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| Grasso, Florent; Le Hir, Pierre. |
| Estuaries are subject to extensive morphological changes through human activities, such as deepening and narrowing via dredging and channelization. The estuary sediment load, characterised by the estuarine turbidity maximum (ETM), can severely increase in response to channel deepening, shifting the estuary from a natural to hyperturbid state. The main processes driving the estuarine circulation, hydrology and sediment dynamics are relatively well known. However, their relative influence on suspended sediment concentration (SSC), as well as their role in the transition toward hyperturbid estuaries, is still a subject of debate. Therefore, this study aims at investigating the relative contribution of key estuarine drivers (gravitational circulation and tidal... |
| Tipo: Text |
Palavras-chave: Estuary deepening and narrowing; Sediment dynamics; Turbidity maximum; Tidal asymmetry; Stratification; Numerical modelling; Morphological changes. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00479/59046/65965.pdf |
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| PAIVA,BÁRBARA P.; SCHETTINI,CARLOS A.F.; PEREIRA,MARÇAL D.; SIEGLE,EDUARDO; MIRANDA,LUIZ B.; ANDUTTA,FERNANDO P.. |
| ABSTRACT 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Estuarine circulation; Sediment fluxes; Morphological changes; Tidal asymmetry. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401265 |
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| ARAÚJO,ÉVERTON JOSÉ FERREIRA DE; OLIVEIRA,GUILHERME ANTÔNIO LOPES DE; SOUSA,LÍVIA QUEIROZ DE; BOLZANI,VANDERLAN DA SILVA; CAVALHEIRO,ALBERTO JOSÉ; TOME,ADRIANA DA ROCHA; PERON,ANA PAULA; SANTOS,ANDRÉ GONZAGA DOS; CITÓ,ANTONIA MARIA DAS GRAÇAS LOPES; PESSOA,CLÁUDIA; FREITAS,RIVELILSON MENDES DE; FERREIRA,PAULO MICHEL PINHEIRO. |
| ABSTRACTCasearia sylvestris Swartz is a medicinal plant widely distributed in Brazil. It has anti-inflammatory, antiulcer and antitumor activities and is popularly used to treat snakebites, wounds, diarrhea, flu and chest colds. Its leaves are rich in oxygenated tricyclic cis-clerodane diterpenes, particulary casearins. Herein, we evaluated the antioxidant activities of a fraction with casearins (FC) isolated from C. sylvestrisand histological changes on the central nervous system and livers of Mus musculus mice. Firstly, in vitro studies (0.9, 1.8, 3.6, 5.4 and 7.2 μg/mL) revealed EC50 values of 3.7, 6.4 and 0.16 µg/mL for nitrite, hydroxyl radical and TBARS levels, respectively. Secondly, FC (2.5, 5, 10 and 25 mg/kg/day) was intraperitoneally... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clerodane diterpenes; Casearia sylvestris; Antioxidant; Morphological changes; Toxicity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401791 |
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