Sea‐tide effects on flows in the lower reaches of the Amazon River

Kosuth, Pascal; Callède, Jacques; Laraque, Alain; Filizola, Naziano; Guyot, Jean‐Loup; Seyler, Patrick; Fritsch, J.-M.; Guimarães, V.

doi:10.1002/hyp.7387

Cited by 73 publications

(107 citation statements)

References 12 publications

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“…This is typical of the Amazonian region, as well as of other regions with marked seasonality, where the river flow varies significantly throughout the year, since spatial tidal action is strongly conditioned by river discharge, as already described by Kosuth et al (2009) for the Amazon River.…”

Section: Discussionsupporting

confidence: 57%

“…A similar study has been conducted by Kosuth et al (2009) on the Amazon River, also motivating the present investigation.…”

Section: Introductionmentioning

confidence: 74%

“…Results from the Amazon River (KOSUTH, et al, 2009) as well as from other estuarine systems along the north coast of Brazil FERREIRA, 1993;SANTOS et al, 2005) also show hyposynchronic conditions in systems with tidal bores and substantial fluvial inflow. For those systems with large catchment areas and consequently large fluvial inflow this seems to be the main cause of friction and reduction of tidal range.…”

Section: Discussionmentioning

confidence: 93%

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Tide distortion and attenuation in an Amazonian tidal river

2012

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A B S T R A C TThe present study seeks to evaluate tidal propagation in the Guamá-Capim river system, in the Amazonian region, considering hydrodynamic and geomorphological aspects. Available data sets on fluvial discharge and water level variations were considered, besides several methods of measuring the tides (currents, water levels and discharges) recorded at different stations and in different periods. The main point argued is that fluvial discharge is the key-factor in tidal distortion and tidal bore formation in the system investigated, whereas the low relief of the area would be the main factor contributing to landward tidal incursion. The results show an impressive upward tidal incursion of more than 200 km, including substantial distortion -increasing upstream -of the tidal wave, of which the ebb phase lasts up to 5 hours longer than the flood, including higher flood current velocities as far as 161 km upstream. Generally, only hyposynchronous tidal response was observed. Seasonally, the fluvial discharge varies about 10 times in the Guamá and 4 times in the Capim River. The increase of the fluvial discharge results in an increasing distortion of the tide, besides a weak increase of the attenuation. During high fluvial discharge periods in conjunction with equinoctial tides (e.g. MarchApril), a tidal bore occurs in the system, also increased by the generally low relief. Therefore, the conclusions include: low relief and the distortion related to high fluvial discharges are the main factors controlling tidal propagation along the system and tidal bore formation. Furthermore, the system could be classified as a tidal river, in which massive regional fresh water input results in virtually non-existent salinity throughout the Guamá-Capim system. R E S U M OO presente estudo teve como objetivo investigar a propagação da maré no sistema fluvial Guamá-Capim, na região amazônica, considerando aspectos hidrológicos e geomorfológicos. Os métodos empregados incluem dados históricos de vazões fluviais e níveis d'água, além de medições próprias de maré em diferentes locais e períodos ao longo do sistema. Os principais pontos defendidos no presente trabalho incluem a vazão fluvial como principal fator para a distorção da maré e consequente formação de pororoca no sistema, assim como o baixo relevo da área seria responsável por incremento na incursão da maré para o continente. Os resultados revelam uma penetração da maré de mais de 200 km, ocorrendo também uma forte deformação da maré, se intensificando gradualmente a montante, resultando em uma vazante até 5 horas mais longa que a enchente 161 km a montante, apresentando também velocidades de enchente levemente superiores, incluindo o decaimento contínuo da altura da maré, intensificado a partir desse ponto. Sazonalmente, a vazão fluvial aumenta 10 vezes no rio Guamá e 4 vezes no rio Capim. Durante períodos de alta descarga, combinados com marés equinociais (e.g. março-abril), o fenômeno da pororoca ocorre no sistema, em associação ao baixo relevo da área. Desta for...

