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GGU-2D-TRANSIENT: Short description
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GGU-2D-TRANSIENT: Short description

Owned by Matthias Jusko
Last updated: Okt. 29, 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 transient groundwater flow. You can learn about the details of the program in the later chapters.

  • In order to be able to use the system entered in your GGU-2D-SSFLOW groundwater flow program for transient modelling using the GGU-2D-TRANSIENT 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-2D-TRANSIENT program and, using the menu item "File/Load GW data", select the system from which you would like to analyse transient groundwater flow.

  • Then, using the "File/Load boundary values" menu item, either load boundary values defined in a previous sitting into the system or specify new boundary conditions using the menu "Time BC" or "Fixed BC".

  • Using the "Time BC/Soil properties" menu item, you can query the soil properties which you defined in GGU-2D-SSFLOW. This list is supplemented by information on the specific storage coefficient. In the case of a vertical-plane system, you can define your specific soil curves, using modelling points and according to soil type, by clicking on the "nw = f(u)" field (cf. Figure 1 in Section "Soil properties" menu item).

  • Using the menu item "Time BC/Edit polygon courses" you specify the temporal change in, e.g., a potential boundary condition. This is initially independent of location. By clicking on the menu item you will see a dialog box within which, by clicking on the "New" button and then "Change polygon course", you can specify the number of polygon points, i.e. the number of temporal changes in your potentials.

  • Assign system nodes a boundary condition polygon using "Time BC/Point potential or source".

  • With the help of the "Modelling/Start" menu item the program analyse the transient groundwater flow with the user-defined boundary conditions. You can specify the final time and the temporal increment in the dialog box.

  • 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-2D-TRANSIENT ("_t.plw") into GGU-PLGW. An initial evaluation can also be carried out parallel to modelling.