< PreviousMGMT User’s Manual Version 1/28/2019 10:38 PM Figure 36: Cross-section visualization in MGMT modeling environment using the (‘by well points’) tool. Wells used in the cross-section are indicated by point markers Well shapefile must be visible in the Work Display Bedrock geology of Lower Peninsula shown in the Work Display Well feature selected in the table below is identified by a red arrow in the cross-section viewer Bedrock top DEM Lithology legend; can switch from material type to material class; can also customize the color scheme (see section Error! Reference source not found.) Adjust number of tick marks on vertical scale Adjust extent of vertical scale More options Red arrow shown in work display indicates the current (or last) position of the cursor in the cross-section viewer MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 37: Cross-section visualization in MGMT modeling environment using the (‘by a free polyline’) tool. Also shown is the Cross Section Options window (accessed by selecting the More options button; see Figure 36). 2.6.2 Integrated 3D Overlays Three-dimensional layer overlays allow for identifying patterns, interrelationships and connections between different environmental parameters, subsurface geology, landscape features, and human infrastructure (see Figure 38). In MGMT, even the simulated potentiometric surface can be overlaid in the 3D viewer. The powerful capability of using overlays for groundwater resource evaluation is demonstrated in detail in section Part 3 –Tutorial for Groundwater . In this section, an explanation of accessing the 3D visualization tool and setting tool options is provided. DEM and bedrock surfaces are always shown; other bedrock layers can be added by checking boxes All geology layers were checked and assigned different colors in Cross Section Options (see above-right) to show the deep structure of the bedrock formations along the cross-section Glacial land system bedrock top geology Distance along cross-section Control display of abbreviations for glacial land systems and bedrock top geology (see below) MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 38: Illustrative examples of integrated 3D overlays. To create a 3D visualization, navigate to the Model menu, select (‘Create 3D model’) using the LM button, or access the tool from the Button toolbar. The 3D model area must be delineated using the LM button; single-click to define the vertices of the polygon that will fine the model domain, then double-click the LM button to close the polygon at the final vertex location. This will launch the 3D Model Geologic modeling and multi-level water quality sampling: Arsenic concentrations up to 0.0010 mg/L MGMT User’s Manual Version 1/28/2019 10:38 PM Options window, which allows users to define the grid settings and DEM source, and view Model Info (model width and height in meters, coordinates of top extent of model, right extent of model, etc.). See Figure 39 for more details. Figure 39: Grid Properties tab in the 3D Model Options window. The Layer Information tab in the 3D model Options window allows users to select which layers to utilize in the 3D visualization. Many of the layers available in plan-view analysis are available for 3D visualizations, including wells with lithology information for visualizing the 3D structure of the glacial drift material. If the 3D model domain contains chemistry concentration data that have been created (see 2.2.3 Chemistry Concentration Data) or a 2D model of the potentiometric surface (see 2.5.1 Create a 2D model of the Potentiometric Surface), these layers become available for 3D visualization. There are two ways to set base heights for features in 3D visualizations: 1) draping features on a surface (e.g., DEM, water table, etc.); 2) using an expression or a constant value. Users may add a constant values to the base height of a layer to raise (or lower) it relative to other layers in the 3D viewer, or select from a list of pre-defined offsets (see Figure 40). MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 40: Layer Information tab in the 3D Model Options window. Select from pre-set perspectives in the 3D Viewer Choose the method for setting base height of the Choose from a pre-defined offset, or use Customize to add a constant value to the base height Multiplier for the z-attribute of the layer; default convers m to ft; can also convert ft to m MGMT User’s Manual Version 1/28/2019 10:38 PM After defining the grid properties and layer information, select ‘OK’ to create a 3D model. This launches the MGMT 3D viewer window, which displays the 3D model in the window Work Display, and also prover a Layer Viewer module for accessing/altering the 3D layers. An example is shown in Figure 41. The button toolbar shown in Figure 41provides screen navigation tools, tools for executing forward or backward particle tracking (if particle have already been added to