Geoelectrical properties of saline permafrost soil in the Adventdalen valley of Svalbard (Norway), constrained with in-situ well data

Tavakoli, Saman; Gilbert, Graham; Lysdahl, Asgeir Olaf Kydland; Frauenfelder, Regula; Forsberg, Cathinka Schaanning

doi:10.1016/j.jappgeo.2021.104497

Cited by 5 publications

(6 citation statements)

References 34 publications

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“…This layer was unfortunately beyond reach given depths of investigation associated with our ERT electrode configuration. Deeper DC resistivity studies have been conducted in Svalbard [64–65], imaging a shallow active layer (<3 m) above the permafrost, with resistivity values in the range observed in our work (200–400 Ω.m). However, the resistivity value range depends on how much liquid moisture is available in the near subsurface at the time of imaging.…”

Section: Discussionsupporting

confidence: 71%

Characterization of a Deglaciated Sediment Chronosequence in the High Arctic Using Near‐Surface Geoelectrical Monitoring Methods

Cimpoiasu,

Kuras,

Harrison

et al. 2024

Permafrost & Periglacial

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Accelerated climate warming is causing significant reductions in the volume of Arctic glaciers, such that previously ice‐capped bare ground is uncovered, harboring soil development. Monitoring the thermal and hydrologic characteristics of soils, which strongly affect microbial activity, is important to understand the evolution of emerging terrestrial landscapes. We instrumented two sites on the forefield of a retreating Svalbard glacier, representing sediment ages of approximately 5 and 60 years since exposure. Our instrumentation included an ERT array complemented by adjacent point sensor measurements of subsurface temperature and water content. Sediments were sampled at each location and at two more additional sites (120 and 2000 years old) along a chronosequence aligned with the direction of glacial retreat. Analysis suggests older sediments have a lower bulk density and contain fewer large minerals, which we interpret to be indicative of sediment reworking over time. Two months of monitoring data recorded during summer 2021 indicate that the 60‐year‐old sediments are stratified showing more spatially consistent changes in electrical resistivity, whereas the younger sediments show a more irregular structure, with consequences on heat and moisture conductibility. Furthermore, our sensors reveal that young sediments have a higher moisture content, but a lower moisture content variability.

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Section: Discussionsupporting

confidence: 71%

Characterization of a Deglaciated Sediment Chronosequence in the High Arctic Using Near‐Surface Geoelectrical Monitoring Methods

Cimpoiasu,

Kuras,

Harrison

et al. 2024

Permafrost & Periglacial

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“…Doyoro et al 113 provide a review of these packages. Software selection can result in slight variations in inversion results because inversion parameters and algorithms may differ 113,114 . Furthermore, the default meshes may differ between software packages, which can affect results, and various mesh styles and refinement options are generally provided.…”

Section: Data Processingmentioning

confidence: 99%

“…However, 2D surveying may not adequately capture heterogeneity across a site, and can be affected by out‐of‐plane features 141 . 2D profiles can be used to visualize 3D structures by collecting several 2D profiles and displaying them together in 3D space 114,142 or by interpolating between adjacent 2D profiles, 143 which is sometimes referred to as 2.5D surveying. 3D resistivity surveying can be approached in two main ways.…”

Section: Recent Advancesmentioning

confidence: 99%

“…Software selection can result in slight variations in inversion results because inversion parameters and algorithms may differ. 113,114 Furthermore, the default meshes may differ between software packages, which can affect results, and various mesh styles and refinement options are generally provided. Best practices for ERT mesh design are described by Day-Lewis et al, 115 and softwarespecific guidelines may be available (e.g., 111 ).…”

Section: Inversionmentioning

confidence: 99%

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Best practices for using electrical resistivity tomography to investigate permafrost

Herring,

Lewkowicz,

Hauck

et al. 2023

Permafrost & Periglacial

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Electrical resistivity tomography (ERT) is a minimally invasive geophysical method that produces a model of subsurface resistivity from a large number of electrical resistance measurements. Strong resistivity contrasts usually exist between frozen and unfrozen earth materials, making ERT an effective and increasingly utilized tool in permafrost research. In this paper, we review more than 300 scientific publications dating from 2000 to 2022 to identify the capabilities and limitations of ERT for permafrost applications. The annual publication rate has increased by a factor of 10 over this period, but several unique challenges remain, and best practices for acquiring, processing, and interpreting ERT data in permafrost environments have not been clearly established. In this paper, we make recommendations for ERT surveys of permafrost and highlight recent advances in the field, with the objective of maximizing the utility of existing and future surveys.

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“…Adventdalen is therefore a depositional environment, with a rapid rate of sedimentation producing a succession of aeolian, deltaic and glaciomarine sediments on the valley bottom (Gilbert et al, 2018). These fine-grained sediments are approximately 60-70 m thick (Braathen et al, 2012), and are characterised by a high porosity (35 -55%) and low hydraulic conductivity (Tavakoli et al, 2021).…”

Section: Adventdalenmentioning

confidence: 99%

Integrated Geophysical Investigations of a Methane Releasing Pingo in a Changing Permafrost Environment, Svalbard

Hammock¹

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Geoelectrical properties of saline permafrost soil in the Adventdalen valley of Svalbard (Norway), constrained with in-situ well data

Cited by 5 publications

References 34 publications

Characterization of a Deglaciated Sediment Chronosequence in the High Arctic Using Near‐Surface Geoelectrical Monitoring Methods

Characterization of a Deglaciated Sediment Chronosequence in the High Arctic Using Near‐Surface Geoelectrical Monitoring Methods

Best practices for using electrical resistivity tomography to investigate permafrost

Integrated Geophysical Investigations of a Methane Releasing Pingo in a Changing Permafrost Environment, Svalbard

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