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Resolving Checkerboarding Issue in SLOSH Model: Recommendations and Observations

This document discusses the cross Laplacian method used in the SLOSH model to address checkerboarding issues, highlighting areas of concern and possible solutions. Recommendations include changing HCRT values and detecting checkerboarding in specific conditions.

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Resolving Checkerboarding Issue in SLOSH Model: Recommendations and Observations

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  1. Xfilter and checkerboards August 15, 2011 Arthur Taylor MDL/NWS/NOAA

  2. X-Filter • Background • June 2011 – C. Forbes and A. Taylor introduced the cross laplacian as part of the smoothing methods that the SLOSH model uses to resolve checkerboarding • NHC reported that this did not solve the problem. • Aug 2011 – A. Taylor looked into the areas of concern. They appear to be areas with < 1 feet above ground level values. • Observation: The smoothing code ignores land wetted less than HCRT. So no smoothing took place. • Options: • A) Change HCRT from 0.5 to 0.1 feet. • B) Detect checkerboarding only for water above grid cell > 0.5 • Note: Using HCRT = 0.0 will flood entire basin.

  3. d215L020_R20_Dhigh (HCRT=0.5)(70,116); (76,113) Above Datum Above Ground Level

  4. d215L020_R20_Dhigh (HCRT=0.1)(70,116); (76,113) Above Datum Above Ground Level

  5. a105L030_R20_Dhigh (HCRT=0.5)(84,93); (70,92); (16,167); (60,156) Above Datum Above Ground Level

  6. a105L030_R20_Dhigh (HCRT=0.5)(84,93); (70,92); (16,167); (60,156) Above Datum Above Ground Level

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