Estuary: How turbid do we expect it to be?

Salinity Intrusion in the Guapimirim Estuary, Rio De Janeiro State, Brazil

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