< Previous60 Figure 5-1: Projection option box in the Default Parameters and Options menu. 5.1.2 Simulation Status After the PRJ system is selected, the Status Bar (see Section 2.2) will provide information on the current status of the model submitted for simulation (see Table 5-1 for examples). Pay attention to the progress of the model. If there is an issue with the simulation process, an error message will be shown (see the last row in Table 5-1). Sometimes simply re-submitted the model for simulation will alleviate the issues (e.g., if there is an issue reaching the IGW server). In other cases, editing/refinement if input data/files may be necessary (e.g., if the format for user input file is not correct). Table 5-1: Examples of Status Bar messages displayed while submitting a model for simulation After the head/solute distribution is solved for the initial time-step, the Status Bar will read “Done: Geo/comp …. In progress”. The resulting head (and solute distribution) will be shown within the model display in the MDWA (see Figure 5-2 for an example). A cross-section, shown as a yellow polyline spanning the entire model from west-east (W-E) along the central portion of the domain, is automatically generated for visualizing vertical characteristics of the aquifer system (see Section 5.4). Customizing the display of results is explored in the next section. 61 Figure 5-2: Example of simulation results (head and concentration). Note that the solute concentration is indicated with the color overlay (red = high concentration; blue = low concentration). 5.1.3 Pausing, Editing, and Submitting New Models Pausing a Model. At any point in the simulation, users can pause it by LM clicking on the ‘Pause’ button along the left-side of the MAGNET Modeling Environment (see Section 2.4). MAGNET will finish its calculations and the model redraws for the present time step before appearing idle. Once the simulation is paused, the user may: • Add particles for particle tracking (note that this will reset the particle tracking clock – see Section 5.6). • View model results and perform analyses (see Sections 5.3-5.6 and Chapter 6) • Update display options (see Section 5.2) • Hide/show the model results, or reset./save the model (see Chapter 7) After making adjustments, the user can resume simulation by clicking on the ‘Forward’ button along the life-side of the MDWA. The option to run the simulation in reverse (e.g., for the purposes of reverse particle tracking), LM click on the ‘Backward’ button instead. Editing and Submitting a New Model. Any changes to the model conceptualization (e.g., conceptual features added or updated, the aquifer elevations are assigned differently, etc.) require that the model is re-submitting for simulation. Once the red ‘SIMULATE’ is selected, a prompt will appear asking the user to 62 confirm a RESET of the currently running model. Select ‘OK’ to implement the changes to the model conceptualization. If ‘Cancel’ is selected, an option to load the currently running model is provided. If a model domain of a different size is desired (e.g., in the case of hierarchical modeling – see Section 3.6), use ‘DomainRect’ or ‘DomainZone’ to draw the new model domain (see Section 3.1). Note that the results of the old model will be lost, although they may still be utilized for assigning boundary conditions of the new model (see Section 3.6). 5.2 Display Options MAGNET provides the user with a variety of options concerning the visualization of modeling parameters and results in the Working Area. This section details those options. Figure 5-3 presents the display options available in the Default Model Parameters and Options menu. Figure 5-3: Display options available in MAGNET. 5.2.1 Options for Displaying Flow Results Use the ‘Display Option’ pull-down menu to choose how the groundwater flow results will be displayed: • with black head contour lines and velocity vectors • with a head color map overlaid by black contour lines and velocity vectors • with velocity vectors only • with head contours only • and with a color map only Examples of each are shown in Figure 5-4. The text box next to ‘Overlay Transparency:’ determines the transparency level (0-100%) of the groundwater flow results overlay. By default, this is set to zero. When using the color map for display, check the radio box next to ‘Show Color Map Legend’ to add a legend to the top-left portion of the model domain. Units of head are meters in MAGNET. 63 Figure 5-4: Different ways to display the groundwater flow results (head distribution and seepage velocities). Vector Characteristics. The density of velocity vectors shown in the display is determined by the number grid cells to skip before drawing another velocity vector, both in the X (W-E) and Y (N-S) directions. Use the text boxes provided next to ‘Draw Vector Every:’ to specify how often a velocity vector should be drawn in the display. By default, vectors are drawn every grid point in both the X and Y directions. The length of the vectors is controlled by specifying the maximum velocity vector length (in terms of display pixels. 5.2.2 Options for Displaying Model Inputs In addition to displaying model results, MAGNET allows for plan-view visualization of model inputs. This includes: • hydraulic conductivity • top and bottom aquifer elevations • recharge • land use/land cover • soil type • aquifer thickness • transmissivity 64 To display a model input, check the radio box next to ‘Display Input’, then select the model variable from the corresponding drop-down menu (see Figure 5-5). Click ‘OK’ to save the changes, then re-submit the model for simulation12. The model inputs will appear in the model domain when the simulation is finished. Figure 5-5: Drop-down menu used to select an model input for display. Examples of model inputs being displayed within the model domain are shown in Figure 5-6 Figure 5-6: Examples of displaying model inputs in the MDWA. 5.2.3 Displaying Simulated Seepage Area One of the options in the ‘Display Input’ drop-down menu is ‘Seepage Area’. When this is selected and the radio box next to ‘Display Input’ is checked, the updated display will include purple cross-hair graphics in locations where groundwater is seeping to the surface (i.e., water is leaving the aquifer to discharge to a surface water body such as a stream, lake, wetland, etc.). An example is shown in Figure 5-7. 12 It is only necessary to re-submit the model for simulation when performing steady-state modeling. If performing transient modeling, simply pause the model, update the display input option, then run the model forward. The updated display input option will appear after the following simulation time-step is solved. 