Fine grain sediment transport and deposition in the Patos Lagoon–Cassino beach sedimentary system

Calliari, Lauro Júlio; Winterwerp, Johan C.; Fernandes, Elisa Helena Leão; Cuchiara, Debora C.; Vinzón, Susana B.; Sperle, Marcelo; Holland, Kieran

doi:10.1016/j.csr.2008.09.019

Cited by 86 publications

(54 citation statements)

References 18 publications

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“…Besides economically important, this international trade activity potentially adds a maninduced factor which may control the estuarine macrobenthic fauna, either through chemical accidents (Bemvenuti et al, 2003) or dredging (Bemvenuti et al, 2005). In the last 20 years, an annual average of 1.5 10 6 m 3 of silty sand sediments have been dredged from the Rio Grande Harbour area, although large quantities of finer sediments are also dredged, like clayey silt and silty clay sediments (Calliari et al, 2009 ) which drains freshwater from the Lagoa Mirim system (Hartmann & Harkot, 1990;Vaz et al, 2006). Showing a discharge pattern reliable to those on temperate regions, these tributary rivers usually present elevated water discharge on later winter and earlier spring followed by low to moderate flows through summer and autumn seasons (Möller, 1996).…”

Section: Study Areamentioning

confidence: 99%

“…The average amount of suspended matter inside the lagoon can vary between 43 and 196 mg l -1 , which gives for the Patos Lagoon an estimated long-term sedimentation rate at 0.75 mm yr -1 and a short-term sedimentation rate between 3.5 and 8.3 mm yr -1 (Calliari et al, 2009). The main navigation channel of the estuarine region is daily used as navigation routes for several cargo tank and container ships due to the Rio Grande Harbour operations.…”

Section: Study Areamentioning

confidence: 99%

“…High levels of pluviometric precipitation and the coupled fluvial discharge processes in the Patos Lagoon drainage basin are both responsible for the extensive transport of silt and clay sediments into the estuarine region, where in its channel areas the suspended matter may experience depositional processes (Calliari et al, 2009). Channel areas like these rarely have a constant navigable depth since large volumes of fine sediments deposit in their deeper parts, and subsequently their depth have to be artificially kept through periodic dredging to ensure accessibility to harbour and fish terminals, structures that are vital to the economic development of coastal regions (Engler et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Temporal dynamics of deep infralittoral macrobenthic fauna in a subtropical estuarine environment

Pinotti¹,

Colling²,

Bemvenuti³

2011

Braz. J. Aquat. Sci. Technol.

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). In order to keep the Patos Lagoon main access channel at constant navigable depths, the Rio Grande Harbour Superintendence periodically executes maintenance dredging operations on this infralittoral area, but our multivariate analyses evidenced no significant difference between dredged and non-dredged sites regardless the year. Among the abiotic parameters analyzed here (temperature, percentage of fine sediments and salinity), the later was evidenced to be highly correlated to the biological data. Reductions in density and/or changes in the species composition could both be attributed to a natural macrobenthic response related to environmental variations. Along the year 2000 high salinity values decreased constantly through seasons to almost limnetic condition in spring, reducing diversity and abundance of marine species and densities of the dominant gastropod species Heleobia australis. On the other hand, salinity values along the year 2006 revealed the maintenance of brackish waters throughout seasons, favoring the input and survival of marine species from coastal adjacent areas inside the estuary, raising its macrobenthic diversity mainly by mollusks and polychaete worms.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal dynamics of deep infralittoral macrobenthic fauna in a subtropical estuarine environment

Pinotti¹,

Colling²,

Bemvenuti³

2011

Braz. J. Aquat. Sci. Technol.

