[Activity models for modeling brine/rocks interactions in relatively high (>100℃) temperature]

Thanks!

[Activity models for modeling brine/rocks interactions in relatively high (>100℃) temperature]

Colleagues, 

The GWB website suggests that the "thereda2020.tdat" GWB would be released in April 2020; any idea on when this might actually occur?

Thanks

Bob Smith

[Recirculation Wells]

Hi,

I am trying Xt2 to simulate a field experiment that my group conducted in the “Anderson” well gallery at the Rifle, CO site to created a bioactive zone using recirculation wells.  In the experiment, water was pumped from a production well (M-07) and amended with urea and molasses using a metering pump and an in line pipe-mixer for 12 days and reinjected (well M-02) up-gradient.  The pumping well was shut off and the reactive zone was monitored for 400+ days.  I understand how to create the recirculation cell in Xt2 (GWB12), but I am struggling with an approach to add the urea and molasses to the injected water.  Can two fluids be injected simultaneously into a single well? Or should I look for another approach such as creating a fictive solid placed in the grid block with the well with a defined, constant release rate? Any insights would be welcome.

In addition, the Goldschmidt Reactive Transport Workshop was great.

Thanks

Bob Smith

[Flush and Cutoff Coupling]

I have been using React (Release 8.05 build 3829) to model a continuously stirred tank reactor (CSTR) using the “flush” option and have discovered the “cutoff” option does not work as I expected. I have run a set of simulation with

 

react .05 kg/day of Br-, cutoff = .1 kg

 

and

 

time start = 0 days, end = 7 days

time start = 0 days, end = 14 days

time start = 0 days, end = 21 days

 

for these three cases the total amount of Br- reacted from the React_output.txt files is 350, 700, and 1050 g, respectively. First, all these values exceed the 0.1 kg (100 g) “cutoff” and second there is a linear coupling between “cutoff” and the length of the simulation.

 

One of the input files is attached however I find this behavior in all the simulations that I have tried.

 

Thanks

 

Bob Smith

100818_Tracer.rea

[Where would you like this year's workshop(s) to be held?]

Tom,

 

I vote for "Knoxville, TN, USA (coincident with Goldschmidt" I am planning on having my post-doc attend.

 

Thanks

 

Bob Smith

Univ. of Idaho

[Inverse Biogeochemical Modeling]

Tim Ginn of UC-Davis and I are preparing to attempt to link The Geochemist’s Workbench (professional) with the UCODE (a universal inversion code) software in order to inverse model biogeochemical experiments to recover kinetic and microbial parameters. Initially we will be working with results from batch biogeochemical experiments, but ultimately we would like to recover similar parameters from column/field experiments/observations. Does anyone have experience with this type of linkage (or using PEST/ Visual PEST)?

 

Thanks

 

Bob Smith

Distinguished Professor of Subsurface Science

Biological and Agricultural Engineering

University of Idaho

[Cation Exchange Capacity in XT]

In using a cation exchange model in XT, a cation exchange capacity is required. Is this the capacity of each node or the capacity of the entire flow domain?

 

Thanks

 

Bob Smith