高频电磁波传播速度在水及淤积砂土中影响因素实验研究  

Research on influence factors of GPR wave velocity in water and sandy soil in laboratory

作　　者：郭秀军[1] 王淼[1] 张刚[2] 孙振水 兰锡军 蒋甫伟[1] 

机构地区：[1]中国海洋大学环境科学与工程学院,青岛266100 [2]山东省交通厅基本建设工程质量监督站,济南271000 [3]青岛市水利局,青岛266000

出　　处：《地球物理学进展》2010年第5期1820-1824,共5页Progress in Geophysics

基　　金：国家自然科学基金(40706020);青岛市水利科技创新项目(2006001)联合资助

摘　　要：水及淤积土中电磁波传播速度是实现水上探地雷达(GPR)探测数据准确时深转换的关键因素.论文基于探地雷达实测结果分析了水温、盐度、浊度对水中电磁波速的影响和粒径组成、含水量变化对砂土介电常数(电磁波速)的影响,建立了淤积砂土介电常数模型并给出了相应速度计算方法.研究表明水中电磁波速主要受水体盐度影响,随盐度增大而指数减小.淤积砂土介电常数符合Looyenga模型,现场探测时可根据土样三相体积比确定土体介电常数,进而确定土体电磁波速,实现GPR数据时深准确转换.GPR wave propagation velocity is the key factor in time-depth translating in GPR data processing. Based on the analysis of test data in laboratory, this paper gives the normal GPR wave speed curve with the temperature, salinity, turbidity variation in water, and that of particle grade or water content of sandy soil; establishes the dielectric constant model of sandy soil and presents the corresponding speed calculating method. The research shows the GPR wave propagation velocity in water decreases with the salinity increasing. The dielectric constant model of sandy soil agrees with Looyenga formula, which reflects the dielectric constant of sandy soil due to bulk content and permittivity of components.

关 键 词：探地雷达 水深 淤泥层厚度 高分辨率信息处理技术 速度模型 

分 类 号：P631[天文地球—地质矿产勘探]