14 documents found, page 1 of 2
Numerical investigation of the Pedrógão Grande pyrocumulonimbus using a fire to...
Couto, Flavio Tiago; Filippi, Jean-Baptiste; Baggio, Roberta; Campos, Cátia; Salgado, RuiUnderstanding the development of fire-generated thunderstorms in mega fire events is important given their high impact on the evolution of the fire fronts, where the fire spread becomes highly unpredictable and difficult to suppress. This study aims to investigate numerically the influence of strong pyro-convective activity on the local atmospheric conditions by means of a numerical simulation based on the coup...
Triggering Pyro-Convection in a High-Resolution Coupled Fire–Atmosphere Simulation
Couto, Flavio Tiago; Filippi, Jean-Baptiste; Baggio, Roberta; Campos, Cátia; Salgado, RuiThis study aimed to assess fire–atmosphere interactions using the fully coupled Meso-NH–ForeFire system. We focused on the Pedrógão Grande wildfire (28,914 ha), which occurred in June 2017 and was one of the deadliest and most damaging fires in Portugal’s history. Two simulations (control and fully coupled fire–atmosphere) were performed for three two-way nested domains configured with horizontal resolutions of...
Modelling fire-induced meteorological phenomena using the MesoNH/ForeFire model
Campos, Cátia; Couto, Flavio Tiago; Filippi, Jean-Baptiste; Baggio, Roberta; Salgado, RuiCloud-resolving models coupled to fire propagation models is a powerful tool to understand fire-atmosphere environment. Portugal is one of the countries in Southern Europe with most burned area and numerous ignitions. In 2017, Portugal was affected by several mega-fires with burned areas larger than 10 000 hectares. Some of these fires presented the development of convective clouds, namely pyro-cumulus (pyroCu)...
Towards a better understanding of pyroconvective clouds using Meso-NH/ForeFire ...
Couto, Flavio Tiago; Campos, Cátia; Filippi, Jean-Baptiste; Baggio, Roberta; Purificação, Carolina; Santos, Filippe L. M.; Salgado, RuiIn 2017, Portugal was affected by several mega-fire episodes, which led the convective clouds formation, i.e., pyroCumulus (pyroCu) or pyroCumulonimbus (pyroCb). The pyroCb plays a crucial role in the fire front evolution through feedback processes between the atmosphere and the fire, including increased burn and spread rates by surface wind speed and direction variations. In order to investigate the pyro-conve...
Meteorological conditions favouring the development of mega-fires
Campos, Cátia; Couto, Flavio Tiago; Purificação, Carolina; Salgado, Rui; Filippi, Jean-Baptiste; Baggio, RobertaIn recent years, the development of clouds due to the convection created by the fire has been reported in several wildfires. These clouds can be of 2 types: pyro-cumulus (PyroCu) or pyro-cumulonimbus (PyroCb). In 2017, Portugal recorded 11 mega-fires, of which 8 occurred on October 15, 2017. As a case study of pyro-convection, the Quiaios wildfire was chosen. In this study, two numerical simulations were made u...
Modelling pyro-convective activity and the meteorological conditions leading to...
Campos, Cátia; Couto, Flavio Tiago; Purificação, Carolina; Filippi, Jean-Baptiste; Baggio, Roberta; Salgado, RuiMega-fires are wildfires that burn an area greater than 10.000 hectares. Despite being a minority in relation to the total number of fires, they are the one with the greatest negative impact on society and the environment. Associated with this wildfire type, the phenomenon of pyro-convection has been reported in several cases. Strong pyro-convective activity can lead to the formation of clouds within the smoke ...
Modelling fire-generated thunderstorms: Pedrógão Grande case study
Couto, Flavio Tiago; Filippi, Jean-Baptiste; Baggio, Roberta; Salgado, RuiThe development of PyroCumulonimbus clouds during mega fire events has high impact in the evolution of the fire fronts and their development is frequently associated with strong convective processes due the heat and moisture released by the combustion. In 2017, Portugal was affected by several episodes of extreme wildfires with such a cloud system. The “Pedrógão Grande” mega fire caused more than 60 fatalities ...
O fenómeno da piro-convecção e condições de larga escala que favorecem o desenv...
Campos, Cátia; Couto, Flavio Tiago; Purificação, Carolina; Salgado, Rui; Filippi, Jean-Baptiste; Baggio, RobertaIn this study, two numerical simulations were made using the MesoNH atmospheric model: a simulation coupled with the fire propagation model, ForeFire, with 3 nested domains (2000m, 400m and 80m of horizontal resolution) and a noncoupled simulation, with a single domain of 15km horizontal resolution. From the first simulation, significant pyroconvective activity was confirmed from the moment that some type of hy...
Modelling pyro-convection phenomenon during a mega-fire event in Portugal
Campos, Cátia; Couto, Flavio Tiago; Filippi, Jean-Baptiste; Baggio, Roberta; Salgado, RuiThe present study contributes to an increased understanding of pyro-convection phenomena by using a fire-atmosphere coupled simulation, and investigates in detail the large-scale meteorological conditions affecting Portugal during the occurrence of multiple mega-fires events on 15 October 2017. Two numerical simulations were performed using the MesoNH atmospheric model. The first simulation, was run for a large...
INTERCOMPARAÇÃO DE SIMULAÇÕES NUMÉRICAS COM MODELOS ATMOSFÉRICOS ACOPLADOS A MO...
Couto, Flavio; Salgado, Rui; Filippi, Jean-Baptiste; Baggio, Roberta; Kartsios, Stergios; Cardoso, Rita; Soares, Pedro; Campos, CátiaA propagação do fogo associada à atividade piro-convectiva extrema é atualmente altamente imprevisível e difícil de combater. Este relatório apresenta os principais resultados de simulações realizadas a partir do acoplamento entre modelos de resolução de nuvens e modelos de propagação de fogo, nomeadamente MesoNH/ForeFire, WRF/FIRE e WRF/SFIRE. Os códigos acoplados foram utilizados no estudo dos mega incêndios ...