Journal ArticleDOI
Prospecting frost‐wedge pseudomorphs and their polygonal network using the electromagnetic induction sensor EM38DD
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TLDR
In this paper, the authors used EM38DD to locate near-surface Pleistocene frost-wedge pseudomorphs at a test site where a polygonal network was exposed.Abstract:
Electromagnetic induction was used to locate near-surface Pleistocene frost-wedge pseudomorphs at a test site where a polygonal network was exposed. The soil apparent electrical conductivity (ECa) was measured simultaneously with the EM38DD in the vertical and horizontal orientation, allowing the profile ratio (PR) to be calculated. Based on a fuzzy k-means classification the PR map was classified into two zones with a mean PR difference of 10%. A detailed drawing of the polygonal network served as a validation. A cross-tabulation yielded an overall accuracy of 81% when only wedges wider than 0.25 m wide were considered. The overall accuracy increased to 83% by introducing an uncertainty zone. Due to differences in composition between the wedge fillings and the host material, the PR was found to be a useful indicator of these phenomena. Copyright © 2006 John Wiley & Sons, Ltd.read more
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Advances in geophysical methods for permafrost investigations
TL;DR: In this paper, a review of the geophysical methods most frequently applied in mountain and arctic/subarctic lowland permafrost investigations is presented, focusing on the tomographic capabilities of geophysical techniques.
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Comparing the EM38DD and DUALEM-21S Sensors for Depth-to-Clay Mapping
TL;DR: In this paper, two electromagnetic induction sensors were evaluated on their capacity to map small-scale variations of the depth to the interface (z in ) in a two-layered soil.
Journal ArticleDOI
Landform characterization using geophysics—Recent advances, applications, and emerging tools
TL;DR: In this paper, the authors present an overview of the strengths and limitations of existing and emerging geophysical tools for landform studies, including ground-penetrating radar (GPR), electrical resistivity (ER), seismics, and electromagnetic induction.
Journal Article
Landform characterization using geophysics—Recent advances, applications, and emerging tools
TL;DR: For a review of the current state-of-the-art in terrestrial landform characterization, see as mentioned in this paper, where the authors present an overview of existing and emerging geophysical tools for landform studies.
Journal ArticleDOI
Reconstructing the paleotopography beneath the loess cover with the aid of an electromagnetic induction sensor
TL;DR: In this article, a non-linear relationship between the apparent electrical conductivity (ECa) measured by the vertical dipole orientation of the EM38DD and the depth to a Tertiary clay substrate was found.
References
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Book
Geostatistics for natural resources evaluation
TL;DR: In this article, an advanced-level introduction to geostatistics and Geostatistical methodology is provided, including tools for description, quantitative modeling of spatial continuity, spatial prediction, and assessment of local uncertainty and stochastic simulation.
Journal ArticleDOI
Geostatistics for Natural Resources Evaluation
TL;DR: This paper presents a meta-modelling framework that automates the very labor-intensive and therefore time-heavy and expensive process of manually cataloging and estimating the effects of noise in a discrete-time model.
Journal ArticleDOI
Noninvasive Soil Water Content Measurement Using Electromagnetic Induction
TL;DR: In this paper, the feasibility of soil water content measurement using electromagnetic induction was investigated in an arid region of southern New Mexico, where soil water measurements were taken monthly with a neutron probe at 65 equally spaced stations along a 1950-m transect.
Journal ArticleDOI
A continuum approach to soil classification by modified fuzzy k‐means with extragrades
TL;DR: A centroidal grouping method, fuzzy k-means with extragrades, which quantifies the intragrading and extrag rading of soil individuals is described in this paper.
Journal ArticleDOI
Permafrost changes in Europe during the last glacial
Jef Vandenberghe,Albert Pissart +1 more
TL;DR: In this article, a much more refined evolution of the palaeoclimate of the last glacial has been established, thanks to a considerable increase in registered periglacial indicators, a better understanding of the corresponding climate conditions, and more accurate and reliable dating of the Periglacial phenomena.