|
|
|
|
|
Running a Short-Term Fire Behavior (STFB) Analysis
Fire Behavior Specialists can run the Short Term Fire Behavior model. This version allows the analyst to modify many input parameters, unlike the automated version, which is available to dispatchers, authors, editors, and incident owners, and doesn't allow for much parameter input modification. The following parameters can be modified when running Short Term Fire Behavior:
- Conditioning information
- Burn periods and number of periods
- Foliar Moisture Content
- Crown Fire Method
- Spotting Probability
- Spotting Seed
- Analysis shapefiles
- Spread Options
- RAWS Information
- Wind Information
- Initial Fuel Moisture
- Hourly Weather Record
- Landscape File Settings (Draw a Landscape Extent, Create a Landscape File, Modify Landscape Parameters)
- Landscape File Editor (Create or Import editor rules for landscape edits)
When making changes to these parameters, use the Save button to save your selections.
Fire Behavior Requester Reminder details information you can provide to the Analyst that improves the run results.
CAUTION: Changing the analysis date, RAWS station, or burn period information, automatically repopulates the hourly records and overwrites your changes.
To run a STFB:
- From the Incident list, select the incident for which you want to run a STFB.
- Click View Analyses. The Analysis List appears for the selected incident.
- Under New Analysis, select Short-Term, then click Create Analysis for Incident. The New Short-Term Analysis page appears.
- Enter an Analysis Name. The analysis name cannot contain an apostrophe or backslash; the cursor blinks if you try to add these characters and a message displays that these characters are disabled.
Since incidents can have many analyses associated with them, be specific in your name (up to 48 characters). For example, "RedValley STFB 06152009 1300 jdoe" would be the Red Valley fire, STFB run on June 15, 2009 at 1 pm by John Doe.
- Set the date and hours. (The Hour field is the time at which fuels conditioning will stop.)
- For dates in the future, WFDSS uses forecast data.
- For dates in the past, WFDSS uses historic RAWS data.
- Set the conditioning days. Five days is usually adequate since only 1-, 10-, and 100-hour timelag fuels are conditioned.
- Set the burn period (hours per period) and number of periods.
- Set the foliar moisture content and select a crown fire method.
- The default foliar moisture is usually adequate for an average fire season, but you might want to change it during a drought or if an insect/disease episode is occurring.
- For recent versions of Landfire (2010, 2014) the canopy fuel values for CBD were computed to produce more active crown fire when using the Scott and Reinhardt compared to the Finney crown fire model. You would expect to see slower ROS and less fire intensity for predicted passive crown fire when using Finney versus Scott and Reinhardt crown fire models. However, the final selection of a crown fire model should be based on calibration to observed fire behavior.
- Set the spotting probability. There is generally no need to change the Spotting Seed.
- Upload ignition and barriers shapefiles.
- Set the spread options in degrees (to simulate backing, flanking, or head fire).
- Verify the RAWS information.
- Click Create. The Detailed Short-Term Fire Behavior page appears.
- Verify the following items:
- Create a landscape file and edit it if necessary. (See Creating the Landscape File and Editing a Landscape File.)
- Use the requirements fly-out menu on the right to ensure all required components are completed.
- Click Run Short-Term Fire Behavior. The analysis runs.
Depending on the landscape size and resolution, as well as the traffic on the server, the analysis could take several minutes to run. Refresh your browser to see the status change to Complete, then select the analysis and click View Results to see the analysis results on the map view.
-----------
Last updated on 8/7/2023 3:16:43 PM.
In This Section |
See Also |
Reference |