نتایج جستجو برای: forest fire
تعداد نتایج: 143001 فیلتر نتایج به سال:
Recently in order to extinguish large scaled of forest fire efficiently many helicopters tend to be mobilized. In this situation, the most consideration for the rapid extinguish is the effective arrangement and management of helicopters, which is regard as the most important forest fire extinguish equipment. In this paper, client/serve based forest fires extinguish equipment management system i...
This paper aims in the design and development of a Decision Support System performing forest fire risk estimation of forest departments in Greece. The system applies a Fuzzy Logic model that considers a variety of independent variables. This approach takes into consideration the center of gravity of every independent variable, in order to produce various scenarios, having the advantage of evalu...
Wildfire refugia are forest patches that are minimally-impacted by fire and provide critical habitats for fire-sensitive species and seed sources for post-fire forest regeneration. Wildfire refugia are relatively understudied, particularly concerning the impacts of subsequent fires on existing refugia. We opportunistically re-visited 122 sites classified in 1994 for a prior fire refugia study, ...
A sensitivity analysis was conducted of the National Fire Management Analysis System (NFMAS) to better understand the relationship between data input and model output. After consultations with fire managers and researchers, five input variables were selected for sensitization: unit mission costs, average acre costs, net value change, production rates, and escaped fire limits. A random sample of...
The Angora Fire burned 1243 ha of Jeffrey pine andmixed conifer forest in the Lake Tahoe Basin between June 24 and July 2, 2007. The Angora Fire burned at unusually high severity due to heavy fuels; strong winds; warm, dry weather; and unseasonably low fuel moistures. The fire destroyed 254 homes, and final loss and suppression cost estimates of $160,000,000 make the Angora Fire one of the ten ...
This paper is devoted a problem of development of a mathematical model for description of heat and mass transfer processes at crown forest fire initiation and spread. Mathematical model of forest fire was based on an analysis of experimental data and using concept and methods from reactive media mechanics. This study gives a two dimensional averaged mathematical setting and method of numerical ...
We describe a simulation model concerning a scenario of a burning forest and fire-fighters battling with blaze. The simulator addresses three layers of the scenario. We model spreading of the fire, a network of sensors gathering temperature data from the forest and fire-fighters actions taken automatically on the basis of sensors data. We also provide initial simulation results showing how the ...
Historically, oak forests and woodlands intergraded with southern boreal forest, temperate mesic forest, and grassland biomes, forming complex fire-mediated relationships in the Great Lakes region of Minnesota, Wisconsin, and Michigan, USA. Variability in fire recurrence intervals allowed oaks to mix with grasses or with mesic forest species in areas with high (2–10 yr) or moderate (several dec...
A novel approach for forest fire detection using image processing technique is proposed. A rule based color model for fire pixel classification is used. The proposed algorithm uses RGB and YCbCr color space. The advantage of using YCbCr color space is that it can separate the luminance from the chrominance more effectively than RGB color space. The performance of the proposed algorithm is teste...
In this paper the overall structure of forest fire monitoring system based on image analysis is designed and realized. The system includes three subsystems, which are the fire monitoring nodes based on image analysis, the forest fire prevention data center and remote monitoring terminal. It emphasizes the software and hardware realization of the fire monitoring nodes based on image analysis, an...
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