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“…Geomorphological events in the late Pleistocene created the original estuarine conditions. However, erosion and deposition processes by Holocene morphodynamics were responsible for the evolution of the present Patos Lagoon estuary (Calliari et al, 2009). The Patos Lagoon (10,360 km 2 ) can be classified as partially closed lagoon and defined as the world largest choked lagoon (Kjerfve, 1986).…”

Section: Location and Characterization Of The Study Areamentioning

confidence: 99%

Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

2017

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Qualidade trófica das águas no estuário da Lagoa dos Patos (RS, Brasil): comparação entre suas margens e o canal do porto localizado em Rio Grande, RS, Brasil Abstract: Aim:This study aimed to evaluate the Trophic State Index (TSI) at the margin and in the channel of the Patos Lagoon estuary, considering different hydrological conditions. Methods: Surface and bottom water samples were collected in three sites in the channel (margin and center) and in two sites at the Saco da Mangueira in different hydrological conditions in 2011. Results: Waters at the Saco da Mangueira are very contaminated by phosphate and nitrogenous compounds. The TSI classifies these waters as being hypereutrophic, the consequence of both the release of effluents which were poorly treated and the low water flow in the inlet. Contamination was mild at the margins of the channel, where waters were classified as being eutrophic and mesotrophic. Trophic balance (mesotrophic waters -oligotrophic surface -bottom) was found in the center of the channel as a consequence of strong water flow and dilution of contaminants coming from the margins. Conclusions: Spatial variation in the TSI value enabled clear distinction to be observed between the areas at the margins and in the channel, because it reflected the punctual presence of anthropogenic input in the marginal waters, mainly in the Saco da Mangueira. Effluent treatment must be required in order to control severe trophic imbalance in the waters at the margins of the city. Variations of the proposed index are a useful tool to identify sources of phosphate compounds in other aquatic environments.Keywords: effluents; organic contamination; phytonutrients; Trophic State Index.Resumo: Objetivo: O objetivo deste estudo foi avaliar o Índice de Estado Trófico (IET) das margens e do canal da Lagoa dos Patos, considerando diferentes condições hidrológicas. Métodos: amostras de águas da superfície e do fundo foram coletadas em 2011 em três locais no canal (margem e centro) e em dois locais do Saco da Mangueira em diferentes condições hidrológicas. Resultados: As águas do Saco da Mangueira são muito contaminadas por fosfato e compostos nitrogenados. O TSI classifica estas águas como sendo hipertróficas, como consequência de ambos, a liberação de efluentes que são pouco tratados e baixo fluxo de água na enseada. No eixo deste canal houve equilíbrio trófico (águas mesotróficas -superfície e oligotróficas -fundo), consequência da intensa circulação da água e diluição dos contaminantes oriundos das margens. Conclusões: A variação espacial nos valores do TSI indicou uma distinção clara entre as áreas nas margens e no canal, visto que refletem a presença pontual de aportes antropogênicos nas águas de margem, principalmente do Saco da Mangueira. for lagoons has also been modified with the use of nitrite-nitrogen, chlorophyll-a, and Secchi disk depth for the estimation of the status of eutrophication (Gupta, 2014). Other approaches used the trophic index TRIX, based on Chl-a, oxygen saturation, total nitrogen, and ...

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“…O grande aporte de CDOM/sedimentos provavelmente se origina da região norte devido à entrada pelo Guaíba, assim como pelos rios Arambaré, Camaquã e São Lourenço na região central da LP (CALLIARI, 2009). Para a velocidade do vento, observamos valores semelhantes, com uma influência imediata nos comprimentos de onda mais longos (acima de 667 nm), e com um atraso de 4 a 5 dias para os comprimentos de onda mais curtos, indicando que leva certo tempo para a coloração da água responder a essa forçante.…”

Section: Relação Entre Os Produtos De Sensoriamento Remoto E Medidas unclassified

Caracterização espectral das imagens de cor do oceano durante florações de fitoplâncton na Lagoa dos Patos

Jorge¹

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Fine grain sediment transport and deposition in the Patos Lagoon–Cassino beach sedimentary system

Cited by 86 publications

References 18 publications

Temporal dynamics of deep infralittoral macrobenthic fauna in a subtropical estuarine environment

Temporal dynamics of deep infralittoral macrobenthic fauna in a subtropical estuarine environment

Trophic quality of waters in the Patos Lagoon estuary: a comparison between its margins and the port channel located in Rio Grande, RS, Brazil

Caracterização espectral das imagens de cor do oceano durante florações de fitoplâncton na Lagoa dos Patos

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