冻结土壤介电常数混合模型机理研究  

Study on the permittivity mixing model of freezing soil

作　　者：靳潇 杨文 赵剑琦[3] JIN Xiao;YANG Wen;ZHAO Jianqi(Key Laboratory of Land Process and Climate Change in Cold Arid Regions,Northwest Institute of Eco-Environmental and Resources Chinese Academy of Sciences,Lanzhou 730000,China;Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 10029,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西北生态环境资源研究院寒区旱区陆面过程与气候变化重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]中国科学院大气物理研究所,北京100049

出　　处：《冰川冻土》2018年第3期570-579,共10页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41475018)资助

摘　　要：介电常数是微波辐射传输理论所需的最重要、最基本的参数。通过研究平均温度低于-4℃,组分中含有冰的土壤——冻结土壤,建立了一种适用于微波波段冻结土壤的介电常数混合模型。该模型考虑了土壤温度、微波频率、土壤质地以及其中未冻水含量的影响。模型使用一点法计算未冻水含量,引入Stern双电层理论计算冻结土壤未冻水的介电常数,引入Maxwell-Garnett介电常数混合理论、介电常数容积混合理论构建冻结土壤介电常数混合模型。模型计算结果与实测资料进行了详细的对比分析,冻结土壤介电常数混合模型给出的介电常数实部、虚部的曲率与实验结果很好吻合,模型结果比较满意,对比分析证实了模型的可靠性。Permittivity is the most important and basic parameter in microwave radiative transfer theory. The frozen soil studied in this paper refers to the soil containing ice at the average temperature below-4 ℃. In this paper,a newpermittivity mixing model for microwave frozen soil has developed,in which the effects of soil temperature,frequency,soil texture and unfrozen water content have taken into account. The newpermittivity mixing model uses a point method to calculate the unfrozen water content,uses Stern-Gouy double layer theory to calculate permittivity of unfrozen water,uses Maxwell-Garnett mixing theory and mixing permittivity volume theory to establish dielectric constant mixture model of frozen soil. Comparison and analysis of the theoretical and experimental dielectric constants showed that curves of the imaginary part and real part of the model agree well with the experimental results,respectively. The comparison results are satisfactory and the reliability of the model is proved.

关 键 词：冻结土壤介电常数 未冻水介电常数 Stern双电层 Maxwell-Garnett混合理论 介电常数容积混合模型 

分 类 号：P642.14[天文地球—工程地质学]