Title decimals represents the number of decimal places used in the Output Time value displayed in the graph title. Selecting File/Preferences from the top menu bar of the Calibration Plots window opens the Calibration preferences window, as shown in the figure below. This feature allows the user to quickly identify the location of the wells, and to check the magnitude of error associated with the individual data points. To select the data points in the graph, please refer to "Display Settings" on page 503. In addition, the observation wells associated with the selected data point(s) will be highlighted in the map view in the main Visual MODFLOW window. This information is very useful in order to determine the vertical location of the observation points. Further, the data points in the Calibration Plots can be linked to the map view in the main Visual MODFLOW window. Observed Scatter Graph of the Observation Points selected in the Visual MODFLOW screen (see "Selecting Observation Points" on page 488).Īs shown in the following figure, the data points in the Calibration Plots are displayed according to the model layers where the observation wells are located. When the Calibration Plots window (shown below) is first opened, it will display a Calculated vs. The Calibration Plots window is the ‘Command Center’ for the four different types of Calibration Graphs. Observed values for the selected Observation Well(s), which are displayed with different symbol shapes and colors. The default Calibration Graph is a scatter plot of Calculated vs. Visual MODFLOW provides a comprehensive selection of model calibration analysis tools for evaluating, interpreting, and presenting the model calibration, including:Ĭalibration Graphs may be displayed in the Output section by selecting Graphs/Calibration from the top menu bar, and choosing either Head or Concentration. However, there are some generally accepted methods of evaluating and interpreting the model calibration using both qualitative and quantitative measures. The acceptability of a model’s calibration is usually a subjective measure, as each model has different objectives, and must be calibrated to different conditions. Model calibration is the most critical process in building the groundwater flow and contaminant transport model, because the quality of the calibration inevitably determines the reliability of any conclusions and recommendations made using the simulation results. Model calibration is the process whereby selected model input parameters are adjusted within reasonable limits to produce simulation results that best match the known or measured values. Visual MODFLOW displays four different types of graphs:Įach of these graph types, and their associated display options, are presented in the following sections.
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