< PreviousMGMT User’s Manual Version 1/28/2019 10:38 PM 2.5.3 Raster Calculator A model raster layer can be used to generate a new raster layer using the Raster Calculator (), available in the Model menu or in the Button toolbar. At least one model must be present in the MGMT modeling environment, then select using the LM button. This will launch the Raster Calculator window, which allows the user to select the base layer from a model group, script the mathematical operations to perform on the base layer, save or load a script, and customize the output dataset name and color map. See Figure 28 for more details. Figure 28: Creating a new raster layer from an existing model layer using the Raster Calculator. You must first create the model layer before using the Click on the mathematical operators to include them in the raster culati Select from available data layers in the active model Assign a layer name for the output raster; determine levels used for displaying output color map; generate contour layer Develop script for raster calculation Scripts can be saved or loaded Newly created raster layer representing ln(K), where K is hydraulic conductivity The new dataset is added as a layer under the active model group MGMT User’s Manual Version 1/28/2019 10:38 PM 2.5.4 Model Management Model Settings - Options for a 2D model can be adjusted by selecting (‘Active model properties’) from the Model menu. (This tool is also accessible in the Button toolbar). Create Multiple Models – It is possible to create multiple models or raster polygons (see. Use (‘by a Polygon’) or (‘by Feature’) to create the new model domain. Change the Model name to something new to avoid overwriting the original or previously created model. Active and Inactive Models – Only one model may be active at once, i.e., model settings can be adjusted, particle tracking can be applied, etc. The newest model is assigned as active, but this can be changed in two ways: 1) select (‘Model Management) from the Model Menu or from the Button toolbar using the LM button, and then click the RM button anywhere in an inactive model and select ‘Active’; 2) select the small arrow to the right of , select ‘Load inactive model’, then select the model to make active from the list. See Figure 29 for more details. Delete a Model – A model must be active in order to be deleted. Select from the Model Menu or from the Button toolbar using the LM button, and then click the RM button anywhere in an active model and select ‘Delete’. Figure 29: Multiple 2D models of the potentiometric surface created in the MGMT modeling environment. 2.5.5 Drawdown Operations To model drawdown due to pumping from groundwater wells, navigate to ‘Place drawdown site’ in the Model menu, or select (‘Drawdown Operation’) from the Button toolbar. This will launch a Model Options window with two Drawdown subtab: Drawdown List and Place drawdown at wells. The cursor will also been shown as a crosshair. Click anywhere in the model domain to place a well. Each time a well is added, a corresponding entry is added to the Drawdown list. Select any individual entry from the Drawdown list to update the Drawdown Properties and Drawdown Symbol for that particular well. The longitude and latitude can be updated for an individual well, but if Each model has its sublayers grouped under the model name assigned in model options Active model is highlighted with a red border MGMT User’s Manual Version 1/28/2019 10:38 PM multiple wells are selected, the location cannot be altered, and any changes to other Drawdown Properties or to the Drawdown Symbol will be applied to all selected wells. Use the LM to select ‘Apply’ to implement the drawdown operation(s) into the groundwater flow model (see Figure 30). Figure 30: Using the Drawdown Operation tool in MGMT. 2.5.6 Particle Tracking Once a 2D model of the potentiometric surface is created, the user can interactively place a single particle or a group of particles at different locations in the Work Display, and then visualize advective contaminant transport by running the model forward or backward in time. To place a particle, navigate to the place particle submenu housed in the Particle menu. There are several options for placing particles, which are summarized in Table 1. Each of those tools are also available as buttons in the Button toolbars. In all cases, the user may choose to display the particle path during simulation by checking the box next to ‘Display Particle Path’. Particle settings are located in the Attributes and Options (AO) pane to the right of the Work Display, unless one of the feature base particle tools is be used, which will instead launch a pop-up window for selecting features and choosing particle settings (see Figure 31). Active cell is highlighted in the Work Display Withdrawals are associated with negative pumping values; injections are associated with positive pumping values Values of the stressed potentiometric surface level and drawdown will be reported for the cursor location in the model domain Location displayed in State projection system coordinates Thickness, B, is calculated based on the DEM and bedrock top elevation MGMT User’s Manual Version 1/28/2019 10:38 PM Table 1: Tools for placing particles in the model domain Single particle Point base particle Polyline base particle Polygon base particle Point feature base particle Polyline feature base particle Polygon feature base particle Tool Button Name Details Place a single particle at one location; particle size & color may be customized Place particles around a point; number of particles, particle size, starting location and buffer distance from the point may be customized Sketch a polyline and place particles along it (constant density); number of particles, particle size & color, and starting location may be customized Sketch a polygon and place particles within it or along the polygon boundary (constant density); number of particles, particle size & color, and starting location may be customized Place particles at existing public supply well locations (Type I or Type II drift/bedrock water well) within the model domain; select wells for analysis and settings in pop-up windows; starting location, and particle size & color may be customized Place particles at existing polyline features (streams and roads) within the model domain; select features for analysis and settings in pop-up windows; starting location, number of particles, and particle size & color may be customized Place particles within or along the boundary of existing polyline features (lakes, city boundaries, etc.) within the model domain; select features for analysis and settings in pop-up windows; starting location, number of particles, and particle size & color may be customized MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 31: Examples of placing particles in a model in the Work Display and available settings. Select all features in a feature class, or use a sub-Check this box to display the particle(s) paths during simulation Different configurations for locating particles around the feature Particle settings for manually placed particles appear to the right of the Work Display MGMT User’s Manual Version 1/28/2019 10:38 PM Once all particles have been placed in the model domain, use the ‘Particle Tracking’ submenu or the Button Toolbar to run the model forward () or backward (). At any point the, the simulation may be paused or the particle(s) may be reset to their original position using the (‘Stop’) button. Use the (‘TimeClock’) tool to set the particle tracking simulation time-step and duration. To remove all of the particles from the model, select the (‘Remove all particles’) tool, then refresh the Work display using the (‘Refresh’) tool. Once particle(s) and/or particle groups have been placed within the model, users may adjust particle settings at any point by selecting (‘Set Model Options’) from the Button toolbar or by navigating to update any particle feature(s), or apply global settings to all particle features (see Figure 32). Figure 32: Particle tab in the Model Options window. 2.5.7 Delineate Wellhead Protection Area (WHPA) Because a primary purpose of particle tracking is to delineate wellhead protection areas (WHPAs) – the area contributing groundwater to a public water-supply system (PWSS) well within a 10 year time-of-travel period – a tool for direct WHPA delineation is available in MGMT. This tool may also be used for delineating groundwater source areas to lakes, wetlands, or any other features of interest. To use the WHPA delineation tool, first create a 2D model of the potentiometric surface, then execute a backward particle simulation for the location of interest. Figure 33 provides an example of particle initialization and the 10-year result of backward particle tracking. After the simulation is complete, select (‘Delineate WHPA) from the Button toolbar or from the Particle menu. This activates the WHPA Delineation options in the AO pane, which allows users to choose the method of WHPA delineation and any of their available options, set the output file destination, and execute the tool. Four methods are available for WHPA delineation: 1) ConvexHll, which fits a tight envelop around the path lines; 2) PathBuffer, which also fits an envelope around the path lines, but applies a buffer distance around the exterior path lines; 3) FillGridCells use all grid cells from the 2D model that are intersected by path lines to delineate the WHPA; and 4) Manual, which allows the users to freely sketch a polygon around the particle paths. The different methods are illustrated in Figure 33,Figure 34, and Figure 36. If applying global updates (all boxes are checked), particle properties may not be updated MGMT User’s Manual Version 1/28/2019 10:38 PM Note that using automatically creating a shapefile in the destination file location, but a prompt will also appear to save the particle pathlines. Answer ‘yes’ to this prompt to save and display the particle path lines as polylines, as was done in in Figure 33 andFigure 34. Figure 33: Delineating WHPAs in the MGMT modeling environment: (top-left): initial particle positions (within a lake, around a Type II bedrock well, and along the shoreline of another lake); (top-right): final particle positions after 10 years, with path lines shown; (bottom): WHPA delineated for the Type II well using the ConvexHull method. WHPA shapefile can be added to the WHPAS group layer Particle path lines can be saved as polylines; PTKPATHLINES group layer automatically created Select method of WHPA delineation from drop-down menu; ConvexHull fits a tight envelop around the path lines Set the output file destination Execute WHPA delineation and store in file destination Particle positions and path lines after 10 years of backward particle tracking Particles placed along part of a lake shoreline Particles placed around a Type II bedrock well Particles placed within a lake MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 34: 10-year groundwater source areas delineated for the particle initializations shown in Figure 33: (top) using the PathBuffer method to delineate the groundwater source area for a lake shoreline; (bottom) using FillGridCell to delineate the groundwater source area for an entire lake. PathBuffer also fits an envelop around the path lines, but applies a buffer distance around the exterior path lines. Prescribe a buffer distance; set units by single-clicking small options box to the right of the text box ( ) FillGridCell uses all grid cells (from the 2D model) that are intersected by path lines to delineate the WHPA Apply a buffer distance to include more grid cells around the exterior path lines MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 35: Using the Manual method to delineate a groundwater source area for a lake. 2.6 Advanced Visualizations All of the tools and capabilities of MGMT reviewed thus far are utilized in the plan-view orientation of the Work Display. To aid in the understanding of three-dimensional (3D) structure of subsurface environment, users of MGMT may create vertical cross-sections of the subsurface and develop fully-3D visualizations of the landscape and its integrated features (human and natural). 2.6.1 Cross-sections Cross-sections are useful for examining variations in the topography, visualizing the lithology of boreholes, and delineating geologic boundaries between major bedrock formations. Use the polygon feature from the Sketch menu that appears to delineate the groundwater source area/WHPA. Then use the arrow tool to select the polygon, right-click, and select ‘Convert to shape file’ MGMT User’s Manual Version 1/28/2019 10:38 PM Prescribing the path of a cross-section across the Work Display and viewing the results can be done with two different tools: 1) (‘by well points’), which allows users to select wells visible in the Work Display to delineate the path of the cross-section; 2) (‘by a free polyline’), which allows users to track a polyline across the Work Display to delineate the path of the cross-section. Both tools are available in the Button toolbar and in the CrossSection menu. A single-click on the LM button selects a well (or sets the location of a vertex), while a double-click finishes drawing the cross-section and launches the Cross Section window display. Examples of using both cross-section tools are shown in Figure 36 and Figure 37, which include details on the cross-section viewer interface and available options. Next >