应用GPR获取水文地质参数研究初探

探地雷达(GPR)能够在不同空间尺度上采集水文地质数据来对地下特征进行详细描述,近年来被广泛应用于探测地下结构和埋藏体。本文简要介绍了GPR的工作原理、探测方式及其应用条件;探讨了GPR获取多孔介质水力参数的物理机制;分别利用50MHz和25MHz天线对同一断面进行等采样距测量,经分层标定和时间拾取,获取了沿测线非饱和带含水率及饱和带的孔隙度和渗透系数,并将结果与钻孔取样的岩性进行了对比,结果合理。

Approach to the estimation of hydrogeolgical parameters using GPR

Ground-Penetrating Radar (GPR) can collect hydrogeological data with different scales,which are needed to characterize the detailed subsurface features.This technique has widely been used to investigate subsurface structures or buried objects in recent years.The survey principle,measuring method and working environment of the GPR are briefly described in this paper.The physical theory of estimating parameters of porous materials by the GPR is also presented.Profiles colleted along one traverse using 50 MHz and 25 MHz are analyzed.Layer structures are determined based on the borehole data in one profile and the two-way travel time is picked on the other profile.The comparison of parameters estimated from GPR to property of the borehole samples shows that the GPR estimation is reasonable.The results from this study indicate that the GPR technique can be used to provide noninvasive,spatially dense estimates of parameter in shallow porous materials over large areas and in a rapid manner.