65 Figure 5-7: Example of using the ‘Seepage Area’ option from the ‘Display Input’ drop-down menu to indicate areas where groundwater is discharging at the land surface. By default, the land surface is used as the top elevation for computing seepage (in the case where the hydraulic head is larger than the top elevation). However, an offset can be applied to determine where the hydraulic head is higher than some distance below the land surface. For example, one might be interested in knowing where the water table intersects the root zone (about 1 ft. below the surface) across the model domain. To apply an offset, check the radio box next to ‘Seep: Elev -’, and enter the offset amount (units: meters) in the provided text box. The ‘W=’ text box is used to specify the length (units: pixels, or px) of each cross-hair used to depict a grid cell in which seepage is occurring. 5.2.4 Exporting to Google Maps/Earth Checking the radio box next to ‘high resolution image sends back a double-resolution image of current model output13. To view the model inputs and simulation results in Google Earth, check the radio box next to ‘Show on GE’. After the model simulation is completed, a link, ‘(GE KML)’, will be available in the Default Model Parameters and Options menu. Click on the link to download the .kml file to be loaded in Google Earth. An example kml file opening in Google Earth is shown in Figure 5-8. The value in the text box next to ‘GM Overlay Delay Time:’ is the delay time (units: milliseconds) to be used for displaying updated model results in Google Earth. 13 This feature is being phased out of the next version of MAGNET. 66 Figure 5-8: Example of displaying flow model results in Google Earth. 5.2.5 Hiding and Re-Displaying Simulation Results When the simulation is completed/paused, the plan-view simulation results can be hidden from the display using the ‘HideOverlay’ in the lower-left side of the MDWA (see Section 2.7). All simulation results (e.g., head contours, velocity vectors, particle paths, concentration colormap, etc.). The model domain (shown in red), cross-section polyline (shown in yellow and the conceptual features (e.g., zone extents and polylines) will remain in the MDWA (see Figure 5-9). After the ‘HideOverlay’ button is clicked, it will become the ‘ShowOverlay’ button, which can be used to re-display the simulation results. 67 Figure 5-9: Example of using the 'HideOverlay' button to temporarily remove the simulation results from the MDWA. 5.3 Model Values at a Node At any point during a simulation, the user may add ‘nodal value flags’ within the model domain to display variable values in the model at for the current time step14. The variables include: • grid location (I,J,K) of the nearest node and the geological and computational layer • simulation time that has elapsed • simulated hydraulic head • hydraulic conductivity • recharge • layer top and bottom elevations • seepage velocity in the W-E direction (Vx), N-S direction (Vy), and vertical direction • solute concentration • soil type • land use/land cover To add nodal value flags, LM click on the ‘ViewResult’ button along the left-side of the MAGNET Modeling Environment (see Section 2.7), then select ‘Nodal Values’ from the pop-up menu. Then single LM click anywhere within the model domain to place a nodal value flag. The cursor will continue to place nodal value flags with single LM clicks within the model domain. 14 Add a nodal value flag to the model will automatically pause the simulation. 68 Once a flag is placed, hover the cursor over it and single LM click to view the variable values of the nearest node. An example is shown in Figure 5-10. Close the variable table for an individual flag by clicking on the grey ‘X’ in the right-hand corner of the table. To remove the flags and return the cursor to “normal” mode, LM click on the ‘ViewResult’ button, then select ‘NodalV Off’. Figure 5-10: Example of placing nodal value flags in the model domain, with a sample variable table shown for the flag in the upper right of the model domain. 5.4 Cross-sections As mentioned in subsection 5.1.2, a cross-section is automatically generated for visualizing vertical characteristics of the aquifer system. The location and extent of the cross-section, represented as a yellow polyline, can be adjust by hovering the mouse over any of the four vertices and click-dragging to the new desired location. To view the model results along the currently placed cross-section, LM click on the ‘ViewResult’ button along the left-side of the MAGNET Modeling Environment, then select ‘Display Charts’ from the pop-up menu. This launches five different charts: • Monitoring Wells plot (see Section 6.1) • Cross-section plot • Cross-section diagram (“Full Cross-section”) • Mass Balance Bar Chart (see Section 6.2) • 3D surface plot (see Section 5.5) Any of the charts can be moved by click-dragging the chart frame across the MDWA. Options available for modified plots can be accessed by clicking on the pair of red arrows at the bottom-left of the chart. 69 An example of charts generated when using the ‘Display Charts’ option in the ‘ViewResults’ pop=up menu is shown in Figure 5-11, with the example Cross-section plot and Cross-section diagram highlighted/enlarged for emphasis. The next two subsections discuss each charter in further detail. Figure 5-11: Example charts generated when using the ‘Display Charts’. An example Cross-section plot is shown in the top-right, and an example Cross-section diagram (Full cross-section) is shown in the bottom-right. 5.4.1 Cross-section Plots The Cross-section Plot is used to graphically depict variations of head, concentration, conductivity, aquifer top and bottom elevations, and/or seepage velocities (Vx and Vy) along the direction of the cross-section. The plot can be customized by accessing the plot option (expand the red arrows at the bottom-left of the chart – see above). Illustrative examples are shown in Figure 5-12. By default, results for head, top elevation and bottom elevation are shown for the top-most layer (Figure 5-12a). Use the radio boxes in the scroll menu to determine which variables to display in the Cross-section Plot. Check the radio box next to ‘Legend’ to add a plot legend on the right-side of the chart. Click on the arrows next to ‘Layer #=’ to change layers (if the ‘Show Single Layer:’ radio button is selected), or select the radio button next to ‘Show All Layers’ to include results for each model layer on the plot. After making all desired changes, click on the ‘ReDraw’ button to update the plot. Next >