GGU-3D-TRANSIENT: Short description
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-3D-SSFLOW groundwater flow program for transient modelling using the GGU-3D-TRANSIENT program, you must create a file in the GGU-3D-SSFLOW program with the file extension ". f3d_is" an. You can create this file by going to "File/Export to GGU-3D-TRANSIENT".
Start the GGU-3D-TRANSIENT program and, using the menu item "File/Load", select the system from which you would like to model 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-3D-SSFLOW. This list is supplemented by information on the specific storage coefficient. According to soil type, you can define your specific soil curves, using modelling points by clicking on the "nw = f(u)" field (cf. Figure 1 further below). The soil permeability can be altered as a function of the time using the "k = f(t) [0]" button.
Using the menu item "Time BC/Edit polygon coursees" 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 "Edit 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 "System/Model" menu item the program model the transient groundwater flow with the user-defined boundary conditions. You can specify the final time and the temporal increment in the dialog box.
For visualisation and evaluation of the modelling results proceed to either the "Times", "Evaluation" or "3D" menu. You can almost always leave the subsequent dialog boxes using the "OK" button, without having to make further changes. The program will usually suggest sensible input. The "Determine extreme values" switch, which appears in a number of dialog boxes, should be clicked once however, otherwise an error message will appear. You can also use the tools in the 3D toolbar directly to evaluate and visualise your modelling results.
If you have a colour printer correctly installed in WINDOWS, you can create colour output by going to "File/Print and export" and then pressing the "Printer" button in the subsequent dialog box. For black and white printers, grey scales will be used.
This short description demonstrates that only a few items need be selected to modell a transient groundwater system. All further menu items deal principally with saving data, layout and further evaluation of the model, where required. The description will ensue in the following chapters.