Modeling Of Fire Behave And Aid-Decision For Emergency Response In Wildland-Urban Interface

Wildland-Urban interface (WUI) fire is a new issue in fire science, and is becoming one of the hotspots of WUI fire. In contrast with the developed countries, the WUI fire research in china poses a relatively under developed state, remaining much blankness in those correlative key techniques and leading to the lacking of scientific references and technical methods in real city construction projects. Facing the great needs of WUI fire prevention and encircling the international frontier subject of fire spread in WUI fire, this paper focuses in the construction of fire spread model based on thermal radiation mechanism of WUI fire to predict the fire spread trend and in developing the Aid-Decision for Emergency response in Wildland-Urban Interface with in-time scientific guiding and technical reference of WUI fire as our objections.Firstly, taking crown fire as the typical object, we studied the thermal radiationeffect of crown fire to the construction and built the WUI fire behave model.According to the superposition ability and through fire characteristics of realvegetation, we developed the thermal geometry radiation model of inclined columnfor single tree and calculated its visual angle coefficient, and expanded it to thesituation of multiple trees forming the simplified model of multi-tree thermal radiation.Through experimental study of typical crown fire using pine tree, we first measuredits heat release rate and the inter-space thermal radiation variation of crown fire ofsingle pine tree and compared the experimental data with the model prediction,validating the rationality of the thermal radiation model of single tree. At last, wemeasured the inter-space thermal radiation variation of multiple trees combustion andalso compared the results with the model prediction. The research showed that underthe condition of no outer ventilation/low ventilation in open space, the single treemodel and multiple trees model can accurately predict the variation of radiation heatflux. Secondly, using cellular automaton model to construct the WUI fire spread model, we theoretically analyzed the fuel distribution of WUI and gave the four fire spread models in WUI fire spread including the fire spread from vegetation to vegetation, fire spread from vegetation to construction, fire spread from construction to construction and the fire spread from construction to vegetation, based on the Berjak's fire spread model and A.Ohgai's model, forming the multiplex fire spread model suit for the entire WUI fire.At last, combining the cellular automaton and the GIS network grid, circling themultiplex fire spread model, we set up the Aid-Decision system for Emergencyresponse through computer techniques and performed the case study of Black Tigerfire with the system. According to the real fire spread process, we examined thepracticability of this system. The result showed that the Aid-Decision system forEmergency response can visually and simulate the fire spread process of Black Tigerfire. The simulation of fire spread matches the real fire development well. Result alsoshowed that the fire spread distance of simulation is approximate to the recording data,proving that this system can well simulate the tendency of forest fire spread and thepossibility of damage to the construction.