![]() ![]() Because the simulation spans 30 years, groundwater velocity v x is (100 m)/(30 yr/100), or 330 m yr −1.Īnd select Run → Go to calculate the model. The simulation is configured to displace the pore fluid in the aquifer 100 times. On the Domain pane, aquifer length is set to “100 m” The mass of quartz carried in the simulation is the amount of buffering mineral shown in the Initial pane, plus the mass set in the Reactants pane, which here is 0. The rate constant k + is from Rimstidt and Barnes (1980), and the specific surface area A sp is from Leamnson et al. On the Reactants pane a kinetic law governs quartz dissolution We define a fluid called “inlet”, the rainwater recharging the aquifer, which is set to be undersaturated with respect to quartz. We set the model's time span and associate an inlet fluid with the domain's left side. Shows the conditions at the onset of the simulation. How rapidly does mineral dissolution affect the chemistry of water flowing along an aquifer composed of only quartz? Double-click on “Quartz.x1t” to calculate a reactive transport model of rainwater infiltrating such an aquifer. Where R is the gas constant, and T K is absolute temperature. The rate constant can be set directly or it can be calculated from the activation energy E A and pre-exponential factor A using the Arrhenius equation The user supplies parameters for the rate law, including a specific surface area and rate constant for each mineral. Where r is the mineral's dissolution rate, A S is the surface area of the mineral, k + is the intrinsic rate constant, a j, m j are the activity or concentration of promoting or inhibiting species, P j is a species' power (+ is promoting, − is inhibiting), and Q and K are the activity product and equilibrium constant, respectively, for the dissolution reaction. The GWB programs have a Built-in Rate Law for mineral dissolution and precipitation Click on a file or right-click and select “Save link as…” to download. ![]()
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