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Taking into account the conceptual model, it was considered that AZ2 (upper basin) is a mixture between AZ1 (surface water from mountain area) and SL (surface water from Suco lagoon). Table 5 shows chemical and isotope data of samples used in the numerical models.

Table 5

(a) Samples used in the numerical modeling and (b) results of numerical modeling carried out with PHREEQC

(a) SampleEC (μS/cm)pHCO3−2 (mg/L)CO3H (mg/L)SO4= (mg/L)Cl (mg/L)Na+ (mg/L)K+ (mg/L)Ca+ (mg/L)Mg+ (mg/L)δ18O (‰)δ2H (‰)
SL (IS) 1,266 8.7 46 480.0 103.6 82.9 242.7 15.4 20.0 13.2 −2.0 −11.6 
AZ1 (IS) 458 8.2 185.0 43.3 16.6 30.9 5.3 38.4 4.9 −5.2 −26.6 
AZ2 (FS) 1,050 8.5 21.82 502.5 88.0 42.9 273.0 7.0 12.0 21.0 −5.1 −25.9 
(b)
SampleMixture fractionNaX (mol/L)CaX2 (mol/L)MgX2 (mol/L)CaSO4:2H2O (mol/L)
SL (IS) 0.08 0.24 0.17 0.05 0.08               
AZ1 (IS) 0.92 2.46 1.78 0.55 0.82               
(a) SampleEC (μS/cm)pHCO3−2 (mg/L)CO3H (mg/L)SO4= (mg/L)Cl (mg/L)Na+ (mg/L)K+ (mg/L)Ca+ (mg/L)Mg+ (mg/L)δ18O (‰)δ2H (‰)
SL (IS) 1,266 8.7 46 480.0 103.6 82.9 242.7 15.4 20.0 13.2 −2.0 −11.6 
AZ1 (IS) 458 8.2 185.0 43.3 16.6 30.9 5.3 38.4 4.9 −5.2 −26.6 
AZ2 (FS) 1,050 8.5 21.82 502.5 88.0 42.9 273.0 7.0 12.0 21.0 −5.1 −25.9 
(b)
SampleMixture fractionNaX (mol/L)CaX2 (mol/L)MgX2 (mol/L)CaSO4:2H2O (mol/L)
SL (IS) 0.08 0.24 0.17 0.05 0.08               
AZ1 (IS) 0.92 2.46 1.78 0.55 0.82               

IS: initial solution; FS: final solution

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