title: Evaluation of the salt accumulation process during inundation in water resource of Contas river basin (Bahia-Brazil) applying principal component analysis.
abstract: The high salinization in some reservoirs of the Contas river basin (Bahia-Brazil) has been erroneously attributed only to concentration by evaporation. However, recent studies of this basin have shown that in period of intense rainfalls, occur an increase of the saline concentration in the flowing rivers of the reservoirs. The application of statistical methods (cluster and principal components analysis) have shown that this fact can be attributed to the discharge of saline waters from the small reservoirs of every drained area, provoked by inundation, is also an important factor in the salinization process. Thus the study of the geochemical variables: Na(+), K(+), Ca(2+), Mg(2+), Cl(-), SO(4)(2-) and CO(3)(2-), showed one group formed by Na(+) and Cl(-), attributed to the discharge of saline water provoked by inundation from a small reservoir, and a second group constituted by Ca(2+), Mg(2+), K(+) and SO(4)(2-), due to an increase provoked by the evaporation in the salinization process.
authors.affiliation: Departamento de Ciências Naturais, Universidade Estadual do Sudoeste da Bahia, Estrada do Bem Querer, km 4, Caixa Postal 95, Vitória da Conquista, Bahia, Zip 45083-900, Brazil. zesoares@uesb.br
authors.forename: José Soares
authors.initials: JS
authors.lastname: dos Santos
authors.forename: Elisabeth
authors.initials: E
authors.lastname: de Oliveira
authors.forename: Roy Eduard
authors.initials: RE
authors.lastname: Bruns
authors.forename: Roselí Fernandes
authors.initials: RF
authors.lastname: Gennari
mesh_terms: D004190:Disasters; D017753:Ecosystem; D004784:Environmental Monitoring; D025341:Principal Component Analysis; D011891:Rain; D045483:Rivers; D012965:Sodium Chloride / Q000032:analysis*; D014835:Volatilization; D014872:Water Movements; D014881:Water Supply
chemical_list: D012965:Sodium Chloride