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Section: Discussionsupporting

confidence: 57%

“…A similar study has been conducted by Kosuth et al (2009) on the Amazon River, also motivating the present investigation.…”

Section: Introductionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 93%

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Tide distortion and attenuation in an Amazonian tidal river

2012

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“…C'est en travaillant « en continu » que les jaugeages sont repris en novembre 1998 puis en mars et juin 1999 (KOSUTH et al, 1999(KOSUTH et al, , 2009). Pour obtenir le débit à l'estuaire, la somme des débits mesurés à ces deux stations doit être majorée de l'apport journalier du Rio Jari (sous-bassin C) et de l'apport des sous-bassins D, E et F. Les résultats (même ceux de 1997) sont cohérents avec ceux réalisés plus en aval, à l'Embouchure.…”

Section: Les Mesures à L'entrée Amont De L'estuaire De L'amazoneunclassified

Les apports en eau de l'Amazone à l'Océan Atlantique

Callède¹,

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Alves

et al. 2010

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Cette étude détermine, par deux méthodes, indépendantes mais complémentaires, le débit moyen interannuel de l'apport liquide de l'Amazone à l'océan Atlantique. Après avoir défini, le plus logiquement possible, la limite Est du bassin amazonien, l'étude établit le bilan hydrologique de l'Amazone depuis Óbidos jusqu'à l'océan, sur la période 1972-2003. Le débit moyen interannuel à l'embouchure serait de 205 000 m3•s-1. Une seconde méthode se base sur dix séries de mesures de débit effectuées à l'embouchure de 1997 à 2008 qui se corrèlent très bien avec les débits observés à Óbidos. Cette méthode indiquerait un débit interannuel à l'embouchure de 208 000 m3•s-1, en y incluant les 6 000 m3•s-1 que représente la dérivation de l’Amazone vers le Rio Pará (et l’Océan) par les furos, canaux qui coulent dans l’ancien bras de l’Amazone. Avec une incertitude de ± 6 %, les apports interannuels de l'Amazone à l'océan, pour la période 1972-2003, seraient de 206 000 m3•s-1 et représenteraient 17 % des apports mondiaux en eau douce.

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“…Nesse contexto, o rio Amazonas se destaca pelo grande volume de descarga anual de aproximadamente 169 000 m 3 s -1 em Óbidos (Callède et al 2002;Kosuth et al 2009), com suas principais nascentes no Peru onde é conhecido como Vilcanota, recebe posteriormente os nomes de Ucaiali, Urubamba e Marañon. Quando entra no Brasil, passa-se a chamar Solimões e após o encontro com o Rio Negro, perto de Manaus, recebe o nome de Rio Amazonas.…”

Section: Introductionunclassified

Variação espacial de cátions, ânions e variáveis físico-químicas no rio Solimões-Amazonas entre Manaus e Jutaí, bacia amazônica

2015

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RESUMOCátions e ânions majoritários são espécies químicas de grande importância nos diversos compartimentos aquáticos, porém, pouco abordados de forma exclusiva na bacia amazônica. Neste sentido, o objetivo deste estudo foi avaliar a dinâmica espacial de Na Spatial variation of cations, anions and physicochemical variables in the Solimões-Amazonas River, between Manaus and Jutaí, Amazon Basin ABSTRACTMajor cations and anions are chemical species with great importance in different water compartments. However, no specific attention has been given to them in the Amazon basin. This study aimed to assess the spatial dynamic of Na + , Ca 2+ , K + , Mg 2+ , Cl -and SO 4 2-in a specific section of the Solimões-Amazonas river taking into account the alkalinity, hydrogen potential (pH), conductivity electric (EC), total suspended solids (TSS) and total organic carbon (TOC). Samples were collected in May, July and September 2012 in seven points in the Solimões-Amazonas River and in the mouth of some of its main tributaries: rivers Jutaí, Juruá, Japurá and Purus. Cations and anions were analyzed by ion chromatography, TSS by gravimetry, pH by potentiometry, alkalinity by potentiometric titration, EC by conductimetry and TOC by catalytic oxidation combustion. The average cation concentrations followed this order: Ca 2+ > Na + > Mg 2+ > K + and anion SO 4 2-> Cl. From the upstream of the river towards its downstream section there was a tendency for a decrease in cations and anions accumulation, pH, EC, TSS and alkalinity. On the other hand, there was an increase in TOC. The present study showed changes in chemical characteristics of Solimões River along its course. It was observed the contribution of the tributary rivers as one of the responsible factors for these changes.

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Sea‐tide effects on flows in the lower reaches of the Amazon River

Cited by 73 publications

References 12 publications

Tide distortion and attenuation in an Amazonian tidal river

Tide distortion and attenuation in an Amazonian tidal river

Les apports en eau de l'Amazone à l'Océan Atlantique

Variação espacial de cátions, ânions e variáveis físico-químicas no rio Solimões-Amazonas entre Manaus e Jutaí, bacia amazônica

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