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Registros recuperados: 36 | |
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Goes Filho,Adbeel. |
This paper presents the practical application of concepts, and some methods of risk analysis, to check the possibility of overcoming a water level of project in the spillway of dam Orós, by excess of influent flow. Also evaluated the empirical formulas contained in the original design. Due to the difficulty of obtaining design data from the dam, since the end of construction date of January, 11, 1961, we minimize the effects of some variables in the calculations, leading us to the consequent simplification of the scenario under study. For a better evaluation and characterization of the setting, some variables in the model such as water level, accumulation and flow of the spillway, had updated their data to June 28, 2011. We have demonstrated the importance... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Risk analysis; Public dams; Reservoirs; Water resources management. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100405 |
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Martins,Isabela; Sanches,Barbara; Kaufmann,Philip Robert; Hughes,Robert M.; Santos,Gilmar Bastos; Molozzi,Joseline; Callisto,Marcos. |
Reservoirs are artificial ecosystems with multiple functions having direct and indirect benefits to humans; however, they also cause ecological changes and influence the composition and structure of aquatic biota. Our objectives were to: (1) assess the environmental condition of Nova Ponte Reservoir, Minas Gerais state, southeastern Brazil; and (2) determine how the aquatic biota respond to disturbances. A total of 40 sites in the littoral zone of the reservoir were sampled to characterize physical and chemical habitat, land use, and benthic macroinvertebrate and fish assemblages. The predominant type of land cover near the reservoir was natural vegetation. A total of 29 fish species and 39 macroinvertebrate taxa were collected, including eight alien... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reservoirs; Water quality; Bioindicators; Physical habitat; Environmental quality. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100103 |
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ESPÍNDOLA,E. L. G.; MATSUMURA-TUNDISI,T.; RIETZLER,A. C.; TUNDISI,J. G.. |
With the purpose of analyzing the horizontal distribution of the zooplankton community of the Tucuruí Reservoir in the State of Pará, Brazil, collections were made at 16 stations during August 1988. The stations cover the regions called Caraipé (C), Araçagi (B) and Ararão (A), and represent the different compartments of this ecosystem in regard to the morphometry and the presence or absence of "flooded forest". Our findings showed the existence of three compartments with different limnological characteristics determined as a function of the system's morphometry, a factor that may have influenced the horizontal circulation of the reservoir's water and, consequently, led to physical, chemical and biological differences at each of the sampled stations. All... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zooplankton; Horizontal distribution; Spatial heterogeneity; Reservoirs. |
Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200001 |
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Toledo,Zorayda; Simaluiza,Rosa Janneth; Fernández,Heriberto. |
ABSTRACT: Occurrence and antimicrobial resistance profiles of Campylobacter jejuni and C. coli strains isolated from fecal samples of dogs, pigs, cows and hens in southern Ecuador were studied. Of the 250 samples studied, 84 (33.6%) were Campylobacter positive, with C. jejuni being more frequent (78.6%) than C. coli (21.4%), with the exception of porcine samples, from which C. coli was the only species isolated. Multidrug resistance was reported in 10 Campylobacter strains (11.9%), four C. jejuni and six C. coli, and was always associated with nalidixic acid and ciprofloxacin resistance. All of the amoxicillin-resistant strains were susceptible to amoxicillin-clavulanic acid and were therefore beta-lactamase producers. However, one strain of C. jejuni... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Campylobacter; Reservoirs; Domestic animals; Antimicrobial resistance. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100450 |
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Dorneles,Elaine Maria Seles; Pellegrin,Aiesca Oliveira; Péres,Igor Alexandre Hany Fuzeta Schabib; Mathias,Luis Antônio; Mourão,Guilherme; Bianchi,Rita de Cassia; Olifiers,Natalie; Rocha,Fabiana Lopes; Lage,Andrey Pereira. |
