Post Analysis

Workflow context
For the workflow context, see 📘 Results & Visualization
This tool is for post-processing (analysis and visualization) of previously executed IGW-NET groundwater simulations, including steady and unsteady flow, and simulations involving particle tracking and/or plume fate & transport modeling.

The tool can also be used for downloading model outputs such as 3D velocities, cell fluxes, simulated water table, and more (options also available for downloading watershed model outputs).

  A. Select a Model
  B. Particle Tracking Analysis
  C. Save Current Layer to a raster file
  D. Save Water Table to a tif file
  E. Save cell flux to a tif file
  F. Save X-section water table data
  G. Download Others
  H. View Result at Time Stamp (Transient Models)
  I. Monitoring Well
  J. Calibration


A. Select a Model

The 'Current or Last Model' option will load last executed transient simulation on the IGW-NET user account.

'Uploaded Model' requires loading a (downloaded) .zip IGW-NET model file. If the desired model has already been uploaded to the Server, users can choose it from the dropdown menu.

B. Particle Tracking Analysis

Click this button to open the 'Particle Tracking and Delineation Tool'.

This tool allows visualizing particle locations and particle pathlines for any time-step in a transient model. (In the Post Analysis tool, only the last time-step will show the particle locations and/or particle pathlines. Previous time-steps will only show flow and plume modeling results.)

The tool also allows delineation of downstream or upstream impact areas (i.e., particle pathline envelopes) for different travel times, which can be exported as GIS shapefiles.

C. Save Current Layer to a raster file

This tool allows users to save selected results from the current layer (in the case that more than one vertical layer exists in the model) as a raster file (ASCII or GeoTif formats), including:
- Head - simulated hydraulic head distribution
- Concentration - simulated solute concentration (single-species reactive fate and transport modeling).
- Recharge - recharge input to the groundwater model
- Conductivity - aquifer hydraulic conductivity distribution
- Top Elevation - aquifer layer top elevation surface
- Bottom Elevation - aquifer layer bottom elevation surface

D. Save Water Table to a tif file

For 3D models of an unconfined aquifer, the water table may not always exist entirely in the top-most computational layer; sometimes, it might extend down into lower computational layers (see the Figure below for an example).

This tool allows IGW-NET users to extract the spatially variable water table - for a specified time-step - as a continuous surface (geotiff file), regardless of the model layer(s) in which it occurs.

(NOTE: use 'SaveModel' > 'Latest Water Table' under 'Other Tools' to save the water table elevations as a text file that can be utilized directly in IGW-NET.)

WaterTableAcrossLayers



E. Save cell flux to a tif file

This tool allows users to extract and display and/or download simulated flux results from the uploaded (previously executed) model. Extraction of results for a steady model needs to be done just once before saving or overlaying. Extraction for a transient model needs to be done for each selected time stamp.

The steps to use this tool are:
- 1) Select a time stamp (if a transient model)
- 2) Click 'Extract Flux Results'. Wait a few moments for extraction (models with many numerical cells will take longer for extraction).
- 3) Select a flux type from the drop down-menu (e.g., Storage, Well fluxes, Recharge, River fluxes, etc.)
- 4) Click 'Overlay current layer' to update the map display with the flux results, and/or 'Save Zip file (current Tstamp) to download flux results (all types) of the currently selected Time Stamp. (It is not possible at this time to download all flux results for all Time Stamps).

Note that, when overlaying the flux results, the results are automatically placed on top of the Main Model results (e.g., Contours and Vectors). To return the Main Model results to the "top", click 'ShowOverlay' / 'HideOverlay' under 'Other Tools'. (Similarly, to place flux results back on top, just click 'Overlay current layer' in the Post Analysis menu once more.)

F. Save X-section water table data

This tool is used to extract model parameters along the drawn cross-section, including: hydraulic heads; groundwater velocity; aquifer elevations; hydraulic conductivity; and computational layer elevations (if applicable). The output file is a .csv file that can be edited in a text editor, Microsoft Excel, etc.

Data can be extracted for a single time-step, multiple time-steps, or all time-steps.

G. Download Others

This tool allows downloading 3D model outputs, or recharge outputs from watershed models. There is also an option to download results from automated parameter estimation.
SW Recharge - simulated recharge from SwaNET (SWAT-based) watershed model
INFIL Annual Recharge - simulated recharge from IGW-NET (INFIL-based) watershed model
3D Velocity - simulated 3D velocities from 3D IGW-NET groundwater model
3D Layer Elevation - IGW-NET 3D model layer elevations
Est Result - results from automated parameter estimation done in IGW-NET

H. View Result at Time Stamp (Transient Models)

By default, the last time-step will be loaded once a transient model is selected. Use the browsing window to select a different time-step, then click 'Apply' to update the display. For the current time-step, the user can analyze: plan-view results (contours, vectors, etc.), cross-sections, 3D model visualization, model nodal values, and/or the current water balance.

H. Monitoring Well

Selecting 'Extract' in this section directs IGW-NET to extract transient model results at all monitoring wells located in the modeling domain, and display the results in a time-series chart. (If you close the chart, click the 'Chart' button to re-open it.).

Note that a monitoring well(s) can be added AFTER the simulation is complete and while using the Post Analysis tool (Conceptual Model Tools > Wells > DrawWell > Monitoring Well). The results will automatically be extracted from the previously completed transient simulation. (Wells included in the previously executed model are also available.)

Click the '>>' button to view the options for chart customization, including: rescaling the x- or y-axis; changing marker / line thickness; and adding observed and/or observed data for selected subsets of monitoring wells in the model.

The options for interpolation ('3D Weighted' vs. '3D Trilinear') are used in the case that the well screen interval spans multiple vertical computational layers (3D models only).

I. Calibration (Transient Chart)

This option allows the user to compare simulated heads (x,y,z,t) to a corresponding observed water level (same approximate location and time). This option also allows plotting and/or comparing transient water level trends to simulated trends.

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