Injection Height of Biomass Burning EmissionRonon Paugam
King's College, London
Wednesday, September 8th, CERFACS Conference Room - 14h00
The focus of this study is laid on the relation between emitted fire radiative power (FRP) and smoke plume height. Once validated for different weather conditions and different fire characteristics, such a relation could be used to set up a parametrization of fire injection in global atmospheric chemical transport model (CTM). The study is based on both numerical simulation and observations. The numerical approach follows a two successive simulations strategy that first focuses on the study of FRP. Based on the capability of the WFDS model in fire simulation (and validation on prescribed fires), the effects of several parameters such as wind, fuel mass, or fire extension on FRP magnitude are investigated. The partitioning of the emitted energy between different processes such as radiation and convection is also studied. The second step simulation is based on a fire plume model. This plume model is already used in different host models (e.g. WRF, BRAMS). In its current version, the fire is modelled by: a convective heat flux (pre-defined by the land cover and evaluated as a fixed part of the total heat released); and a plume radius which defines the fire extension where the FRP is homogeneously distributed. Here in our approach its initialization is modified to use results based on WFDS simulation and observations, to directly force the convective heat flux from FRP data. Validation of this new initialization method should be achieved by comparing our results with remote sensing products from MISR for several test case fires.
This describes the overall project held at Kings College London on injection height of wildland fire. So far, most of the effort of this project was dedicated to the validation of the WFDS model for grass fire. Although this validation is still in progress, it would form the main core of my presentation.
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