Resolution  capacity  of  geophysical  monitoring  regarding  permafrost  degradation induced by hydrological processes

Mewes, Benjamin; Hilbich, Christin; Delaloye, Reynald; Hauck, Christian

doi:10.5194/tc-2016-229

Cited by 6 publications

(13 citation statements)

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“…In combination with the large spatial coverage of the conducted 2-D geophysical surveys, this approach is considered to yield plausible ranges of ice and water contents for the whole rock glacier. Previous studies applying and testing the 4PM on rock glaciers showed that estimated ice and water contents can be reasonable well delineated and are in good agreement with nearby boreholes and complementary data sets 520 (Hauck et al, 2011;Mewes et al, 2017;Schneider et al, 2013).…”

Section: Geophysical Approachsupporting

confidence: 63%

“…In addition, the spatial resolution of the geophysical approach depends on the sensor spacing in the field in relation to the dimension of the observed layers and 525 anomalies causing a trade-off between the spatial coverage of the landform (profile length and investigation depth) and the resolution capacity for small scale structures in the model domain. Mewes et al (2017) showed that the resolution capacity of the 4PM is suitable to detect hydrological structures and permafrost degradation in rock glaciers with sensor spacings comparable to the spacings used in this study (Tables 2, 3). However they empasize that the resolution capacity of vertical https://doi.org/10.5194/tc-2020-29 Preprint.…”

Section: Geophysical Approachmentioning

confidence: 59%

“…Alps (Hauck et al, 2011;Mewes et al, 2017;Schneider et al, 2013). Moreover, the resolution capacity of the 4PM was tested using synthetic models and field data of rock glaciers to assess detectable changes in water and ice content due to permafrost degradation (Mewes et al, 2017). 290…”

Section: Four-phase-model (4pm)mentioning

confidence: 99%

“…However, several limitations accompanied the geophysical approach, which are mainly caused by the inherent ambiguity of ERT and SRT inversion and the uncertainties associated with the petrophysical relationships, and their free parameters, used in the 4PM (Duvillard et al, 2018;Hauck et al, 2011;Mewes et al, 2017). In addition, the spatial resolution of the geophysical approach depends on the sensor spacing in the field in relation to the dimension of the observed layers and 525 anomalies causing a trade-off between the spatial coverage of the landform (profile length and investigation depth) and the resolution capacity for small scale structures in the model domain.…”

Section: Geophysical Approachmentioning

confidence: 99%

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Ice content and interannual water storage changes of an active rock glacier in the dry Andes of Argentina

Halla¹,

Blöthe²,

Baldis³

et al. 2020

Preprint

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Abstract. The quantification of volumetric ice and water contents in active rock glaciers is necessary to estimate their role as water stores and contributors to runoff in dry mountain catchments. In the semi-arid to arid Andes of Argentina, active rock glaciers potentially constitute important water reservoirs due to their widespread distribution. Here however, water storage capacities and their interannual changes have so far escaped quantification in detailed field studies. Volumetric ice and water contents were quantified using a petrophysical four-phase model (4PM) based on complementary electrical resistivities (ERT) and seismic refraction tomographies (SRT) in different positions of Dos Lenguas rock glacier in the Upper Agua Negra basin, Argentina. We derived vertical and horizontal surface changes of the Dos Lenguas rock glacier, for the periods 2016–17 and 2017–18 using drone-derived digital elevation models (DEM). Interannual water storage changes of −36 mm yr−1 and +27 mm yr−1 derived from DEMs of Difference (DoD) for the periods 2016–17 and 2017–18, respectively, indicate that significant amounts of annual precipitation rates can be stored in and released from the active rock glacier. Heterogeneous ice and water contents show ice-rich permafrost and supra-, intra- and sub-permafrost aquifers in the subsurface. Active layer and ice-rich permafrost control traps and pathways of shallow ground water, and thus regulate interannual storage changes and water releases from the active rock glacier in the dry mountain catchment. The ice content of 1.7–2.0 × 109 kg in the active Dos Lenguas rock glacier represents an important long-term ice reservoir, just like other ground ice deposits in the vicinity, if compared to surface ice that covers less than 3 % of the high mountain catchment.

