Appendix B - VM Flex GUI and Input Files

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Appendix B - Correlating Items in the GUI to Input Files for Engines

MODFLOW (2000, 2005, NWT)

A brief description of these files is listed below

 

BAS: Basic Package

Array data originates from various spots in the Input:

View/Edit Grid (Active/Inactive cells)

Properties / Initial Heads

Define Boundary Condition (Constant Heads only, steady state only)  

 

Some settings are defined at Translate step, check the Initial Heads option.  

 

Reference files in this package may include the following external array files (one each per layer, with the digit suffix representing the layer index):

 

OPEN/CLOSE Name.BAS.ibound1

Active flag for each cell: active, constant head, or inactive

 

OPEN/CLOSE Name.BAS.head1

Initial head value for each cell; the values will depend on what option you chose for Initial Heads at the Translate step.

 

DIS: Discretization Package

Contains the spatial and temporal discretization; also contains the units. Array data originates from Input, View/Grid (# rows, cols, layers, layer top, layer bottom). Some settings are defined at Translate step, Time Steps.  Units are defined in Proj settings.  # Stress periods is based on the boundary conditions in the input.

The first sets of arrays contains the cell width.

The second set of arrays contains the cell height.

Note: These only need to be defined once, since all layers in a finite difference model must have same cell width and height

 

After that are links to the cell elevation for each layer.

 

OPEN/CLOSE Name.DIS.Top' 1 (FREE) -1  #Top Elevation

The cell top elevation value for cells in layer 1

 

OPEN/CLOSE Name.DIS.Bot1' 1 (FREE) -1  #Bottom Elevation of layer 1

The cell bottom elevation value for layer 1

 

Property Packages

 

BCF: Block Center Flow package

Used for MODFLOW-2000 and 2005

Array data originates from Input/Properties.  Conductivity and Storage.

Some additional settings are defined at Translate step, mainly using the Layer types, Rewetting, and Anisotropy options.

 

Details on the Referenced files from within this package are explained below:

 

Starting at line 5:

OPEN/CLOSE Name.BCF.ss1' 1 (FREE) 0  #Ss (specific storage) for layer 1

(this file will contain cell-by-cell values for specific storage, for layer 1)

 

OPEN/CLOSE Name.BCF.hk1' 1 (FREE) -1  #HK for layer 1

(this file will contain cell-by-cell values hydraulic conductivity values for layer 1)

 

OPEN/CLOSE Name.BCF.vcont1' 1 (FREE) 0  #VCONT for layer 1

(this file will contain cell-by-cell values VCONT values for layer 1)

 

If you have enabled additional options such as Anisotropy "As Specified" or Cell Re-wetting, you may see references to additional parameters.

 

LPF: Layer Property Flow Package

Same as BCF; the main difference is that Kz is explicitly defined (there are no values for VCONT or Transmissivity)

 

OPEN/CLOSE 'Conceptual Model 1.LPF.hk1' 1 (FREE) -1  #HK for layer 1

(this file will contain cell-by-cell values for Horizontal Conductivity (Kx) for layer 1)

 

OPEN/CLOSE 'Conceptual Model 1.LPF.vka1' 1 (FREE) -1  #VKA for layer 1

(this file will contain cell-by-cell values for Vertical Conductivity (Kz) for layer 1)

 

OPEN/CLOSE 'Conceptual Model 1.LPF.wetdry1' 1 (FREE) -1  #Wetdry for layer 1

(this file will contain wet dry flags for layer 1)

 

UPW: Upstream Weighting Package

Same format as LPF package.

 

Boundary Conditions

These are specified at the "Define Boundary Conditions" step in the numerical modeling workflow.

 
The following boundary conditions use format "Layer, Row, Column, parameter, ...." in their package (and do not use arrays)

 

Constant Head

River

General Head

Drain

Wall (HFB)

Specified Flux

Wells

 

The format of these packages is described in the USGS MODFLOW documentation.  The remaining boundary conditions in VMOD Flex require defining values in one or more arrays. These are described below.

 

 

Recharge (RCH)

Array data originates from Input, Define Boundary Conditions/Recharge and EVT.

Some settings are defined at Translate step, Recharge.

 

Name.RCH.recharge0' 1 (FREE) -1  #Recharge

Contains cell-by-cell recharge rate for stress period 1.

 

Name.RCH.recharge1' 1 (FREE) -1  #Recharge

Contains cell-by-cell recharge rate for stress period 2.

