Seleção dos indicadores da qualidade das águas superficiais pelo emprego da análise multivariada

Andrade, Eunice Maia de; Araújo, Lúcia de Fátima; Rosa, Morsyleide de Freitas; Disney, Walt; Alves, Aurilea B.

doi:10.1590/s0100-69162007000400011

Cited by 66 publications

(46 citation statements)

References 7 publications

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“…Similar results were found by Andrade et al (2007) and Palácio et al (2011) in studies of surface water in the state of Ceará, where the Na + showed a high factor loading in the first component. The VF4 showed high positive coefficients for the elements Mg +2 (0.909) and Ca +2 (0.908).…”

Section: Resultssupporting

confidence: 87%

“…The Kaiser-Meyer-Olkin (KMO) sufficiency test showed an index equal to 0.60, which is considered acceptable (Silveira & Andrade, 2002), demonstrating that the model would promote significant reduction in the size of the original data (Hair Júnior et al, 2005). Andrade et al (2007) studying the determining factors for the quality of the surface waters in the watershed of the Upper Acaraú in Ceará, found a similar KMO, 0.625, also rated as acceptable.…”

Section: Resultsmentioning

confidence: 89%

“…In semiarid regions at low latitudes, dams and the artificial year-round use of rivers make up the main source of water for domestic, industrial and agricultural consumption . As an important tool in the management of water resources, the assessment of water quality, should include the monitoring of trends which evolve both spatially and over time, thus enabling the identification of those anthropic and natural factors which determine the quality of surface waters (BrodnjakVoncina et al, 2002;Andrade et al, 2007;Bouza-Deaño et al, 2008;Li et al, 2011), in an effort to support environmental control measures (Guedes et al, 2012). The evaluation of water quality, as well as its spatial and temporal evolution, will only be possible through the implementation of systematic monitoring programs, resulting in a series of historical data that in the future can be analyzed in order to establish standards for seasonal and spatial distribution.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the water quality in a large reservoir in semiarid region of Brazil

Lopes

Andrade

Meireles

et al. 2014

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe aim of this study was to identify spatial and temporal variations in water quality of Orós reservoir, Ceará, Brazil, as well as the sources of contamination. To get this information the Principal Component Analysis (PCA) and Cluster Analysis (CA) was used. Water samples were collected at seven (geo-referenced) points, from April 2008 to March 2011, totalling 4,032 samples. The following attributes of the waters were analysed: temperature, pH, CE, Ca , turbidity, colour, Sechi transparency, TS, TVS, TFS, TSS, VSS, FSS, TDS, DO, BO 5D , total phosphorus, soluble orthophosphate, EC, TTC, total ammonia, TKN, nitrate, SAR and chlorophyll-a. The PCA promoted the reduction from the 32 initial variables to 14, accounting for 84.39% of the total variance. The major factors responsible for water quality composition are: the natural weathering of geological soil components; the entrainment of suspended solids through surface runoff from agricultural areas; and anthropogenic action in the Upper Jaguaribe basin in Ceará. The similarity of the water of the Orós reservoir allows a reduction in the number of sampling points, which may result in significant cost savings without sacrificing the water quality monitoring. The similarity of the waters was influenced by anthropic activities being carried out near the reservoir and all along the watershed.Investigação da qualidade das águas de um grande reservatório na região semiárida do Brasil R E S U M O Objetivou-se estudar, com esta pesquisa, a variabilidade espaço temporal da qualidade das águas do açude Orós, Ceará, além das variáveis determinantes desta qualidade razão pela qual foram empregadas a análise de componentes principais (ACP) e a análise de agrupamento hierárquico (AAH). As amostras de água foram coletadas em sete pontos (georreferenciados), no período de abril de 2008 a março de 2011, totalizando 4032 amostras. Nas águas foram analisados os seguintes atributos: temperatura, pH, CE, Ca , turbidez, cor, transparência de sechi, ST, STV, STF, SST, SSV, SSF, SDT, OD, DBO 5 , fósforo total, ortofosfato solúvel, EC, CTT, amônia total, NKT, nitrato, RAS e clorofila-a. A ACP promoveu redução das 32 variáveis iniciais para 14 variáveis explicando 84,39% da variância total. Os principais fatores responsáveis pela qualidade das águas do Orós foram: processo natural de intemperismo dos componentes geológicos do solo; carreamentos dos sólidos suspensos através do escoamento superficial das águas oriundas de áreas agrícolas e ações humanas ocorridas nas partes altas da bacia do Alto Jaguaribe. A similaridade das águas do Orós permite uma redução nos pontos de amostragem, o que pode resultar em menor custo sem comprometer o monitoramento da qualidade das águas. A similaridade das águas foi influenciada pelas atividades antrópicas exercidas nas proximidades do reservatório e ao longo da bacia.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Assessment of the water quality in a large reservoir in semiarid region of Brazil

Lopes

Andrade

Meireles

et al. 2014

Rev. bras. eng. agríc. ambient.

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“…Esse processo maximiza a variância entre os fatores, alterando a raiz característica sem afetar a proporção da variância total explicada pelo conjunto (ANDRADE et al, 2007).…”

Section: O Melhor Comportamento Das Variáveis De Qualidade De áGua Nounclassified

Relação entre padrões de uso e ocupação do solo e qualidade da água em uma bacia hidrográfica urbana

Menezes

Bittencourt²,

Farias³

et al. 2016

Eng. Sanit. Ambient.

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“…Thus, few studies are expensive because there is always need for the presence of field staff. When the focus is the study of sediment assessment rarer are the studies (OLIVEIRA et al, 2005;OLIVEIRA, et al, 2008;BUENO, GALBIATTI, & BORGES, 2005;MENEZES, et al, 2009;ANDRADE, et al, 2007). Though the sediments in water bodies significant affect water quality, and consequently interfere in later water treatment for urban or industrial use (CARVALHO et al, 2000;OLIVEIRA et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Turbidimetry as an alternative method to determine the rating curve of suspended sediments

Poletto

Sampaio

Queiroz³

et al. 2011

Eng. Agríc.

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Understanding hydrosedimental behavior of a watershed is essential for properly managing and using its hydric resources. The objective of this study was to verify the feasibility of the alternative procedure for the indirect determination of the sediment key curve using a turbidimeter. The research was carried out on the São Francisco Falso River, which is situated in the west of the state of Paraná on the left bank of ITAIPU reservoir. The direct method was applied using a DH-48 sediment suspended sampler. The indirect method consisted of the use of a linigraph and a turbidimeter. Based on the results obtained, it was concluded that the indirect method using a turbidimeter showed to be fully feasible, since it gave a power function-type mathematical model equal of the direct method. Furthermore, the average suspended sediment discharge into the

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Seleção dos indicadores da qualidade das águas superficiais pelo emprego da análise multivariada

Cited by 66 publications

References 7 publications

Assessment of the water quality in a large reservoir in semiarid region of Brazil

Assessment of the water quality in a large reservoir in semiarid region of Brazil

Relação entre padrões de uso e ocupação do solo e qualidade da água em uma bacia hidrográfica urbana

Turbidimetry as an alternative method to determine the rating curve of suspended sediments

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