Geochemical modeling of surface water / groundwater mixing with Phreeqc and Aquifer App - Tutorial

Simple tutorial that demonstrates the geochemical simulation of surface water and groundwater, and the mixing of both in predetermined proportions. The tutorial shows the creation of an input file (*.in) for Phreeqc, which is then input into Aquifer App to obtain results for both solutions and for the mixture. The modeling and analysis process in Aquifer App are extremely straightforward since the tables and graphs are generated, allowing for quick comparison of data between simulations.

Aquifer App link:

aquifer.hatarilabs.com

Tutorial

Input files

This is the Phreeqc input file:

TITLE Surface water / groundwater mixing - SW

SOLUTION 1

    units mmol/L

    Alkalinity 7.1

    Cl    0.8

    S     25.4 as SO4

    Na    11.1

    Mg    18.5

    Ca    3

    K     1.2

SAVE solution 1

END

TITLE Surface water / groundwater mixing - GW

SOLUTION 2

    units mmol/L

    pH    7

    Alkalinity 12.5

    Cl    2.3

    S     158.5

    Na    80

    Mg    111.5

    Ca    10.4

    K     0.8

SAVE solution 2

END

TITLE Surface water / groundwater mixing - Mixing

MIX 1

    1 0.6

    2 0.4

END