The BPIP GEP Max analysis mode is used to display the single-tier or tier-group, with it's corresponding GEP-SIZ and Wind Direction, that produces the maximum GEP height for a Selected Stack.
| • | Select the mode by clicking on "BPIP GEP Max - Select Stack" in the Mode List. |
| • | Select a stack by either clicking on it's name in the Stack List or directly clicking on the 3D stack with the left mouse button. Notice how the Wind Direction Arrow appears pointing out from the Stack Top. This is the direction that produces the Maximum GEP Height for the Selected Stack. |
| • | Center the stack in the view by positioning the cursor on the stack and clicking the right mouse button. Rotate the view by clicking down with the left mouse button and dragging the mouse left/right and up/down. |
| • | Notice what is displayed after selecting a stack: |
| 1. | The single-tier or tier-group that produces the Maxim GEP Height will be highlighted with a combination of three colors: blue, orange, and yellow. A single-tier will be blue. A tier-group will have a Focal Tier colored blue, a Common Height Tier colored orange, and additional Other Tiers colored yellow. If a tier-group has only a single blue tier with one or more yellow tiers then the Focal Tier is also the Common Height Tier. |
| 2. | The associated GEP-SIZ will be displayed in either yellow or blue. Blue if the GEP-SIZ is for a single-tier and yellow if the GEP-SIZ is for a tier-group. Notice that the width of the GEP-SIZ is exactly equal to the profile width of the influencing structure (i.e. the single-tier or tier-group). Notice that the length of the GEP-SIZ extends '5L' (where 'L' is the lesser of the influencing structures height or width) past the downwind boundary of the influencing structure. |
| 3. | The computed Maximum GEP Height will be displayed as a red cylinder on top of the Selected Stack cylinder. If the Maximum GEP Height is higher than the Selected Stack, then the stack is too short and will be subjected to downwash effects in the wake of the influencing structure. If the Selected Stack is higher than the Maximum GEP Height, then the stack emissions will be above the influence (i.e. outside the turbulent wake) of the influencing structure. |
| 4. | Notice how the tiers in a tier-group might have moved up or down vertically to align their bases with the Focal Tier. This is necessary to demonstrate that BPIP does not use tier elevation values when combining tiers into groups. All tiers are assumed to have the same base elevation as the Focal Tier. |
| 5. | Notice that the height of the GEP-SIZ block is always equal to the height of the Common Height Tier and that the GEP Height will be "1.5 times the lesser of the GEP-SIZs height or width" above the top of the GEP-SIZ block. This is, in fact, how GEP height is calculated. |
| • | To automatically rotate the view direction hit the "Z" key. Hit the 'Z' key again to stop the Automatic Rotation Mode. Notice that you can perform all other interactions while in Automatic Rotation Mode. Right mouse click on other objects to reset the center of rotation. Pan the scene by clicking down with the middle mouse button and dragging left/right and up/down. Select another stack by clicking on another stack in the view, or clicking on another stack in the Stack List. Even change the analysis mode by clicking on another selection in the Analysis Mode List. |
| • | Use the Display Menu, or Toolbar Buttons to toggle between the 3D and 2D top-down views. Notice in the top-down view how perspective distortion is removed making it easy to see the GEP-SIZ boundaries. Also, use the Display Menu or Toolbar Buttons to toggle the Axes and Grid display On/Off, and to Reset View (i.e. center the entire scene into view). |
Page url:
http://www.breeze-software.com/prod/aermod-isc/help/index.html?gep_max___select_stack.htm
