Similaridade e fatores determinantes na salinidade das águas superficiais do Ceará, por técnicas multivariadas

Palácio, Helba Araújo de Queiroz; Neto, José Rino; Meireles, Ana Célia Maia; Andrade, Eunice Maia de; Santos, Júlio César Neves dos; Chaves, Luiz Carlos Guerreiro

doi:10.1590/s1415-43662011000400011

Cited by 22 publications

(30 citation statements)

References 13 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%

“…As the demand for water resources in the world increases, the likelihood of providing fresh water decreases. As an aggravating factor, in recent decades water quality has been deteriorating rapidly, which prevents the use of important reservoirs (Alexandre et al, 2010;Palácio et al;, Li et al, 2011Guedes et al, 2012). These studies demonstrate the tendency of water resources to become ever scarcer, both quantitatively and qualitatively, should no clear action be taken which is aimed at improving the management of the supply and demand of water for different uses.…”

Section: Introductionmentioning

confidence: 96%

“…This type of analysis reduces the observational data and allows the interpretation of various components individually, since it can indicate associations between samples and/or variables, and also allows identification of possible factors and sources which influence the water system (Bouza-Deaño et al, 2008;Palácio et al, 2011;Guedes et al, 2012;Varol et al, 2012).…”

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: Introductionmentioning

confidence: 96%

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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“…In water sources in the state of Ceará, in Northeast Brazil, they observed a strong correlation of electrical conductivity with sodium, magnesium, calcium, hardness and chloride, that is, dissolved solids [23]. Further strengthening the strong correlation between electrical conductivity and dissolved solids, the authors of [24] found a correlation exceeding 0.9 for the electrical conductivity and the chlorates.…”

Section: Descriptive Statistics Of the Original Variables And Correlamentioning

confidence: 99%

Influence of Extreme Strength in Water Quality of the Jucazinho Reservoir, Northeastern Brazil, PE

Melo

Barbosa

Ferreira

et al. 2017

Water

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Abstract:The Jucazinho reservoir was built in the State of Pernambuco, Northeastern Brazil, to water supply in a great part of the population that live in the semi-arid of Pernambuco. This reservoir controls the high part of Capibaribe river basin, area affected several actions that can compromise the reservoir water quality such as disposal of domestic sewage, industrial wastewater and agriculture with use of fertilizers. This study aimed to identify the factors that lead to water quality of the Jucazinho reservoir using a database containing information of nine years of reservoir water quality monitoring in line with a multivariate statistical technique known as Principal Component Analysis (PCA). To use this technique, it was selected two components which determine the quality of the reservoir water. The first principal component, ranging from an annual basis, explained the relationship between the development of cyanobacteria, the concentration of dissolved solids and electrical conductivity, comparing it with the variation in the dam volume, total phosphorus levels and turbidity. The second principal component, ranging from a mensal basis, explained the photosynthetic activity performed by cyanobacteria confronting with the variation in the dam volume. It observed the relationship between water quality parameters with rainfall, featuring an annual and seasonal pattern that can be used as reference to behaviour studies of this reservoir.

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“…Besides natural causes (Lloret et al, 2008;Chellappa et al, 2009;Fragoso Jr. et al, 2011;Palácio et al, 2011), anthropogenic factors for reservoir eutrophication are numerous. It includes contamination by nutrients and pollutants resulting from agricultural and cattle raising activities, non-treated effluents of urban areas, and aquaculture systems (Hadas et al, 1999;Brainwood et al, 2004;Ma et al, 2009;Strauch et al, 2009;Kang et al, 2010;Moreno-Mateosa et al, 2010).…”

Section: Amentioning

confidence: 99%

Soil attributes functionality and water eutrophication in the surrounding area of Itaparica Reservoir, Brazil

Filho

Gunkel

Sobral³

et al. 2013

Rev. bras. eng. agríc. ambient.

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In semi-arid areas of Brazil, climate and geological conditions are important factors that restrict the availability of soils and water for sustainable irrigated agriculture. The main objective of this study was to evaluate functionalities of physical and chemical attributes of soils and to provide information about irrigation water quality in the margins of the Itaparica Reservoir aiming the sustainable land use. Available data of 44 representative soil profiles comprising 21 profiles of Arenosols, six of Ferralsols, five of Luvisols, six of Planosols and six of Cambisols were used. Water samples along the margins of the reservoir were analysed to obtain information on water quality. The results indicated a narrow relationship between the functionalities of physical and chemical attributes and the parent material of the soils. The low nutrient availability and high water permeability are the typical characteristics of the soils developed on the sandy covers. On the other hand, higher nutrient availability and permeability restrictions are the most important features of the soils with larger influence of fine sediments. The results also suggested the process of water eutrophication in the Itaparica Reservoir.

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Similaridade e fatores determinantes na salinidade das águas superficiais do Ceará, por técnicas multivariadas

Cited by 22 publications

References 13 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

Influence of Extreme Strength in Water Quality of the Jucazinho Reservoir, Northeastern Brazil, PE

Soil attributes functionality and water eutrophication in the surrounding area of Itaparica Reservoir, Brazil

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