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DOI	10.5194/tc-13-2439-2019
	Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method - First applications in periglacial environments
	Mudler J.; Hördt A.; Przyklenk A.; Fiandaca G.; Kumar Maurya P.; Hauck C.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2439
结束页码	2456
卷号	13 期号:9
英文摘要	The DC resistivity method is a common tool in periglacial research because it can delineate zones of large resistivities, which are often associated with frozen water. The interpretation can be ambiguous, however, because large resistivities may also have other causes, like solid dry rock. One possibility to reduce the ambiguity is to measure the frequency-dependent resistivity. At low frequencies (< 100 Hz) the corresponding method is called induced polarization, which has also been used in periglacial environments. For the detection and possibly quantification of water ice, a higher frequency range, between 100 Hz and 100 kHz, may be particularly interesting because in that range, the electrical properties of water ice exhibit a characteristic behaviour. In addition, the large frequencies allow a capacitive coupling of the electrodes, which may have logistical advantages. The capacitively coupled resistivity (CCR) method tries to combine these logistical advantages with the potential scientific benefit of reduced ambiguity. In this paper, we discuss CCR data obtained at two field sites with cryospheric influence: the Schilthorn massif in the Swiss Alps and the frozen Lake Prestvannet in the northern part of Norway. One objective is to add examples to the literature where the method is assessed in different conditions. Our results agree reasonably well with known subsurface structure: at the Prestvannet site, the transition from a frozen lake to the land is clearly visible in the inversion results, whereas at the Schilthorn site, the boundary between a snow cover and the bedrock below can be nicely delineated. In both cases, the electrical parameters are consistent with those expected from literature. The second objective is to discuss useful methodological advancements: first, we investigate the effect of capacitive sensor height above the surface and corroborate the assumption that it is negligible for highly resistive conditions. For the inversion of the data, we modified an existing 2-D inversion code originally developed for low-frequency induced polarization data by including a parametrization of electrical permittivity. The new inversion code allows the extraction of electrical parameters that may be directly compared with literature values, which was previously not possible. © Author(s) 2019.
学科领域	cryosphere; data set; induced polarization; numerical method; periglacial environment; permittivity; two-dimensional modeling; Bernese Alps; Central Alps; Norway; Schilthorn; Switzerland
语种	英语
scopus关键词	cryosphere; data set; induced polarization; numerical method; periglacial environment; permittivity; two-dimensional modeling; Bernese Alps; Central Alps; Norway; Schilthorn; Switzerland
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118836
作者单位	Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany; Department of Geoscience, Hydrogeophysics Group, Aarhus University, Aarhus, Denmark; Department of Geosciences, University of Fribourg, Fribourg, Switzerland
推荐引用方式 GB/T 7714	Mudler J.,Hördt A.,Przyklenk A.,et al. Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method - First applications in periglacial environments[J],2019,13(9).
APA	Mudler J.,Hördt A.,Przyklenk A.,Fiandaca G.,Kumar Maurya P.,&Hauck C..(2019).Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method - First applications in periglacial environments.The Cryosphere,13(9).
MLA	Mudler J.,et al."Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method - First applications in periglacial environments".The Cryosphere 13.9(2019).