土壤水分是滨海盐渍土调控盐碱化的主要因素，无损探测技术GPR可沿测线解析土壤剖面，反演分层土壤含水量，以GPR反射波信号调查土壤水分的空间分布与变异，其工作机理与结果精确度值得深入研究。本项目通过单层次和复合层次地块剖面法模型实验，揭示GPR识别不同土体构型地块以及剖面土壤介电特性差异分层的能力，阐明电磁波传播速度、振幅能值和频谱信号对土壤水分、盐分、质地变化的响应特征，构建不同土壤盐分、质地条件下的土壤介电常数/含水量反演模型；通过剖面法-共中心点法实地实验，验证土壤介电常数/含水量的反演模型，修正模型参数，以烘干法结果为参照提高GPR反演土壤含水量的精确度，最终形成GPR与3S技术相结合模拟土壤水分空间分布的技术集成体系。本项目旨在揭示滨海盐渍土区GPR信号与土壤含水量的定量关系，阐明GPR测定土壤含水量的技术思路和参数设计，为准确实时监测土壤水盐运移、改良土壤盐渍化提供新的技术支撑。

Soil water content is the main factor controlling soil salinization in the coastal saline soil region. As one of the non-destructive detection techniques, ground penetrating radar (GPR) can interpret soil profile structure along the measuring line and inverse soil water content of different layers. For investigating the spatial distribution and variation of soil water content by GPR reflection wave signals, the working mechanism and the precision of the results are worthy of further study. Through single layer and multilayers model experiments with fixed offset (FO) method, the research would reveal the identification ability of GPR for plots with different soil body configurations and soil layers with different dielectric properties, clarify the response characteristics of electromagnetic wave velocity, amplitude values and frequency spectrum to soil water, salt and texture, construct inversion models of soil dielectric constant/soil water content under the different conditions of soil salt content and texture. Through field experiments with FO and common middle point (CMP) methods, the research would verify the inversion models of soil dielectric constant/soil water content, modify model parameters and improve the inversion accuracy of soil water content revision by comparison with the results of oven drying methods. Finally, the research would form the technology integration system combining GPR and 3S to simulate the spatial distribution of soil water..This research aims to reveal the quantitative relationship between GPR signals and soil water content in the coastal saline region and clarify the technical ideas and parameters design of GPR investigation, which would provide a new technical support for real-time monitoring the vertical migration of soil water and improving soil salinization.