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Section: Geophysical Approachsupporting

confidence: 63%

Section: Geophysical Approachmentioning

confidence: 59%

Section: Four-phase-model (4pm)mentioning

confidence: 99%

Section: Geophysical Approachmentioning

confidence: 99%

See 2 more Smart Citations

Ice content and interannual water storage changes of an active rock glacier in the dry Andes of Argentina

Halla¹,

Blöthe²,

Baldis³

et al. 2020

Preprint

Self Cite

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“…Geophysical measurements appear to be the most efficient approach to gain such in situ data (Mewes et al, 2016) and we consider that the use of geophysical results to parameterise complex thermal modelling approaches is one of the future challenges. This will constitute a first step in modelling the thermohydromechanical processes leading to bedrock failure.…”

Section: Perspectivesmentioning

confidence: 99%

Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century

et al. 2017

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Abstract. High alpine rock wall permafrost is extremely sensitive to climate change. Its degradation has a strong impact on landscape evolution and can trigger rockfalls constituting an increasing threat to socio-economical activities of highly frequented areas; quantitative understanding of permafrost evolution is crucial for such communities. This study investigates the long-term evolution of permafrost in three vertical cross sections of rock wall sites between 3160 and 4300 m above sea level in the Mont Blanc massif, from the Little Ice Age (LIA) steady-state conditions to 2100. Simulations are forced with air temperature time series, including two contrasted air temperature scenarios for the 21st century representing possible lower and upper boundaries of future climate change according to the most recent models and climate change scenarios. The 2-D finite element model accounts for heat conduction and latent heat transfers, and the outputs for the current period (2010)(2011)(2012)(2013)(2014)(2015) are evaluated against borehole temperature measurements and an electrical resistivity transect: permafrost conditions are remarkably well represented. Over the past two decades, permafrost has disappeared on faces with a southerly aspect up to 3300 m a.s.l. and possibly higher. Warm permafrost (i.e. > −2 • C) has extended up to 3300 and 3850 m a.s.l. in N and S-exposed faces respectively. During the 21st century, warm permafrost is likely to extend at least up to 4300 m a.s.l. on S-exposed rock walls and up to 3850 m a.s.l. depth on the N-exposed faces. In the most pessimistic case, permafrost will disappear on the S-exposed rock walls at a depth of up to 4300 m a.s.l., whereas warm permafrost will extend at a depth of the N faces up to 3850 m a.s.l., but possibly disappearing at such elevation under the influence of a close S face. The results are site specific and extrapolation to other sites is limited by the imbrication of local topographical and transient effects.

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A Review on Applications of Time-Lapse Electrical Resistivity Tomography Over the Last 30 Years : Perspectives for Mining Waste Monitoring

et al. 2022

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Mining operations generate large amounts of wastes which are usually stored into large-scale storage facilities which pose major environmental concerns and must be properly monitored to manage the risk of catastrophic failures and also to control the generation of contaminated mine drainage. In this context, non-invasive monitoring techniques such as time-lapse electrical resistivity tomography (TL-ERT) are promising since they provide large-scale subsurface information that complements surface observations (walkover, aerial photogrammetry or remote sensing) and traditional monitoring tools, which often sample a tiny proportion of the mining waste storage facilities. The purposes of this review are as follows: (i) to understand the current state of research on TL-ERT for various applications; (ii) to create a reference library for future research on TL-ERT and geoelectrical monitoring mining waste; and (iii) to identify promising areas of development and future research needs on this issue according to our experience. This review describes the theoretical basis of geoelectrical monitoring and provides an overview of TL-ERT applications and developments over the last 30 years from a database of over 650 case studies, not limited to mining operations (e.g., landslide, permafrost). In particular, the review focuses on the applications of ERT for mining waste characterization and monitoring and a database of 150 case studies is used to identify promising applications for long-term autonomous geoelectrical monitoring of the geotechnical and geochemical stability of mining wastes. Potential challenges that could emerge from a broader adoption of TL-ERT monitoring for mining wastes are discussed. The review also considers recent advances in instrumentation, data acquisition, processing and interpretation for long-term monitoring and draws future research perspectives and promising avenues which could help improve the design and accuracy of future geoelectric monitoring programs in mining wastes.

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Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes

Cited by 6 publications

References 0 publications

Ice content and interannual water storage changes of an active rock glacier in the dry Andes of Argentina

Ice content and interannual water storage changes of an active rock glacier in the dry Andes of Argentina

Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century

A Review on Applications of Time-Lapse Electrical Resistivity Tomography Over the Last 30 Years : Perspectives for Mining Waste Monitoring

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