Resultados Da Modelagem Numérica Hidrodinâmica Em Simulações Tridimensionais Das Correntes De Maré Na Baixada Santista

Harari, Joseph; Camargo, Ricardo de; Cacciari, Paulo Leão

doi:10.21168/rbrh.v5n2.p71-87

Cited by 21 publications

(26 citation statements)

References 9 publications

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“…Important outwelling events into the Santos bay were associated with current asymmetries observed during the rainy season. These asymmetries, such as conditions of convergence and divergence are common to all tidal cycle (Harari & Camargo, 1997;Harari et al, 2000) and reproduce alterations in the flow in both channels.…”

Section: Discussionmentioning

confidence: 94%

Instantaneous transport of salt, nutrients, suspended matter and chlorophyll-a in the tropical estuarine system of Santos

et al. 2005

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A B S T R A C TThe contribution of the polluted São Vicente and Santos estuarine channels to the eutrophication of Santos bay was assessed through the quantification of instantaneous transport of salt, dissolved inorganic nitrogen (DIN) and phosphate, organic and inorganic matter (OSM and ISM) and chlorophyll-a (Chl-a), during dry (austral winter-August/ 1999) and rainy (austral summerJanuary/2000) seasons. Samplings were carried out during spring and neap tides, in flood and ebb phases, in two transversal sections at the mouths of the São Vicente and Santos channels. Instantaneous transport values generally indicated importation of salt to the estuarine channels, exportation of DIN to the bay, mainly as N-NH 4 , at a maximum rate of 1155.1 g s -1 during the rainy season; importation of phosphate during the dry season (maximum of 385 g s -1 ) and exportation of ISM, OSM and Chl-a during periods of greater freshwater discharge. These results demonstrate the great contribution made by the Santos and São Vicente estuaries to the eutrophication of Santos bay, especially in the rainy season. R E S U M OA contribuição dos canais estuarinos de Santos e São Vicente para a eutrofização da baía de Santos foi avaliada quantificando-se o transporte instantâneo de sal, fosfato e nitrogênio inorgânico dissolvido (NID), material em suspensão orgânico (MSO) e inorgânico (MSI) e clorofila-a, durante a estação seca (inverno austral-Agosto/1999) e chuvosa (verão austral-Janeiro/ 2000). As amostragens foram realizadas em períodos de sizígia e quadratura, durante as marés enchentes e vazantes, nas secções transversais das bocas dos canais de São Vicente e Santos. Os valores de transporte instantâneo obtidos durante o período de amostragem indicaram exportação de NID, principalmente sobre a forma de N-NH 4 (valor máximo de 1155,1 g s -1 ) na estação chuvosa; importação de fosfato durante a estação seca (máximo de 385,6 g s -1 ) e exportação de MSI, MSO e clorofila-a em períodos de maior contribuição fluvial. Estes resultados indicam uma importante contribuição dos canais estuarinos de Santos e São Vicente para a eutrofização da baía de Santos, especialmente durante o período chuvoso.

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Section: Discussionmentioning

confidence: 94%

Instantaneous transport of salt, nutrients, suspended matter and chlorophyll-a in the tropical estuarine system of Santos

et al. 2005

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“…However, samples 11 and 12 (both located close to the former disposal site) showed a higher percentage of fines. Once the current and hydrodynamic models for the Santos Bay indicate transport towards East (Harari & Camargo, 1997;Harari et al, 2000), where the former disposal site is located, the present disposal activities may be influencing the old disposal area. In the elutriate toxicity, samples from stations 1, 5 and 6 were considered significantly toxic in all the tested dilutions, whereas elutriate from station 3 produced significant toxicity at 100% and 50% concentrations.…”

Section: Resultsmentioning

confidence: 99%

Ecotoxicological assessment of sediments from the Port of Santos and the disposal sites of dredged material

Sousa

Abessa

et al. 2007

Braz. j. oceanogr.

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A B S T R A C TThe dredging of sediments from the Santos Channel is necessary to allow the navigation of ships operating in the Port of Santos. The disposal sites for such sediments are situated on the coastal zone, in front of the Santos Bay. The present paper aimed at evaluating the toxicity of sediments collected at the Santos Channel and at the former and current sediment disposal sites. Whole sediment tests with amphipods and elutriate assays with sea-urchin embryos were used. The samples from the Santos Channel were considered the most toxic: all the sediment samples from this area showed toxicity. Moreover, some samples from both former and new sediment disposal sites exhibited toxicity. Therefore, results showed that sediments from the studied areas present evidences of degradation; however, further studies are required to determine relationships between toxicity and contamination. Results also suggested that the disposal of dredged sediments should be re-evaluated. R E S U M OA dragagem dos sedimentos do Canal de Santos é necessária para permitir o trânsito de navios que operam no Porto de Santos. As áreas de disposição do material dragado estão situadas na zona costeira, em frente à Baía de Santos. Este estudo visou avaliar a qualidade dos sedimentos do Canal de Santos e das áreas de disposição atuais e antigas, utilizando testes de toxicidade de sedimento integral com anfípodos e de toxicidade de elutriatos com embriões de ouriço do mar. As amostras do Canal de Santos foram consideradas as mais tóxicas: todas as amostras dessa área foram consideradas significativamente tóxicas. Além disso, algumas amostras das áreas de disposição exibiram toxicidade. Os resultados mostraram, portanto, que os sedimentos apresentam evidências de degradação em sua qualidade, porém novos estudos devem ser conduzidos visando determinar as relações entre contaminação e toxicidade. Os resultados sugerem ainda que a disposição dos sedimentos dragados deva ser reavaliada.

