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| Titel |
Evaluation of wildland fire smoke plume dynamics and aerosol load using UV scanning lidar and fire–atmosphere modelling during the Mediterranean Letia 2010 experiment |
| VerfasserIn |
V. Leroy-Cancellieri, P. Augustin, J. B. Filippi, C. Mari, M. Fourmentin, F. Bosseur, F. Morandini, H. Delbarre |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 3 ; Nr. 14, no. 3 (2014-03-04), S.509-523 |
| Datensatznummer |
250118328
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| Publikation (Nr.) |
 copernicus.org/nhess-14-509-2014.pdf |
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| Zusammenfassung |
Vegetation fires emit large amount of gases and aerosols which are
detrimental to human health. Smoke exposure near and downwind of fires
depends on the fire propagation, the atmospheric circulations and the burnt
vegetation. A better knowledge of the interaction between wildfire and
atmosphere is a primary requirement to investigate fire smoke and particle
transport. The purpose of this paper is to highlight the usefulness of an UV
scanning lidar to characterise the fire smoke plume and consequently validate
fire–atmosphere model simulations.
An instrumented burn was conducted in a Mediterranean area typical of ones
frequently subject to wildfire with low dense shrubs. Using lidar
measurements positioned near the experimental site, fire smoke plume was
thoroughly characterised by its optical properties, edge and dynamics. These
parameters were obtained by combining methods based on lidar inversion
technique, wavelet edge detection and a backscatter barycentre technique. The
smoke plume displacement was determined using a digital video camera coupled
with the lidar.
The simulation was performed using a mesoscale atmospheric model in a large
eddy simulation configuration (Meso-NH) coupled to a fire propagation
physical model (ForeFire), taking into account the effect of wind, slope and
fuel properties. A passive numerical scalar tracer was injected in the model
at fire location to mimic the smoke plume. The simulated fire smoke plume
width remained within the edge smoke plume obtained from lidar measurements.
The maximum smoke injection derived from lidar backscatter coefficients and
the simulated passive tracer was around 200 m. The vertical position of the
simulated plume barycentre was systematically below the barycentre derived
from the lidar backscatter coefficients due to the oversimplified properties
of the passive tracer compared to real aerosol particles. Simulated speed
and horizontal location of the plume compared well with the observations
derived from the videography and lidar method, suggesting that fire convection
and advection were correctly taken into account. |
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