the main Work Display of the MGMT modeling environment – see 2.5.6 Particle Tracking), create cross-sections (), or clip the 3D model using the Clip Stereogram () tool. Examples of creating a cross-section in the 3D viewer and clipping the 3D model domain are shown in Figure 43 and Figure 44, respectively. Figure 41: Example MGMT 3D Viewer window. MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 42: Layer properties window accessed in the 3D Viewer window. MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 43: Creating a cross-section in the MGMT 3D Viewer Draw cross-sections are drawn in plan view, just as is done in the MGMT Work Display The same options/settings apply for cross-sections created in the 3D Viewer as in the main Work Display Location of cross-section in 3D Viewer MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 44: Clipping the 3D model domain using the Clip Stereogram tool. To return to the original model, access the 3D Model Options, and check ‘Recovery original boundary’ in the Grid Properties tab. More examples of using the 3D modeling tool are presented in Part 3 –Tutorial for Groundwater . 2.7 Saving and Loading Map Files If an MGMT project needs to be saved for completion at a later time, users should select (‘Save model’) from the Button toolbar or from the File menu. This allows saving the MGMT project as an Create a polygon to delineate the region to keep after clipping the 3D model The display will refresh the new model domain MGMT User’s Manual Version 1/28/2019 10:38 PM ArcGIS ArcMap Document (*.mxd). All layer symbologies will be preserved, as well as the Layer Viewer configuration/settings and Work Display contents. Load a previously saved MGMT project by selecting (‘Open Map File’) from the Button toolbar or from the File menu. To start a new project using the default layers and settings, select (‘Create New Model’) from the Button toolbar or from the File menu. Note that a prompt will ask if the current map file should be saved; any unsaved work in the previous MGMT project will be lost. Part 3 –Tutorial for Groundwater Management and Protection The ability to use solely existing data to delineate groundwater flow patterns, establish WHPAs and groundwater source areas, and estimate drawdown due to pumping makes MGMT a unique tool for cost-effective groundwater management and protection in Michigan, particularly at the site-scale. Yet, the real power stems from the systematic integration of detailed groundwater-centric data with dynamic visualization, modeling, and analysis tools. This allows for a wide variety of investigative perspectives that naturally follow the progression of groundwater studies – from site characterization, to resource evaluation, protection and ultimately the sustainable management and protection of groundwater and drinking water supply. More succinctly, MGMT enables the user to gain a system perspective – one that identifies all of the different components of the systems and how they interact and relate with one another. In terms of groundwater resource management and protection, the following are important considerations: • What is the human footprint, e.g., how is population and water demand distributed? • Where are the important surface features, e.g., watershed boundaries, locations of streams and rivers, etc.? • How does the local bedrock geology contribute to/impact groundwater resources? • How are different geologic materials distributed in the glacial drift aquifer? How does this impact groundwater yield and recharge to the deeper aquifers? • What do the long-term average static water level distribution look like, both at the regional and local scales? Where are the recharge and discharge areas? • How does water quality vary across space and time? • What are the relationships between water quality and hydrogeology? • What is needed to protect and maintain safe drinking water supply? The remainder of this section is dedicated to illustrating the system-based approach for a county in the Lower Peninsula of Michigan - Ottawa County. Although the example is not completely exhaustive of the ways in which MGMT can be used to guide groundwater resource evaluation, it should prove a nice “springboard” for different projects around the state. 3.1 Characterizing the Landscape The primary motivation for the study of groundwater has been its importance as a human resource (Freeze 1979). Characterizing the distribution of human populations and their potential use of groundwater for municipal water supply, irrigation, domestic use, and/or industrial purposes is a therefore an important aspect of any large-scale groundwater study. Users of MGMT can view total populations derived from the 2000 census for an entire County feature, within a Township feature, or for a City layer feature (see Figure 45). The population per square mile is also provided in these layers, as well as the areal extent of Next >