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“…Tides are semi-diurnal with magnitudes ranging from 0.5 to 1.5 m. The deepest portion of São Vicente channel is a narrow passage around 10 m deep. Numerical modeling of the main tidal components indicates asymmetries in the circulation in the São Vicente estuarine channel (HARARI; CAMARGO, 1998), common to this type of estuarine system (HARARI et al, 2000). The present study was based on two different time series performed at distinct locations in the São Vicente estuarine channel ( Fig.…”

Section: Study Areamentioning

confidence: 99%

Temporal variability of chlorophyll-a in the São Vicente estuary

et al. 2012

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A B S T R A C TEstuaries are extremely dynamic environments that are vulnerable to anthropogenic alterations. Thus, monitoring phytoplankton abundances and composition is an essential tool for the prediction of eutrophication and its effects on coastal ecosystems. Phytoplankton biomass, as chlorophyll-a, in the São Vicente estuary (Brazil) varies in response to tidal cycles and seasonal rainfall. Objectives. To present two datasets designed to assess the relationship between chlorophyll-a and changes in water turbidity driven by tide and rain. Methods. Weekly observations were made in the shallow embayment (February to September 2008; site 1) and observations recorded on alternate days (summer 2010, site 2). Results. At site 1, turbidity differed between high and low tides, but on most days was over 3000 RU, maintaining moderate chlorophyll-a levels (4 mg.m -3 ) and only two blooms developed during low turbidity. Site 2 mean turbidity was 1500 RU, nutrient level was higher during neap tides and phytoplankton blooms were mainly observed at the end of neap tides at 15-day intervals, dominated by chain-forming diatoms and occasionally flagellates and pennate diatoms. Conclusions. Taxonomic composition of the blooms was different and their frequency altered by events characterized by intense freshwater discharges from the Henry Borden Hydroelectric Dam (> 9*106.m 3 ), inhibiting phytoplankton accumulation during neap tide periods. R E S U M OEstuários são ambientes dinâmicos e susceptíveis a alterações antropogênicas. Nesses ambientes, torna-se imprescindível monitoramento do fitoplâncton na previsão da eutrofização e de seus efeitos para o ecossistema. No estuário de São Vicente (Brasil) a biomassa fitoplanctônica, como clorofila-a, varia sazonalmente em resposta às chuvas e marés. O presente estudo visa apresentar dois programas de monitoramento para detectar florações fitoplanctônicas em relação a turbidez da água guiada pelas marés e chuvas. Métodos. As observações foram semanais na porção rasa (Fevereiro a Setembro de 2008; área 1) e observações em dias alternados no canal (verão de 2010; área 2). Os resultados mostram que a área 1, turbidez acima de 3000 RU manteve níveis de clorofila-a médios (4 mg.m -3 ) e duas florações ocorreram apenas em baixa turbidez, sendo esta diferente entre marés alta e baixa. Na área 2, a turbidez manteve-se entre 1500 RU, os nutrientes foram maiores durante as marés de quadratura, e as florações tiveram frequência de aproximadamente 15 dias, no final da quadratura, predominando diatomáceas em cadeia e eventualmente flagelados e diatomáceas penadas. A composição taxonômica variou entre florações e o padrão quinzenal foi significativamente alterado durante eventos com alta descarga de água doce oriundos da usina hidroelétrica Henry Borden (> 9*106.m 3 ) o que impediu o acúmulo de fitoplâncton no período das quadraturas.

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Resultados Da Modelagem Numérica Hidrodinâmica Em Simulações Tridimensionais Das Correntes De Maré Na Baixada Santista

Cited by 21 publications

References 9 publications

Instantaneous transport of salt, nutrients, suspended matter and chlorophyll-a in the tropical estuarine system of Santos

Instantaneous transport of salt, nutrients, suspended matter and chlorophyll-a in the tropical estuarine system of Santos

Ecotoxicological assessment of sediments from the Port of Santos and the disposal sites of dredged material

Temporal variability of chlorophyll-a in the São Vicente estuary

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