Effect of Canyons on a Fire Propagating Laterally Over Slopes

Rodrigues, André; Ribeiro, Carlos Fernando Morgado; Raposo, Jorge; Viegas, Domingos X.; André, Jorge

doi:10.3389/fmech.2019.00041

Cited by 19 publications

(12 citation statements)

References 15 publications

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“…The fuel bed for the experiments was composed of dry particles of pine needles of Pinus pinaster with a constant load of 600 g m −2 (dry basis) (Viegas and Pita 2004;Xie et al 2014;Raposo 2016;Raposo et al 2018;Rodrigues et al 2019;Viegas et al 2021Viegas et al , 2022. During the preparation of each test, the air temperature (°C), relative humidity (%) and fuel moisture (m f ) were monitored and the conditions of the fuel load and bulk density were controlled.…”

Section: Laboratory Experimentsmentioning

confidence: 99%

Slope effect on junction fire with two non-symmetric fire fronts

Ribeiro

Viegas

Raposo

et al. 2023

Int. J. Wildland Fire

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Background. In Pedrógão Grande on 17 June 2017, two fire fronts merged and the propagation of the fire was influenced by the interaction of these non-symmetric fire fronts. Aims. This wildfire motivated us to study a junction fire with two non-symmetrical fire fronts. The analysis of the movement of the intersection point and the angle (γ) between the bisector of the fire lines and the maximum rate of spread (ROS) direction is of particular relevance. Methods. The study was carried out at Forest Fire Laboratory of the University of Coimbra in Lousã (Portugal) with laboratory experiments. Key results. We found that, for small rotation angles (δ), the nondimensional ROS of the intersection point depends on the slope angle (α) and the initial angle between fire fronts. Conclusions. For high α, the non-dimensional ROS was highly influenced by the convection process and γ where the maximum ROS occurred, increased when δ increased. However, the radiation process was more relevant for lower α and influenced the nondimensional ROS. For these cases, the maximum spread direction was close to that of the fire line bisector. Implications. The present work aimed to explain fire behaviour during the Pedrógão Grande wildfire.

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Section: Laboratory Experimentsmentioning

confidence: 99%

Slope effect on junction fire with two non-symmetric fire fronts

Ribeiro

Viegas

Raposo

et al. 2023

Int. J. Wildland Fire

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“…Post-fire simulation has found slope, relative to the direction of a spreading fire, to predict home destruction [21]. A steep topography can increase the rate of wildfire spread or cause erratic behavior [23][24][25], and rough terrain can impede firefighter access [26]. Thus, a steep topography places nearby homes at risk [27], especially during rapid, wind-driven fires when suppression is particularly challenging [20,28].…”

Section: Parcel-level Hazardmentioning

confidence: 99%

Parcel-Level Risk Affects Wildfire Outcomes: Insights from Pre-Fire Rapid Assessment Data for Homes Destroyed in 2020 East Troublesome Fire

Meldrum

Barth

Goolsby

et al. 2022

Fire

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Parcel-level risk (PLR) describes how wildfire risk varies from home to home based on characteristics that relate to likely fire behavior, the susceptibility of homes to fire, and the ability of firefighters to safely access properties. Here, we describe the WiRē Rapid Assessment (RA), a parcel-level rapid wildfire risk assessment tool designed to evaluate PLR with a small set of measures for all homes in a community. We investigate the relationship between 2019 WiRē RA data collected in the Columbine Lake community in Grand County, Colorado, and whether assessed homes were destroyed in the 2020 East Troublesome Fire. We find that the overall parcel-level risk scores, as well as many individual attributes, relate to the chance that a home was destroyed. We also find strong evidence of risk spillovers across neighboring properties. The results demonstrate that even coarsely measured RA data capture meaningful differences in wildfire risk across a community. The findings also demonstrate the importance of accounting for multiple aspects of PLR, including both hazards and susceptibility, when assessing the risk of wildfire to homes and communities. Finally, the results underscore that relatively small actions by residents before a fire can influence wildfire outcomes.

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“…For each test were used 10 kg of shrubs. Shrubs were used according to previous studies placed (Pinto et al, 2017;Rodrigues et al, 2019;D. X. Vegas et al, 2021;Viegas et al, 2006), and it is the same fuel present in the field test.…”

Section: Laboratory Testsmentioning

confidence: 99%

Mobile LPG cylinders at WUI fires: an alternative to avoid accidents

Barbosa¹,

Reis²,

Raposo³

et al. 2022

Advances in Forest Fire Research 2022

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Accidents related to mobile cylinders filled with Liquefied Petroleum Gas (LPG) stored in houses at the Wildland Urban-Interface (WUI) occurred several times in Portugal in 2016 and 2017, closely linked to three large wildfires. Due to the amount of energy stored, the cylinders jeopardise the vicinity and become a potential risk for people and structures when a WUI fire occurs. This paper presents an experimental evaluation under fire conditions of two different protective devices to be used to protect cylinders filled with LPG at WUI areas; and to avoid extreme events like BLEVE. The first protective device is made with a thin fabric and the second one with a ceramic plate. These protective devices were tested at different distances from the flames and under similar conditions. The heat fluxes that reach the protectionÂ´s and cylinderÂ´s surfaces were measured, the same was done with temperature. The percentage of thermal flux blockage for both devices was compared. The temperature of the cylinder was compared with the room temperature.

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Effect of Canyons on a Fire Propagating Laterally Over Slopes

Cited by 19 publications

References 15 publications

Slope effect on junction fire with two non-symmetric fire fronts

Slope effect on junction fire with two non-symmetric fire fronts

Parcel-Level Risk Affects Wildfire Outcomes: Insights from Pre-Fire Rapid Assessment Data for Homes Destroyed in 2020 East Troublesome Fire

Mobile LPG cylinders at WUI fires: an alternative to avoid accidents

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