Citation

Wheatley M, Cotton-Gagnon A, Boucher J, Wotton BM, McFayden CB, Jurko N, Robinson J. Int. J. Wildland Fire 2023; 32(8): 1269-1276.

Copyright

(Copyright © 2023, International Association of Wildland Fire, Fire Research Institute, Publisher CSIRO Publishing)

DOI

10.1071/WF22218

PMID

unavailable

Abstract

Background There has been little quantification of the extent and duration of micrometeorological changes within a forest after airtanker drops of water-based suppressant. It has been speculated that a period of prolonged relative humidity - referred to as a 'relative humidity (RH) bubble' - temporarily exists in the canopy understorey post-drop.Aims We quantify the RH bubble from the drops of five airtankers commonly used by wildland fire management organisations in Canada.

METHODS We measured airtankers dropping water, foam concentrates, and gel enhancers in a mature jack pine stand. We examined the duration of change in RH and temperature using Generalised Additive Models, and the consequence of these changes on fine fuel moisture.Key results The average maximum RH increased and temperature decreased, indicating that the effects of the 'RH bubble' in-stand lasted from 25 to 76 min, depending upon the airtanker type and load configuration.

CONCLUSION Airtanker drops cause an in-stand increase in RH and decrease in temperature, but this ambient change has a limited effect on potential fire behaviour.Implications The direct effect of water wetting the fuel is the most impactful effect of an airtanker drop. The 'RH bubble' created, though observable, does not change fine fuel moisture enough to impact fire behaviour.

Language: en