Non Destructive Geophysical Monitoring of Water Content and Fluid Conductivity Anomalies in the Near Surface at the Border of an Agricultural
Non Destructive Geophysical Monitoring of Water Content and Fluid Conductivity Anomalies in the Near Surface at the Border of an Agricultural
复制标题
农业边界近地表含水量和流体电导率异常的无损地球物理监测
DOI：
10.1007/s11220-005-0005-0
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
E. Gloaguen
中科院分区：
文献类型：
--
作者：
P. Sénéchal;H. Perroud;M. Kedziorek;A. Bourg;E. Gloaguen
在本文中，我们使用先进的地球物理技术来表征和监测地下属性，如孔隙度、水含量和水的电导率。在一年的时间里，对玉米田边界的探地雷达(GPR)和电导率进行了月度测量。对多偏移距探地雷达数据进行了速度分析，以确定总孔隙度并监测水从土壤表面到地下水位的垂直运移。与经典的法向移动输出(NMO)和双线性插值法相比，采用新的和独创的探地雷达处理技术(共反射面法估计探地雷达速度，克里格法用于探地雷达速度)提高了探地雷达速度图的估计和分辨率。用电阻率确定有效孔隙率。探地雷达和电学数据的结合使得能够估计水的电导率，并突出高电导率区域，这可能是由于农业化肥的污染造成的。获得了独立的测定结果(粒度分数、电导率、水样的主要离子含量和孔隙度)，验证了我们的地球物理调查结果。这项研究证明，在导电性差的土壤中，非破坏性地球物理方法可以提供几米深以下的水的含水率、孔隙度和电导率的准确模型。
We use in this paper advanced geophysical techniques for the characterization and monitoring of subsurface properties such as porosity, water content and electrical conductivity of water. Ground Penetrating Radar (GPR) and electrical conductivity measurements were recorded monthly during one year at the border of a corn field. Velocity analyses of multioffset GPR data were conducted to determine total porosity and to monitor vertical transport of water from the soil surface to the water table. The use of novel and original techniques for GPR processing (GPR velocity estimation by the Common Reflection Surface (CRS) method, kriging applied to GPR velocity) improved the estimate and the resolution of GPR velocity maps compared with the classical Normal MoveOut (NMO) and the bi-linear interpolation. Electrical resistivities were used to determine the effective porosity. The combination of GPR and electrical data permitted to estimate the electrical conductivity of water and to highlight high conductivity zones, possibly due to contamination by agricultural fertilizers. Independent determinations (grain size fractions, electrical conductivity, major ion content of water samples and porosity) were obtained, that validate our geophysical investigation. This study demonstrates the efficiency of non destructive geophysical approaches for providing accurate models of water content, porosity and electrical conductivity of water down to a depth of several meters in a poorly conductive soil.
影响因子：
2.6
作者：
DAVIS, JL;ANNAN, AP
通讯作者：
ANNAN, AP