Tutorial

Univ. Of Washington

Sujets

• Tutoriel
• Ischnomera
• Modelica
• Contournement de La Roche-sur-Yon
• Uniforme militaire
• Géographie de la Russie

Informations

• Publié par: Octi
• Nombre de lectures: 281
• Langue: English

Extrait

Chapter 2 - Tutorial CHAPTER 2 Tutorial This tutorial will guide you through the basic steps to develop a project using ISC- AERMOD View. This tutorial assumes that you have some familiarity with air dispersion modeling. Contents The Problem Creating the Tutorial Project Working on the Control Pathway Worhe Source Pathway Working on the Receptor Pathway Worhe Meteorology Pathway Working on the Output Pathway Running the three U.S. EPA models Post-Processing of Results with POST View The Problem XYZ Company wants to obtain a permit to operate a chemical plant in a rural area. The effluent from the facility (SO ) is released to the atmosphere through two stacks. A 2 building is located close to the stacks. Parameters for the two sources are described in Table 8A-1 below. Please note that this is only a description of the problem. DO NOT START the tutorial project yet. Table 2-1. Source Parameters Parameter STACK1 STACK2 X Coordinate 439245.00 439118.00 Y Coordinate 5298405.00 5298262. Base Elevation (m) 0.0 0.0 Release Height above Ground (m) 60.0 60.0 Emission Rate (g/s) 1.0 1.0 Stack Gas Exit Temperature (K) 400.0 450.0 Stack Gas Exit Velocity (m/s) 5.0 5.0 ISC-AERMOD View • Lakes Environmental Software 2-1Chapter 2 - Tutorial Parameter STACK1 STACK2 Stack Inside Diameter (m) 2.0 2.0 We will model the impact from the chemical plant emissions to the atmosphere to determine if they produce a significant impact for SO and to get an idea of the impacted 2 area. We will perform the air quality impact evaluation using three U.S. EPA models: ISCST3, AERMOD, and ISC-PRIME. This ISC-AERMOD View tutorial requires files produced by the BPIP View, Aermet View, and Rammet View tutorials. It is advisable that you complete these tutorials before starting the ISC-AERMOD View tutorial. The following files will be used by ISC-AERMOD View: TUTORIAL.MET: Meteorological data file preprocessed by Rammet View. TUTORIAL.SFC and TUTORIAL.PFL: Meteorological data files preprocessed by Aermet View. TUTORIAL.BPO: Building downwash file output by BPIP. Bush file output by BPIP-PRIME. TUTORIAL.PRO: Creating the Tutorial Project How to Create the Tutorial Project: Step 1: From the Windows Start menu, choose Programs > Lakes Environmental > ISC-AERMOD View or double-click on the ISC- AERMOD View icon if you have created a shortcut on the desktop. Step 2: The About dialog box appears on the screen. Click the OK button and the ISC-AERMOD View initial window is displayed. Step 3: Select File | New Project... from the menu. The New Project dialog box is displayed. Step 4: Select the Directory and Drive and enter the File Name for the tutorial project and click the OK button. Note: If you only want to browse this tutorial, we have included the tutorial project file, TUTORIAL.ISC, in the installation directory (by default C:\ISCVIEW3\TUTORIAL). ISC-AERMOD View • Lakes Environmental Software2-2 Chapter 2 - Tutorial Working on the Control Pathway After a few seconds the first ISC-AERMOD View window appears, the CO-Dispersion Options window. This window is part of the Control Pathway. After we start inputting data there are some indicators to help you identify which model, window, and pathway you are in when navigating from one window to the other. The clues are the following: From the menu select Model and then select the model you want to work with (ISCST3, AERMOD, or ISC-PRIME). The button, located on the lower right hand side of the window that identifies the name of the current window will be disabled (grayed). You may find a few buttons that are also disabled in addition to the button for the current window. In such case, these buttons are disabled because they are not applicable to you current project. The Pathway Identification panel located on the upper right hand side of each window contains the icon and the name that identifies the pathway for the current window. Pathway Identification panel For this tutorial, we will input data into the five (5) pathways in the following sequence: Control Pathway, Source Pathway, Receptor Pathway, Meteorology Pathway, and ISC-AERMOD View • Lakes Environmental Software 2-3Chapter 2 - Tutorial Output Pathway. Using the information from the Table 2-1, we can start inputting data into our project. CO-Dipersion Options Window Titles: The top field is for input of the first line of title and accepts up to 68 characters (including blanks). The bottom field is for an optional second line of title of the same length. Step 5: Type in on the top field the following title: XYZ Company - Concentration Calculation - 1988 Met Data Regulatory Default: this option is the default for regulatory applications. Step 6: Select the Regulatory Default option. Output Types: ISCST3 and ISC-PRIME