美国国家火险等级系统原理及应用

 介绍了美国国家火险等级系统（NFDRS）的发展历程、原理方法、系统结构，指出系统通过考虑不同类型可燃物对火灾发生的贡献，基于燃烧原理和点烧实验建立物理模型，计算输出全面的防火指标，其思路方法适用于气候复杂、植被类型多样的中国。对系统中值得借鉴的可燃物含水率计算、防火指标计算等关键技术进行重点分析，并结合中国火险等级预报业务现状对系统的本地化改进和业务化应用进行了展望。

Principle of the US national fire danger rating system and its application prospect

Absorbing the advanced experience of forest fire warning and control in the world, establishing the fire risk rating system based on combustion mechanism can further improve the comprehensive ability of forest fire prevention and control in China and reduce the loss of forest resources. Based on National Fire Danger Rating System (NFDRS), the paper introduces the development history, technical method and system structure, argues that NFDRS is a physical model based on combustion mechanism and experiments, considers the contribution of different fuels to fire, calculates and provides comprehensive indexes to facilitate the planning of fire control activities. The structure and method of NFDRS are applicable to China with complex climate and diverse vegetation types. Therefore, the paper discusses the key technologies in the system, such as the calculation of moisture content of combustible and the calculation of fire protection index. By considering the current situation of forest fire prevention in China, the paper proposes the introduction of NFDRS into forest fire management and fire control strategy in China in order to provide references for establishing national fire danger system in China.