A direct comparison of EMI data and borehole data on a 1000 ha data set
A direct comparison of EMI data and borehole data on a 1000 ha data set
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1000 公顷数据集上 EMI 数据和钻孔数据的直接比较
DOI：
10.1016/j.geoderma.2017.04.028
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发表时间：
2017
期刊：
影响因子：
6.1
通讯作者：
K. Rasmussen
中科院分区：
文献类型：
--
作者：
R. R. Frederiksen;A. Christiansen;S. Christensen;K. Rasmussen
频域电磁感应（EMI）方法越来越多地用于研究不同尺度上的土壤性质和水文性质。然而，EMI数据最常被使用，因为它们是或与低感应数近似。此外，报告的研究规模相当小（< 100公顷），据我们所知，尚未报告与钻孔进行定量比较的情况。在本研究中，我们收集，处理和反演1000公顷的EMI数据集，我们直接比较的EMI数据与钻孔数据。EMI数据是以20米的线间距收集的，产生了大约110 000个经过处理的测深数据，这些数据是用完全非线性算法反演的。然后根据125个钻孔的岩性信息对EMI结果进行了评估。结果表明，在复杂的冰川沉积环境中，利用EMI仪器，我们可以在小流域尺度（1000公顷）上绘制浅层（< 6 m）结构图。通过定量分析对地质单元的绘图进行了评估，在定量分析中，我们开发了一种直接比较EMI结果和钻孔数据的一般方法。在将地质单位与测量的折射率联系起来之后，我们发现125个钻孔中有103个被EMI结果再现。我们将少数不可再现的钻孔归因于当地规模的地质单位、地质或电阻率的突然横向变化以及钻孔坐标不准确。我们的结论是，EMI可以提供必要的细节和质量的建筑输入，以表征面积高达1000公顷。
Increasingly, the frequency domain electromagnetic induction (EMI) method is used to study soil properties and hydrological properties on different scales. Yet, EMI data are most often used as they are or with the low induction number approximation. Moreover, reported studies have been fairly small (< 100 ha) and to our best knowledge quantitative comparisons with boreholes have not been reported. In the present study we collect, process and invert a 1000 ha EMI data set, and we directly compare the EMI data with borehole data. EMI data were collected with a line spacing of 20 m, resulting in approximately 110,000 processed soundings, which were inverted with a full non-linear algorithm. The EMI results were then evaluated against lithological information from 125 boreholes. The results show that with an EMI instrument we can map the shallow (< 6 m) architecture on small-catchment scale (1000s ha) in a complicated glacial sedimentary environment. The mapping of the geological units was evaluated by a quantitative analysis in which we developed a general methodology for directly comparing EMI results and borehole data. After linking geological units to measured resistivities, we found that 103 out of 125 boreholes were reproduced by the EMI results. We attributed the few non-reproducible boreholes to be caused by local scale geological units, abrupt lateral variations in either geology or resistivity, and inaccurate borehole coordinates. We conclude that EMI can provide the architectural input with the necessary detail and quality to characterize areas of up to 1000s ha.
影响因子：
6.1
作者：
Sebastian Rudolph;J. Kruk;C. Hebel;M. Ali;M. Herbst;C. Montzka;S. Pätzold;D. Robinson;H. Vereecken;L. Weihermüller
通讯作者：
Sebastian Rudolph;J. Kruk;C. Hebel;M. Ali;M. Herbst;C. Montzka;S. Pätzold;D. Robinson;H. Vereecken;L. Weihermüller