can handle concentration and deposition calculations. AERMOD, at the present time, can only handle concentration calculations. Step 7: Select Concentration for Output Types. Dispersion Coefficient: Either Rural or Urban dispersion coefficient can be selected, depending on the characteristics of site. Step 8: Select Rural for the Dispersion Coefficient. ISC-AERMOD View • Lakes Environmental Software2-4 Chapter 2 - Tutorial Step 9: Now, change the model by selecting Model | AERMOD from the menu. Note that the CO-Dispersion Options window changes. Note also that some of the data we input in ISC mode is also shown here. In AERMOD, for instance, rural dispersion option is used in the calculations unless user selects the Urban Dispersion Option. Step 10: Verify the ISC-PRIME data for this window by selecting Model | ISC-PRIME from the menu. From now on, we will only change models if the data input for any of the models is different. CO-Dispersion Options window Step 11: Now that you have finished the data input in the CO-Dispersion Options window, press the Next button or the Pollutant/Avg Time/... button to go to the CO-Pollutant/Avg Time/... window. ISC-AERMOD View • Lakes Environmental Software 2-5Chapter 2 - Tutorial CO-Pollutant/Avg Time/... Window Step 12: The Pollutant Type list box already shows SO as the pollutant to be modeled. 2 Leave the Exponential Decay option as No (default) since we are not going to specify half life or decay coefficient for SO .2 Step 13: Select the 3 Hours 24 Hours, and PERIOD check boxes as Averaging Time , Options. Step 14: Leave the default options: Terrain Height Options: Flat Terrain Calculation Algorithms: Simple + Complex Terrain Flagpole Receptors: No. ISC-AERMOD View • Lakes Environmental Software2-6 Chapter 2 - Tutorial Step 15: You have finished the data input on the CO-Pollutant/Avg Time/... window. From here you could go to the next pathway, the Source Pathway. However, to make you more familiar with the windows we will just take a look into our next window in the Control Pathway. For this, press the Next button or the Optional Files button. CO-Pollutant/Avg Time/... window CO-Optional Files Window The CO-Optional Files window has the flexibility of storing information for use in later runs. By simply checking or unchecking the boxes in the Optional Files frame, you define if the file already specified for these options will be generated in the current run. Click one or more of these check boxes to see what happens with these frames. You can input data in any one of these frames, but for this run, do not forget to clear all checked boxes in the Optional Files frame. Now it is time for the next step, the Source Pathway. Press the Next button or the Source button on the menu toolbar. ISC-AERMOD View • Lakes Environmental Software 2-7Chapter 2 - Tutorial CO-Optional Files window Working on the Source Pathway The first window that appears after you click the toolbar button is the Source SO-Source Inputs window. In this window, you define the source or sources being modeled. Using the information from Table 2-1, follow the steps below: SO-Sources Summary window ISC-AERMOD View • Lakes Environmental Software2-8 Chapter 2 - Tutorial SO-Source Inputs Window or Graphical Input Window You can input the source information in the following ways: In the Source Inputs dialog box (text mode), In the Graphical Input window (graphical mode) Importing from your BPIP View project (importing mode) If you followed the BPIP View tutorial, and your BPIP View tutorial project has the same name and is located in the same directory as your ISC-AERMOD View project, then you will see that all the stacks you have defined in BPIP View are available in ISC- AERMOD View. Step 16: Press the Source button to go to the Source Pathway. The SO - Source Inputs window is displayed. Note that the two stacks you defined in BPIP View also appear here. Source button Step 17: Press the View/Edit Source button to display the Source Inputs dialog box. From this dialog, you can check all the parameters for each source. Step 18: To see your sources in graphical mode, press the View menu toolbar button. Note that the site maps and the stacks you defined in BPIP View are displayed on the drawing area of the Graphical Input window. View button ISC-AERMOD View • Lakes Environmental Software 2-9Chapter 2 - Tutorial Step 19: You may need to adjust the domain size. Press the Domain tool ( ) to display the Domain Setup dialog box. Zoom in the area around the red box. The red box marks the current domain area. Click on the Choose Extents tool ( ) and draw a rectangle where you want the new domain to be. The selected domain extents are written into the Domain Notebook. See below the approximate coordinates and dimensions for the selected domain: SW Corner: 438000.0 and 5297000.0 (for X and Y UTM Coordinates) X Length: 2500 meters Yh: eters Domain Setup dialog box Graphical Input window ISC-AERMOD View • Lakes Environmental Software2-10