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Capacitive resistivity inversion using effective dipole lengths for line antennas

机译:使用有效偶极子长度的线性天线进行电容电阻率反演

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摘要

Non-contacting capacitively-coupled resistivity (CCR) surveys find application in permafrost investigations and investigations over engineered surfaces. However, we observe discrepancies between line-antenna CCR data and galvanic resistivity (GR) data. Inverse models recovered from the different data types exhibit differences in both resistivity magnitude and structure. We apply and test the concept of effective dipole length for line-antenna CCR data collected over permafrost terrain in Iqaluit, Nunavut. We compare inversions of corrected CCR data to the GR counterpart. Results show that correcting CCR data with an effective dipole length of 80% of the physical antenna length results in a resistivity model most in accordance with the GR model. After correction, the CCR model does not precisely emulate the GR model; potential sources of remaining discrepancy are incomplete representation of the line-antenna nature of the CCR data and the realities of field data acquisition including significantly different noise levels and the potential violation of CCR operating conditions.
机译:非接触电容耦合电阻率(CCR)测量可用于多年冻土调查和工程表面调查。但是,我们观察到线天线CCR数据和电流电阻率(GR)数据之间的差异。从不同数据类型恢复的反演模型在电阻率大小和结构上都表现出差异。我们应用并测试了在努纳武特州伊卡卢伊特的多年冻土地形上收集的线天线CCR数据有效偶极长度的概念。我们将校正后的CCR数据与GR对应物的反演进行比较。结果表明,以有效偶极子长度为物理天线长度的80%校正CCR数据,可以得到最符合GR模型的电阻率模型。校正后,CCR模型不能精确地模拟GR模型。可能存在差异的潜在原因是CCR数据的线天线性质和现场数据采集的实际情况的不完整表示,包括明显不同的噪声水平和对CCR工作条件的潜在违反。

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