Title: A comparison of 3 models of 1-hr timelag fuel moisture in Hawaii
Author: Weise, D.R.; Fujioka, F.M.; Nelson, R.M.
Source: Agricultural and Forest Meteorology 133:28-39
Description: The U.S. National Fire Danger Rating System currently uses a moisture diffusion model developed by Fosberg to predict fine fuel moisture in woody fuels. Nelson recently developed a fuel moisture model that includes functions for both heat and moisture transfer. Fuel moisture samples were collected in Hawaii hourly for up to 96 h for three litter, one herbaceous, and eight grass fuels at sites ranging from near sea level to 2200 m.Weather data were collected every 5 min. Observed fuel moistures were compared to predictions from three models—a simplified form of Fosberg’s equation (Simple), the Nelson physical model, and a Markov model fit to the observed data. Mean difference, average deviation, and percentage of predictions closer to the observed data than the Simple model were used to evaluate model performance. Performance of the Markov model was best and of the Simple model was poorest. All models underestimated fuel moisture with the Simple model having the greatest errors and the Markov model having the smallest. The Markov model and the Nelson model predictions were closer to the observed fuel moistures than the Simple model for more than 75% of the observations. Further testing and application of the Nelson physical model is recommended.
Keywords: moisture; wildland; model; fire; danger
View and Print this Publication (314.6 KB)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to email@example.com to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility
Weise, D.R.; Fujioka, F.M.; Nelson, R.M. 2005. A comparison of 3 models of 1-hr timelag fuel moisture in Hawaii. Agricultural and Forest Meteorology 133:28-39.