GMS:HydroGeoSphere

HydroGeoSphere (HGS) is a three-dimensional control-volume finite element simulator created by Aquanty. HGS can be used to model the entire terrestrial portion of the hydrologic cycle. It uses a globally-implicit approach to simultaneously solve the 2D diffusive-wave equation for overland/surface water flow and the 3D form of Richards’ equation for variably saturated groundwater flow. GMS allows multiple HGS simulations to exist in a single GMS project.

HydroGeoSphere Simulations

The GMS interface for HydroGeoSphere contains multiple components. These components include:

• An unstructured grid (UGrid)
• HydroGeoSphere coverages
• HydroGeoSphere simulation, including the Simulation Control

Creating a New HydroGeoSphere Simulation

Example of a MODFLOW 6 simulation in the Project Explorer

To create a MODFLOW simulation:

1. Right-click on an empty space in the Project Explorer, or right-click on " Project" in the Project Explorer, and select New Simulation | HydroGeoSphere.

A 3D UGrid of the project area is required. While the project can contain multiple UGrids, only one UGrid can be attached to each HGS simulation. The desired UGrid will need to be linked to the HGS simulation.

HGS Simulation Right-Click Menus

In the Project Explorer, right-clicking on a HGS simulation brings up a menu with several commands. Some of these commands are common to other Project Explorer In the Project Explorer, right-clicking on HGS simulation brings up a menu with several commands. Some of these commands are common to other Project Explorer right-click menus. Others are unique to the simulation right-click menus. Some of these unique commands are:

• " Simulation Data"
  • Simulation Run Queue – Opens the Simulation Run Queue dialog which shows all current simulation runs.
• " HydroGeoSphere Simulations"
  • New Simulation – Creates a new MODFLOW 6 simulation in the Project Explorer. This simulation will not contain any of the packages in any existing simulations and therefor the packages must be added. Also, creating a new simulation using this method requires linking a UGrid to the simulation.
  • Save Multiple Simulations – Saves all HGS simulations in the project and exports all files needed for the model run.
• Model
  • Simulation Control – Opens the Simulation Control dialog where the HGS simulation parameters are set.
  • Materials – Opens the HGS Materials dialog.
  • Export – Saves out the simulation files.
  • Run grok – Opens the Run grok.exe dialog where GMS will generate the GROK file. The GROK file contains all of the information and instructions required for the HGS simulation.
  • Run phgs – Opens the Run phgs.exe dialog where the HGS simulation will run.
  • Run hsplot – Opens the Run hsplot.exe dialog which will post-process the simulation results for viewing.
  • Solution Plots – Opens the Solution Plots dialog which will display plots generated from the HGS solution.
  • Save Simulation – Saves the simulation and exports all files needed for the model run.
  • Save Project and Simulation – Saves the simulation and exports all files needed for the model run.
  • Read Solution – Loads the solution file for the associated simulation. Requires that the simulation has had a successful run.

HGS Executables

Running HGS requires multiple executable. These include:

• grok.exe – A pre-processor that uses the Grok input file containing the information and instructions for the HGS simulation.
• phgs.exe – Performs the model simulation.
• hsplot.exe – A post-processor that generates the simulations results.

External Links

• HydroGeoSphere website
• HydroGeoSphere Theory
• HydroGeoSphere Reference Manual