 

***This is repeated for subsequent stress periods for a transient simulation

Comment: need a test project that distinguishes between top layer and topmost active layer

 

Evapotranspiration (EVT)

Array data originates from Input, Define Boundary Conditions/Evapotranspiration

Some settings are defined at Translate step, Recharge and EVT.

In the input (click on database), you define the following parameters:

Evapotranspiration Rate
Extinction Depth

 

Name.EVT.elevation' 1 (FREE) -1  #Elevation

Contains the ground elevation values for layer 1

 

Name.EVT.evapotranspiration0' 1 (FREE) -1  #Evapotranspiration

Contains the evapotranspiration rate for each cell, for stress period 1.

***This is repeated for subsequent stress periods for a transient simulation

 

Name.EVT.depth0' 1 (FREE) -1  #Extinction Depth

Contains the exctinction depth values for each cell, for stress period 1

***This is repeated for subsequent stress periods for a transient simulation

 

Lake (LAK)

Array data originates from Input, Define Boundary Conditions/Lakes

Some settings are defined at Translate step, "Lakes"

 

Name.LAK.lkarr1' 1 (FREE) -1

Active/inactive cells; for any cell that is defined with a lake, it must be marked as inactive.

 

Name.LAK.bdlknc1' 1 (FREE) -1  #Lake bed leakance for layer 1

Lake bed leakance for each cell, for layer 1.  This is calculated from the parameters defined for the lake at the Boundary conditions step.

 

ZONEBUDGET

 

.ZBI contains the array of cells, and what zone ID is assigned to each cell.  All layers are contained within a single file.

 

MODPATH

.MPT file is the main input file; it contains some general information at the top.

 

Details on the Referenced files from within this package are explained below:

 

OPEN/CLOSE 'Conceptual Model 1.MPT.ibound1' 1 (FREE) -1

Active/inactive flag for cells, for layer 1. (the values are the same as those in the .BAS package)

 

OPEN/CLOSE 'Conceptual Model 1.MPT.ep1' 1 (FREE) -1  #Ep (Effective Porosity) for layer 1

Effective porosity values for each cell, for layer 1.  These values originate from the Define Properties step, "Storage" parameters.

 

 

MT3DMS / RT3D / SEAWAT

 

AD3 Advection

Advection schme and settings; defined at the Translation step, MT3DMS Translation settings

 

BT3 (Basic Transport)

Contents of this file:

Cell column data (cell width): this is based on the cell dimensions.  There is just one array for all layers in the model

Cell row delta (cell height): same as above

Htop/water table elevation: Top elevation of the cell, or the water table elevation, whichever one is higher. There is just one array.

 

You can find this by looking at the cell dimensions at the Input/Grid step

Layer Thickness: one array per layer. This is based on the cell height.  You can see this at the view/edit grid step.

Porosity: one array per layer.  Input for this is defined at Define Properties/Storage. (note: Total [default] or effective porosity can be selected here)

icbund: active/inactive cells for layer 1.  (1=active, 0=inactive)

Starting Conc. (SCONC) - Layer 1:  at Define Properties/Initial Concentration step.

 

Also contains the "saved" output times for the MT3DMS run; these are defined at the Translate step, under MT3DMS node.

 

DP3 (Dispersion)

Contains the Dispersion parameters; these are defined at the Define / Properties step, Long. Dispersion.

 

RC3 (Chemical Reactions)

Contains the chemical reaction parameters; these are defined in Flex as "Species Parameters" and "Model Parameters".  Default values and some global parameters are defined at the Define Modeling Objectives step; cell-by-cell values for model parameters and species parameters are defined/assigned/edited at the Define Properties step.

 

SS3 (Sinks / Sources)

Contains the Sink/sources (transport boundary conditions). These are defined at the "Define Boundary Conditions" step; these can be Constant Concentration, concentrations assigned to Pumping Well rates, or can be species concentrations for existing boundary conditions such as River, Recharge, EVT.

 

GCG Solver

Solver parameters and time steps; defined at the Translation step, MT3DMS/RT3D/SEAWAT Translation settings

 

SEAWAT Only

VDF (Variable Density Flow)

Contains the variable density settings and parameters; some of these parameters are defined at the Define Modeling Objectives step; settings and a few relevant parameters are set using the advanced Transport Engine settings at the Translation step.

 

VSC (Viscosity)

Contains the viscosity package settings and parameters; some of these parameters are defined at the Define Modeling Objectives step; cell-by-cell values are defined at the Define Properties step; settings and a few relevant parameters are set using the advanced Transport Engine settings at the Translation step.

 

 


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