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Time-dependent magnetometric resistivity anomalies of groundwater contamination: Synthetic results from computational hydro-geophysical modeling 被引量:5
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作者 朱凯光 杨建文 《Applied Geophysics》 SCIE CSCD 2008年第4期322-330,共9页
We present a forward-modeling investigation of time-dependent ground magnetometric resistivity (MMR) anomalies associated with transient leachate transport in groundwater systems. Numerical geo-electrical models are... We present a forward-modeling investigation of time-dependent ground magnetometric resistivity (MMR) anomalies associated with transient leachate transport in groundwater systems. Numerical geo-electrical models are constructed based on the hydrological simulation results of leachate plumes from a highly conceptualized landfill system and the resultant MMR responses are computed using a modified finite difference software MMR2DFD. Three transmitter configurations (i.e., single source, MMR-TE, and MMR-TM modes) and two hydrological models (i.e., uniform and faulted porous media) are considered. Our forward modeling results for the uniform porous medium indicates that the magnetic field components perpendicular to the dominant current flow contain the most information of the underground targets and the MMR-TE mode is an appropriate configuration for detecting contaminant plumes. The modeling experiments for the faulted porous medium also confirm that the MMR method is capable of mapping and monitoring the extent of contaminant plumes in aroundwater systems. 展开更多
关键词 TIME-DEPENDENT magnetometric resistivity leachate plumes hydro-geophysicalmodeling
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Design and optimization of vector coil sensor suited to magnetometric resistivity method 被引量:1
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作者 SONG Shuang SUN De-li +1 位作者 CHEN Chao TENG Fei 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第1期45-53,共9页
Magnetometric resistivity(MMR)method is a new way to detect dam leakage.The coil sensor is generally used to collect data in geophysical exploration methods.Given the characteristics of accurate vector data requiremen... Magnetometric resistivity(MMR)method is a new way to detect dam leakage.The coil sensor is generally used to collect data in geophysical exploration methods.Given the characteristics of accurate vector data requirements and high sensitivity requirement,a three-component MMR air-core coil sensor is designed.Through the analysis of sensor sensitivity and coil structure parameters,the coil structure and turn number are designed.By analyzing the noise source of the sensor,a suitable amplifier is selected to reduce the background noise of the system.Through the analysis of the three-component non-orthogonal angles,the parameters of the non-orthogonal angles of the coils are corrected.Finally,a three-component MMR induction magnetic field sensor is designed.The volume of the sensor is controlled at 0.027 m 3.The background noise of X、Y and Z are 5.030435 nV/Hz@380 Hz and magnetic field sensitivities are 0.18995 pT/Hz@380 Hz.The three channels have good consistency,and the three-component nonorthogonal angles correction error of three components is controlled within 0.2%. 展开更多
关键词 magnetometric resistivity(MMR) three-component air-core coil sensor noise analysis high sensitivity three-component correction
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