A serological survey in free-ranging crab-eating foxes (Canidae: Cerdocyon thous) and brown-nosed coatis (Procyonidae: Nasua nasua) was performed in the Nhecolândia sub-region of the Brazilian Pantanal to evaluate the presence of anti-smooth Brucella antibodies on those wild populations. The detection of anti-smooth Brucella antibodies was performed by the Rose Bengal Test (RBT) as screening test and the Fluorescence Polarization Assay (FPA) as a confirmatory test. The frequency of smooth Brucella seropositive animals were 13.2% (5/38, 95% CI: 4.4% - 28.1%) for crab-eating foxes and 8.8% (3/34, 95% CI: 1.9% -23.7%) for brown-nosed coatis. No association was found between seropositivity for brucellosis and gender or age. The results of this study suggest... |
Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Brazil; Brucella; Pantanal; Cerdocyon thous; Nasua nasua; Reservoirs; Epidemiology. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001202193 |
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Dias, Nelson Wellausen; Batista, Getulio; Targa, Marcelo dos Santos; Novo, Evlyn Marcia Leão Moraes; Barbosa, Claudio Clemente. |
As águas do rio Paraíba do Sul apresentam um alto nível de degradação ambiental em função do despejo direto de efluentes domésticos sem tratamento e de contaminações de origem difusa (sedimentos, nutrientes e matéria orgânica) provenientes do carreamento de solo erodido, fertilizantes, pesticidas, herbicidas e dejetos de animais para os canais de drenagem. Comparativamente, a água do reservatório de Paraibuna possui qualidade de água significativamente superior aos demais trechos do Rio Paraíba do Sul devido ao fato de estar a montante dos principais centros urbanos do Vale do Paraíba. Entretanto as águas que abastecem esta represa são provenientes de duas bacias (Paraibuna e Paraitinga) com características de cobertura e uso do solo bastante distintas que... |
Tipo: Article |
Palavras-chave: Represas; Sedimentação; Sensoriamento remoto hiperespectral; Hyperspectral remote sensing; Reservoirs; Sedimentation. |
Ano: 2006 |
URL: http://hdl.handle.net/2315/41 |
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The increasing number of deteriorating old dams that need renovation or have lost their function make dam removal a viable management option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail, or result in a compromise such as a bypass channel for migrating fish. We identify and discuss three major obstructions to dam removal: funding, cultural-historical values, and threatened species. To facilitate dam removal, the reasons for, and the effects of, dam removal must be carefully explained, and the public and stakeholders must be kept... |
Tipo: Peer-Reviewed Insight |
Palavras-chave: Controversies; Dam removal; Information; Obstructions; Reservoirs; Rivers; Stakeholder involvement; Sweden. |
Ano: 2009 |
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Leboulanger, C; Bouvy, M; Pagano, M; Dufour, Robert; Got, P; Cecchi, P. |
This study focused on the effects of two pesticides, paraquat (herbicide) and deltamethrin (insecticide), which are two common molecules used intensively in Burkina Faso. Natural bacterial populations, phytoplankton cultures (one cyanobacterium, Cylindrospermopsis raciborskii, and one chlorophycea, Monoraphidium sp.), and two species of zooplankton (Diaphanosoma excisum and Moina micrura) were isolated from aquatic communities and were used as biological targets in the experimental protocols. Paraquat was moderately toxic to bacteria and phytoplankton, whereas deltamethrin was significantly toxic only to the zooplankton species. Paradoxically, the chlorophycea Monoraphidium sp. exhibited a significant increase of in vitro fluorescence after 48 h at the... |
Tipo: Text |
Palavras-chave: West Africa; Reservoirs; Planktonic organisms; Deltamethrin; Paraquat. |
Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-5287.pdf |
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De Fries,Lucas; Rosa,Gilberto da; Silva,José Pezzi da; Vilella,Fábio Silveira; Becker,Fernando Gertum. |
ABSTRACT Fish reproduction in floodplain rivers is often linked to flow regime and with the inundation of floodplain habitats. However, in confined rivers, where floodplains are absent, the relation between reproduction and flow can in comparison be expected to be distinct. In this study, we describe the reproductive life-history of Hemiancistrus fuliginosus and Hypostomus isbrueckeri in a confined river and discuss its differences relative to floodplain loricariids and also the implications for effects of dam construction and flow regulation. We found the reproductive peak of both species occurred during lowering waters, just after maximum river flow, in contrast to floodplain species that tend to spawn during rising waters. The studied species presented... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversity; Environment; Flow regulation; Hydropower; Reservoirs. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400209 |
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Registros recuperados: 36 | |
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