土壤-植被混合地表红外辐射温度场的耦合建模方法

摘要

Present mathematical models for simulating the temperature field of mixted terrain surface often simplify the energy transfer process by omitting the interactive fluxes among terrain components, which trails off the accuracy of simulation results. This paper proposed a coupled model for soil-vegetation mixed terrain based on the analysis of the material components and the spatial distribution characteristics. By integration of the interactive radiation fluxes between material components, the energy balance for soil-vegetaion-atmosphere was expressed in the coupled model. Experiment results show that the temperature field distribution and infrared images obtained using the proposed model are more likely to correspond with reality, which justifies the effectiveness of the coupled model.%目前混合地表温度场的数学模型忽略了地表内部各组分间的热通量交互,致使温度场模拟结果不够准确、真实.针对已有独立求解模型的不足,结合土壤-植被混合地表的材质组成及空间分布特点,建立温度场的耦合求解模型,通过在热平衡方程中引入组分间热通量的交互项,对土壤-植被-大气耦合的能量平衡过程进行描述.实验结果表明,利用耦合模型求解的混合地表的温度场分布和热图像特征与自然地表红外辐射特性的真实分布规律具有更好的一致性,从而验证了温度场耦合建模方法的有效性.