中文摘要：

以樟子松针叶床层为例,初步研究可燃物结构床层结构特征对其失水过程中时滞和平衡含水率参数（基于Nelson模型）的影响。通过对15个不同厚度、载量、密度的樟子松可燃物床层的失水过程的分析,估计这些床层的时滞和平衡含水率参数,利用这些参数进行可燃物含水率模拟的平均绝对误差和均方根误差均不超过0.01,所估计的可燃物含水率参数有效。对可燃物床层结构特征对这些参数的影响的研究表明,可燃物床层厚度和载量对时滞和平衡含水率的2个参数a、b具有有显著影响,与时滞和平衡含水率参数b正相关,与平衡含水率参数a负相关,据此建立可燃物含水率参数的预测模型。该模型高估了时滞和平衡含水率参数b,低估了平衡含水率参数a。所得结果还有一些不确定性,特别是可燃物结构特征对平衡含水率参数的影响,需要在更宽的温湿度范围内、针对其他平衡含水率模型和在失水吸水2个过程上进一步研究。

英文摘要：

Prediction of fuel moisture content based timelag and equilibrium moisture content is a accurate method,which is commonly employed in the American National Fire Danger Rating System and the Canadian Forest Fire Danger Rating System.The timelag and equilibrium moisture content constants vary with fuel types and structure.A preliminary study was conducted on the effects of fuelbed structure features on these parameters in desorption process of fuelbeds composed of Scots pine needles.The results indicated that with the Catchpole’s method,the fuel moisture was well modelled with errors within 0.01,which approved the validity of the estimated parameters.Further analysis revealed that fuelbed depth and load affected these parameters： timelag and constant b of Nelson（1984） model were positively,and constant a of the model was negatively,correlated with these features.Models established for predicting these parameters from these fuelbed structure features overestimated timelag and constant b but underestimate constant a.There exist some uncertainty in the analysis,and futher research is needed on both desorption and absorption processes with other equilibrium moisture models and under broader weather conditions.