Study on soil dielectric constant models:A review

XU Xingqian; WANG Haijun; QU Xin; PENG Guangcan; ZHAO Xi

doi:10.13522/j.cnki.ggps.2023380

Abstract：[Objective]Soil dielectric constant measures the ability of a soil to transmit electric fields.It is the ratio of the capacitance of a soil sample to the capacitance of air-filled space of the same volume.In this paper,we systematically analyze the factors that influence the dielectric constant,offering an updated perspective on soil dielectric constant modeling.[Method]This study systematically identifies the primary factors influencing soil dielectric constant based on soil dielectric theory.Additionally,it categorizes and summarizes existing soil dielectric constant models,facilitating a comparative analysis of their strengths,weaknesses,applications,and future development.[Result]The primary influencing factors governing the dielectric constant varied with soil types,with notable dependence on testing frequency.However,the dielectric constant remains a valuable indicator of soil water content.The soil dielectric constant models were broadly categorized into four types:theoretical,semi-empirical,empirical,and boundary models.[Conclusion]Presently,there is a dearth of research focusing on the dielectric properties and model development specific to regional soils.Enhancing model accuracy necessitates incorporating the influence of soil-phase composition,mineral composition,and microstructure on the dielectric constant.This refinement will broaden the application studies for assessing and analyzing soil physical and chemical properties based on dielectric constant testing.