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《Remote Sensing Technology and Application》 2017-06
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Comparative Analysis of Soil Water and Salt Dielectric Model

Wei Long;Wang Weizhen;Wu Yueru;Ma Chunfeng;Key Laboratory of Remote Sensing of Gansu Province,Heihe Remote Sensing Experimental Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
The soil dielectric constant,the basis of the microwave remote sensing inversion of soil water and salt,is one of the main parameters of microwave remote sensing research.It is very important to select the high precision soil water and salt dielectric model to improve the precision of soil water and salt inversion.However,the existing soil water and salt model still can't quantitatively describe the effect of salt factor on soil permittivity.This paper simulates the complex permittivity of different texture,water content and salinity wet soil by Dobson model,Dobson-S model,GRMDM model,HQR model and WYR model at L-,Cand X-bands when soil temperature equal 25 ℃.Comparison and analysis the simulation values with measured values by microwave vector network analyzer.The results show:(1)Dobson model and GRMDM model can accurately simulate the real part of dielectric constant of non-saline soil,while the stimulated values of imaginary part is less than the measured values;(2)Dobson-S model can well simulate the real part of the dielectric constant of saline soil,at L-,C-and X-bands the correlation coefficient R equal 0.97,the RMSE is less than 2.10.But for the imaginary part of the dielectric constant of saline soil,the Dobson-S model,HQR model and WYR model with different simulation accuracy,when soil water content different.This study would benefit the choice of a suitable soil dielectric model for soil moisture and salinity retrieval.
【Fund】: 国家自然科学基金项目(41671373、41301363);; 中国科学院西部博士项目“盐渍土微波介电特性及模型的构建”;; 高分辨率对地观测系统重大专项(民用部分)(30-Y20A34-9010-15/17)
【CateGory Index】: TP722.6
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