Magnetic resonance sounding applied to aquifer characterization
Magnetic resonance sounding applied to aquifer characterization
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DOI：
10.1111/j.1745-6584.2004.tb02684.x
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发表时间：
2004-05-01
期刊：
影响因子：
2.6
通讯作者：
Vouillamoz, JM
中科院分区：
文献类型：
--
作者：
Legchenko, A;Baltassat, JM;Vouillamoz, JM
磁共振测深（MRS）不同于其他用于地下水调查的地球物理工具，它测量的是直接由地下水分子产生的磁共振信号。交流脉冲给地面上的导线环通电，产生MRS信号；地下水是通过非零振幅读数来指示的，具有很高的可靠性。不同脉冲强度的测量结果揭示了含水层的深度和厚度。含水层的水力导电性也可以通过钻孔进行校准来估计。MRS既可用于预测供水井的产量，也可用于钻孔之间的插值，从而减少水文地质建模所需的钻孔数量。在法国的Kerbernez和Kerien流域，MRS结合二维电成像的实际应用证明了该技术的有效性。
Magnetic resonance sounding (MRS) is distinguished from other geophysical tools used for ground water investigation by the fact that it measures a magnetic resonance signal generated directly from subsurface water molecules. An alternating current pulse energizes a wire loop on the ground surface and the MRS signal is generated; subsurface water is indicated, with a high degree of reliability, by nonzero amplitude readings. Measurements with varied pulse magnitudes then reveal the depth and thickness of water saturated layers. The hydraulic conductivity of aquifers can also be estimated using boreholes for calibration. MRS can be used for both predicting the yield of water supply wells and for interpolation between boreholes, thereby reducing the number of holes required for hydrogeological modeling. An example of the practical application of MRS combined with two-dimensional electrical imaging, in the Kerbernez and Kerien catchments area of France, demonstrates the efficiency of the technique.