Rapid Risk Assessment

The following tutorial demonstrates basic functions of the RRA, with more detailed guidance provided in the User Manual. Note that, in terms of computational expense, for each scenario executed within this web environment, this high-fidelity deterministic analysis of the hazard can be completed in 45 seconds (15 seconds for calculation and 30 seconds for generation of output files for visualization) and the full probabilistic assessment in 2 minutes (30 seconds for calculation and 90 seconds for generation of the output files for visualization).  

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  1. The Calculation Input widget is used to select the target coastal region and input the storm characteristics, using either the manual entry of the numeric values of the parameters in the text fields or through the use of interactive input tools that allow users to specify landfall location and angle graphically (hurricane location indicators). Slider bars allow users to adjust forward speed, central pressure and radius of max winds (hurricane intensity indicators).
  2. User specifies the time to landfall (defining current location of storm and the uncertainty associated with the median hurricane characteristics for this scenario) and by clicking the Plot Track button, the track specified is visualized, along with the bounding box specifying the supported domain, in the Map widget. The cone of possible tracks based on the time to landfall is also displayed as a pair of bounding tracks. 
  3. User specifies whether a probabilistic analysis is desired. By clicking the Perform Calculation button, a status bar appears in the Map widget updating progress as the calculations are executed. 

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  4. Within minutes, the visualization is rendered within the interactive Map widget as a color contour map showing wave heights in meters and coastal contours showing surge inundation, with full zooming and panning capabilities.
  5. The result is locally stored and accessible via the Result Manager widget. This allows the user to execute multiple scenarios, e.g., slightly perturbing the input variables, and having these all available on the dashboard via the Result Manager widget. Within the Results Manager widget, users can select one or more entries (using the checkboxes) and through the drop down menu in this widget, either delete, export or curate the run in the Data Warehouse. The export option downloads a zipped bundle containing numerous files including PNG and GeoTIFF images of the results and a series of JSON documents, Mapfiles, Shapefiles and binary files for the grid, tracks, and/or wave and surge heights over the spatial domain. These results can then be integrated by the user into any off-line analysis needed to support emergency planning and response. 
  6. Clicking any one of the entries in the Results Manager widget allows the user to instantly visualize the results from previous runs without the need to repeat the calculation. The Visualization Controls widget allows the user to selectively specify the surge and wave results to be rendered in the Map widget for the selected result, at any of the default as well as user-defined probabilities of exceedance. 

 

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