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A Fuel dryness index for grassland fire-danger assessment

Snyder, Richard L. and Spano, Donatella Emma Ignazia and Duce, Pierpaolo and Baldocchi, Dennis and Xu, Liukang and Paw U, Kyaw Tha (2006) A Fuel dryness index for grassland fire-danger assessment. Agricultural and Forest Meteorology, Vol. 139 (1-2), p. 1-11. ISSN 0168-1923. Article.

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DOI: 10.1016/j.agrformet.2006.05.006

Abstract

The assessment of fuel moisture content on a large spatial scale requires several observations and estimates and is often time consuming and costly due to labour and transportation expenses. Therefore, various models based on empirical functions of weather variables have been developed and applied to determine the amount of moisture in fuel. In this paper, a fuel dryness index (Fd) based on biophysical principles associated with energy exchange is presented and applied to monitor fuel moisture content for annual grasslands. Daily values of Fd were determined as the ratio of sensible heat flux density to the available energy using high-frequency temperature data and the surface renewal (SR) method in combination with net radiation and soil heat flux values. The SR method was evaluated by comparing with sensible and latent heat flux densities from eddy covariance data measured in a fire-vulnerable annual grassland. The Fd values and trends were compared with three well-known slow response fire-danger indices including the Keetch–Byram drought index, two modified versions of the drought factor in the McArthur forest fire-danger meter, and the fast response fine fuel moisture code of the Canadian fire weather index. Moreover, Fd index was compared with the McArthur grassland fire-danger meter. The Fd index was more responsive to daily changes than most of the other indices, providing accurate information on fuel dryness condition of a live vegetation grassland. In addition, it can potentially eliminate the need for calibrated empirical weather models and fuel stick measurements.

Item Type:Article
ID Code:5178
Status:Published
Refereed:Yes
Uncontrolled Keywords:Wildfire, energy balance, eddy covariance, surface renewal, temperature ramps, evapotranspiration
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/03 Arboricoltura generale e coltivazioni arboree
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di biometeorologia, Sassari
001 Università di Sassari > 01 Dipartimenti > Economia e sistemi arborei
Publisher:Elsevier
ISSN:0168-1923
Deposited On:01 Dec 2010 12:06

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