1. O. Atteia ENSEGID Bordeaux 24/3/2014
iPHT3D basics
O. Atteia
ENSEGID Bordeaux
24/3/2014

2. Objectives
Pre- and postprocess Modflow, MT3DMS and PHT3D (Sutra, Min3p)
2D, 3D and radial flow
Must be simple to use
Rapid, instantaneous visualization
Automatic interpretation of Phreeqc databases (no need to define reaction modules)

3. Major Features
Data are spatially coded (zones)  grid independent data input
X-section and Radial models
All data input are done in the same window
PHT3D data are entered as solutions and not as individual concentrations
Spatial variables can be entered as a formula, imported or interpolated
Batch capacities due to python language

4. Interface Spatial Attributes creation and management
Selecting data to be visualized
Interactive data input and viewing of results
Entering model
parameters
Toolbox

5. Spatial Attributes Value for the whole domain Modifying Zones :
values
moving
changing points
Creating Zones
Resulting grid can be viewed in Results --> variable

6. Names of modules MODFLOW MT3DMS DIS : discretization
BAS6 : base values
LPF : hydraulic conductivity
WEL : well discharge
PCG : solver options
MT3DMS
BTN : porosity, initial conditions
ADV : advection
DSP : dispersion
GCG : solver
RCT : reactions

7. Variable Grid

8. Running Modflow
Set time frame (it will be valid for all models, can be changed, but MODFLOW needs to be rerun)
Optional : change solver type or parameters
Run modflow
A dialog Box with
LAST TIME STEP
should appear

9. Visualisation of Results
Right panel, choose the time step
Verify that the boundary conditions give fixed values (head)
Visualise velocity vectors (flux)
Particle tracking
observation points can be chosen after run

10. Modify contours User-defined linear scale Remove ‘automatic’ tick !
If using log scale leave interval at 1
List values allow to fix an arbitrary list of values : [0.01, 2., 35.]
Colors can be modified

11. Transport
Boundary condition for transport must be set (often a line of fixed concentrations)
Set dispersivities
Optional: Solver or MT3DMS method parameters
MT3DMS uses flow data from MODFLOW so if you want to change transport rerun MODFLOW
Run MT3DMS

12. PHT3D Import pht3d_datab.dat
Initial conditions are given in ph.3 (solutions, zones of mineral assemblage, exchanger...)
Database rate expressions are in the phreeqc database file
But rate values, reaction formula, surface area... are in iPHT3D interface

13. Chemistry input

14. PHT3D Enter the zones for each solution (or phase assemblage)
For each zone you can associate a solution, a phase (+exchange and surface) by their numbers defined before
Run PHT3D
A dos window opens, It may take time
It is advised to start with a coarse grid and then refine it (run modflow between)