< PreviousMGMT User’s Manual Version 1/28/2019 10:38 PM Once the area for extraction is defined, the Chemistry options window will appear (see Figure 11). Select a category from the top-left drop-down menu, then choose an entry from the list of available elements/compounds in the next drop-down menu. The concentration data are loaded and displayed in the table, and can be organized according to different criteria available under the ‘Statistics’ box. The concentration dataset can be filtered for a distinct time period or for a range of prescribed values. A constant depth can be assigned if the concentration data are to be used in 3D visualizations (see section 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. 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. MGMT User’s Manual Version 1/28/2019 10:38 PM 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 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 Figure 11: Adding chemistry concentration data to an MGMT project: (top) Chemistry window that is launched after selecting an area for data extraction; (bottom) MGMT modeling environment after chemistry concentration data are added. 2.2.4 Layer Properties Layer Properties can be accessed for any layer/user data by using the RM button and choosing ‘Properties’ from the pop-up menu. For most of the layers, four tabs are available in the Layer Properties window: General; Symbology; Label; and Display. In the General tab, the user may alter the Layer Name and Class, apply scale-dependent control settings, and set the data source file and pathname. Spatial Concentration data layer will automatically be grouped under Chemical Sampling in the Layer Viewer Filter dataset for a time period or a range of values Organize the dataset or compute average/sum for sites with multiple samples MGMT User’s Manual Version 1/28/2019 10:38 PM reference and layer information is also shown in the General tab. See Figure 12 for more details. Edit layer name In beyond refers to the largest desired visible map scale, which is the smaller of the map scale numbers (the maximum scale). Out beyond refers to the smallest desired map scale at which the layer is visible in the display (the minimum scale). This will use the larger of the map scale numbers. Set data source file and pathname Edit layer name In beyond refers to the largest desired visible map scale, which is the smaller of the map scale numbers (the maximum scale). Out beyond refers to the smallest desired map scale at which the layer is visible in the display (the minimum scale). This will use the larger of the map scale numbers. Set data source file and pathname MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 12: Options available in the General tab of Layer Properties The Symbology tab allows users to customize the appearance of data layers in the Work space. It will appear different depending on the type of data being used (point, polygon/polyline, or raster). Point and polygon/polyline may utilize the following symbol types: • Single Symbol – all features in a layer share the same symbol/color; • Unique Values – different values within a field are displayed using unique colors; • Quantify Classify – values within a field are subdivided into separate Classes, and each class is assigned a different color • Quantify Category – similar to Quantify Classify, but a values from a secondary field to display a layer using a field to map by category and a quantity field (e.g., you could use line colors to represent road types and use line width to indicate traffic volume along each road) Raster and image files may utilize the following symbol types in MGMT: • Stretched Color – Similar to Quantify Classify, but values are assigned a color by use of a continuous color ramp across the range of field values • Quantify Classify - values within a field are subdivided into separate Classes, and each class is assigned a different color Examples of the Symbology tab and Symbol Type options are shown in Figure 13. The Label tab of the Layer Properties window allows the user to customize the appearance of labels associated with point and polygon/polyline data layers in the Work Display. Users may select field to use for labeling, set scale-dependent label visibility options, adjust label placement, and customize the text symbol (font & color). See Figure 14 for more details. Edit layer name In beyond refers to the largest desired visible map scale, which is the smaller of the map scale numbers (the maximum scale). Out beyond refers to the smallest desired map scale at which the layer is visible in the display (the minimum scale). This will use the larger of the map scale numbers. Set data source file and pathname MGMT User’s Manual Version 1/28/2019 10:38 PM The Display tab of the Layer Properties window allows the user to customize the layer decoration (field to use for map display; layer transparency) field scale-dependency (map reference scale), and feature selection capabilities (i.e., select all features within a field that satisfy a logical criterion established by the user). Figure 13: Symbology tab options in the Layer Properties window. (Top left) using Unique Value to color lakes based on unique names; (top right) using a single symbol to represent wells in a well layer; (bottom left) using Stretched Color to symbolize a raster layer; (bottom right): using Quantify Classify to display values stored in a raster layer. Invert Color Ramp by checking Invert Customize the Color Ramp by clicking on it MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 14: Label tab of the Layer Properties window for polygon (top), polyline (middle), and point layers (bottom). In beyond refers to the largest desired visible map scale, which is the smaller of the map scale numbers (the maximum scale). Out beyond refers to the smallest desired map scale at which the layer is visible in the display (the minimum scale) Note that label placement options are different for polygon (top), polylines (middle), and point layers (bottom) MGMT User’s Manual Version 1/28/2019 10:38 PM 2.2.5 Attributes Table Layer attributes can be viewed for point, polygon/polylines, and DEM by using the RM button and choosing ‘Attributes’. Different types of data (fields) are stored in different columns, and different rows store information for different features. A limit of 1000 records are shown on one page, but the user may browse forward or specify a page to access. An example of an Attributes window is shown in Figure 15. 2.2.6 Data Diagram The Data Diagram tool is an interface for simple statistical analysis of values stored in a field of a point, polyline, or polygon layer. It can be accessed by selecting a layer using the RM button and choosing ‘Data Diagram’. Once a field is selected, statistics will automatically be computed and a histogram will be displayed with a default of 100 bins. The lower and upper bounds of the dataset are automatically detected but may be adjusted by the user. The user may also adjust the number of samples used in the statistical analysis. If sample size is reduced, records are removed randomly from the subset of data. Figure 16 provides four examples of using the Data Diagram tool for statistical analysis in MGMT. Figure 15: Attributes window for State Road layer in MGMT. Next >