/
GGU-CONTAM-FE: Short description
Document toolboxDocument toolbox

GGU-CONTAM-FE: Short description

Owned by Matthias Jusko
Last updated: Okt. 28, 2024

Since I know from personal experience that reading user-manuals is quite a chore, there will now follow a short description of the main program functions. After studying this section, you will be in a position to model contaminant propagation based on steady-state groundwater flow. You can learn about the details of the program in the subsequent chapters.

  • In order to be able to use the system entered in your GGU-2D-SSFLOW groundwater flow program for contaminant propagation modelling using the GGU-CONTAM-FE program, you must create a file in the GGU-2D-SSFLOW program with the file extension ".da1". You can create this file by going to "System/Analyse" and activating the check box "Generate record for transient modelling".

  • Start the GGU-CONTAM-FE program and using the menu item "File/Load steady-state GW data", select the desired record of a flow system.

  • Using the "Editor" menu you can define your "Soil properties". A description of the individual constants can be found in the "Info" function field.

  • The initial system concentration is specified via the menu item "Editor/Individual initial concentrations". It is possible to set the concentration individually for specific nodes, or for several nodes in section.

  • Using the "Editor/Boundary condition polygons" menu item, you specify the temporal changes in concentration as polygon courses. This is initially independent of location. By clicking on the menu item you will see a dialog box within which, by clicking the "New" field and then "Edit polygon course", you can specify the number of polygon points, i.e. the number of temporal changes in your concentrations.

  • The selection of the menu item "Editor / Assign polygons individually" enables you to assign a boundary condition polygon to a specific node of your system or a specific section.

  • Contaminant propagation modelling is started by selecting "Modelling/Start". Specify the desired end time at which the calculations are to cease. Subsequently, checks are carried out by the program (Peclet and Courant criteria). The Courant criterion determines the maximum permissible time step for your system. Before actual analysis begins, you will see this value in a dialog box. You can edit this value. The Peclet criterion principally concerns the element size; if this criterion is not satisfied, you will generally have no other choice but to analyse with a finer mesh (GGU-2D-SSFLOW).

  • Use the GGU-PLGW program for evaluation and visualisation of the modelling results; it also provides a means of printing an impressive graphic of the results. To do this, load the file generated by GGU-CONTAM-FE ("*_kon.plw") into GGU-PLGW.