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Flame-front rate of spread estimates for moderate scale experimental fires are strongly influenced by measurement approach

Author(s): Joshua M. Johnston, Melanie J. Wheatley, Martin J. Wooster, Ronan Paugam, G. Matt Davies, Kaitlin A. DeBoer
Year Published: 2018

Understanding wildfire rate of spread (RoS) is often a key objective of many fire behavior modelling and measurement exercises. Using instrumented moderate scale laboratory burns we provide an assessment of eight different methods of flame front RoS determination, including visible imagery (VIS) analysis techniques, use of thermocouple arrays, and four thermal infrared (IR) image analysis approaches. We are able to (1) determine how measurement approach influences derived RoS, and (2) recommend the best method to reproduce the accepted standard (Thermocouple Grid Array measurement) RoS without ground sampling. We find that derived RoS is statistically significantly influenced by the measurement approach, and that failing to fully account for directionality of the RoS may result in significant error. We identify one of the thermal infrared imaging methods (described in Paugam et al. 2013), as the most appropriate for providing rate and direction of spread at these scales of measurement.

Citation: Johnston JM, Wheatley MJ, Wooster MJ, Paugam R, Davies GM, DeBoer KA. 2018. Flame-Front Rate of Spread Estimates for Moderate Scale Experimental Fires Are Strongly Influenced by Measurement Approach. Fire 1(1), 16. https://doi.org/10.3390/fire1010016
Topic(s): Fire Behavior, Data Evaluation or Data Analysis for Fire Modeling
Ecosystem(s): None
Document Type: Book or Chapter or Journal Article
NRFSN number: 17768
Record updated: Jul 8, 2018