IGW-Desktop Tutorial 10 - Data-enabled "one-click" groundwater modeling

This video illustrates the use of IGW-Desktop to create a data-enabled model for the Kalamazoo River watershed in the State of Michigan. This model uses detailed existing datasets, such as Digital Elevation Models, bedrock elevation rasters, and hydraulic conductivity rasters from a massive statewide well database. The source of water to this model is the statewide groundwater recharge raster, and the sink in this model is the land surface, which acts as a drain. This model is generated with just “one click” and therefore, uses pre-selected datasets by default. This preliminary model provides a powerful and useful framework which can be easily modified and improved upon by the user. To evaluate the model’s performance, the model’s predictions are compared to static water levels from the statewide wells database. The steps to create the model are outlined briefly: (1) Launch the GIS/Google Map interface (2) In the window that appears, click the ‘Toggle between Google Map and GIS’ icon to bring up the GIS interface (3) Click on the ‘Add new modeling layer’ icon to load the watershed boundary. Browse to the folder where the Michigan watershed boundaries are stored: C:\MGMTLocalData\StateLT\Watershed Load the ‘WSH_BIG’ shapefile. T (4) Zoom in to the Kalamazoo River watershed (5) Select the WSH_BIG shapefile under ‘Polygon Layers’ in the GIS Layer Explorer, then click the ‘Draw a selection box’ icon. Draw a small box within the Kalamazoo River watershed, and the entire watershed will be filled with red to indicate it is the selected polygon (6) Click on the ‘Data enabled modeling…’ icon to create a preliminary model. A prompt will appear to clarify the datasets and key model features used to create the preliminary model. Select ‘Yes’ to proceed (7) Automatically, the watershed boundaries and data will be imported to IGW, and the workspace extent is determined by the watershed area. (8) Discretize the model using a slightly finer grid than would be provided with the default settings (9) Edit the head display options. Enable zoned (color filled) head display. (10) Run the model (11) Select the domain polygon in Attributes Explorer, and then return to the GIS interface. Click on the ‘Add new modeling layer’ icon to add wells from the statewide database. Proceed to C:\MGMTLocalData\StateLT\Categories\ to load the ‘Drift’ shapefile, which includes all recorded drift wells in Michigan (12) Select the WSH_BIG shapefile under ‘Polygon Layers’ in the GIS Layer Explorer, click om the ‘Draw a selection box’ icon, then click within the watershed boundary. This de-selects the watershed polygon. Then, click once more within the Kalamazoo River watershed boundary, and answer ‘Yes’ to the prompt that appears. This selects both the watershed and all of the drift wells within the watershed. (13) Click on the ‘Data Explore’ icon to import static water levels (SWL) from the drift wells selected in the previous step. Ensure that SWL_Elev is the selected parameter and that ‘From GIS Importer’ is selected, then click ‘Import’ (14) After importing the SWL, leave the ‘Spatial Analysis’ window open and go to ‘Utilities’ - ‘Data Sampling’ - ‘Show Model vs. Obs Sampling at Wellogic SWL from GIS Importer’, then select ‘Averaging in a layer’. The different options for comparing SWL measurements and simulated head are available when dealing with multiple layers in the vertical direction (15) A calibration plot showing the simulated head vs. the measured SWL will appear. Note the general agreement between simulated and observed heads displayed in the plot. Also note that the RMS Error, Mean error and Nash-Sutcliffe coefficient are displayed below the plot. • Check the ‘Add confidence interval(CI)’ to show a 1 standard deviation line plotted above and below the line of perfect agreement between simulated and observed data. The confidence interval can be witch to display a 2 standard deviation line or a line based on a user-defined multiplicative factor of the standard deviation. • The user can also add a band-mean to the plot More details on IGW: please go to https://www.magnet4water.net/GW_home.aspx - Hydrosimulatics Inc. https://www.magnet4water.net