频率响应下盐渍土介电特性及含盐量估算

发布时间：2018-03-04 19:12

本文选题：盐渍土　切入点：介电常数　出处：《新疆大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：文章针对新疆喀什地区盐渍土进行了介电常数室内实验,从分析盐渍土介电特性的主要影响因素入手,分别从理论和实验两方面对盐渍土的介电特性进行分析;通过含水含盐量正交测试,分别研究了土壤介电常数随含水量、含盐量的变化规律及特点,同时记录并对比盐渍土在交变电场下的响应特性,其成果对研制低成本土壤盐渍化监测节点提供了理论依据.实验结果表明:(1)针对干旱区盐渍土的含盐量反演,使用土壤介电常数优于电导率;(2)在整个激励频率区间,盐渍土的含水量和含盐量的变化都会影响土壤的极化特性,进而反演于土壤介电常数,其相关性在整个频率区域均达到极显著水平;(3)在高频区域,土壤含盐量增大使土壤介电常数增加,其增加趋势明显有差异;(4)在多数情况下,低频的激励信号使得对盐度变化的灵敏度非常低;(5)在整个频率区域不存在根据介电模型预料的可识别的含盐量相关特征曲线.
[Abstract]:In this paper, the dielectric constant of saline soil in Kashi area of Xinjiang is studied in laboratory. The main influencing factors of the dielectric property of saline soil are analyzed, and the dielectric properties of saline soil are analyzed from two aspects of theory and experiment. Based on the orthogonal test of water and salt content, the variation law and characteristics of soil dielectric constant with water content and salt content were studied, and the response characteristics of saline soil under alternating electric field were recorded and compared. The results provide a theoretical basis for the development of low-cost soil salinization monitoring nodes. The experimental results show that the use of soil dielectric constant is superior to that of electrical conductivity in the whole excitation frequency range for the inversion of salt content in saline soils in arid areas. The change of water content and salt content of saline soil will affect the polarization characteristics of soil, and then invert the soil dielectric constant. The correlation is very significant in the whole frequency region. The increase of soil salt content increases the soil dielectric constant, and its increasing trend is obviously different. The low frequency excitation signal makes the sensitivity to the salinity change very low) and there is no discernible characteristic curve of salt content in the whole frequency region as predicted by the dielectric model.
【作者单位】：上海海洋大学信息学院;喀什大学计算机科学技术学院;
【基金】：国家自然科学基金项目(61561027) 上海市自然科学基金(16ZR1415100)
【分类号】：S156.41

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