This paper presents the results of field investigations conducted during the establishment of the permafrost site of the Norwegian GeoTest Sites (NGTS) project. The soil investigation methods used include total sounding, drilling, and sampling with a conventional auger and core and piston sampling. The installation methods for measuring ground temperatures with thermistor strings are also presented. Field investigations and instrumentation have allowed the characterization of continuous soil profiles under rather challenging geotechnical conditions at the site, with layers that include cryopegs. The quality of the retrieved core samples is sufficient for proper characterization of the presence of ground ice and determination of the soil composition and provide specimens that can be used for uniaxial compression tests. The chosen methodologies and results of this field investigation may be of interest to other investigators who are planning work under challenging conditions at sites with saline soils and/or permafrost settings, where the soil is a few degrees below the freezing point and unfrozen soils are present in the strata. In addition, to complete the geocryological characterization of the site, measurements of permafrost temperatures at the site from 2018 to 2024 are presented.
Citation: Anatoly O Sinitsyn, Stein O Christensen, Graham L Gilbert, Trond E Larsen, Kjartan Følke, Arne Aalberg, Aleksey Shestov. Field investigations at the NGTS permafrost site: Methodologies, experiences, and results[J]. AIMS Geosciences, 2026, 12(1): 52-73. doi: 10.3934/geosci.2026002
This paper presents the results of field investigations conducted during the establishment of the permafrost site of the Norwegian GeoTest Sites (NGTS) project. The soil investigation methods used include total sounding, drilling, and sampling with a conventional auger and core and piston sampling. The installation methods for measuring ground temperatures with thermistor strings are also presented. Field investigations and instrumentation have allowed the characterization of continuous soil profiles under rather challenging geotechnical conditions at the site, with layers that include cryopegs. The quality of the retrieved core samples is sufficient for proper characterization of the presence of ground ice and determination of the soil composition and provide specimens that can be used for uniaxial compression tests. The chosen methodologies and results of this field investigation may be of interest to other investigators who are planning work under challenging conditions at sites with saline soils and/or permafrost settings, where the soil is a few degrees below the freezing point and unfrozen soils are present in the strata. In addition, to complete the geocryological characterization of the site, measurements of permafrost temperatures at the site from 2018 to 2024 are presented.
| [1] | L'Heureux JS, Carroll R, Lacasse S, et al. (2017) New Research Benchmark Test Sites in Norway, Geotechnical Frontiers 2017, 631–640. |
| [2] |
Gilbert GL, Instanes A, Sinitsyn AO, et al. (2019) Characterization of two sites for geotechnical testing in permafrost: Longyearbyen, Svalbard. AIMS Geosci 5: 868–885. https://doi.org/10.3934/geosci.2019.4.868 doi: 10.3934/geosci.2019.4.868
|
| [3] | van Everdingen RO (2005) Muli-Language Glossary of Permafrost and Related Ground-Ice Terms. Calgary, Alberta, Canada International Permafrost Association. https://doi.org/10.4224/20386561 |
| [4] | Christensen SO (2018) Norwegian GeoTest Sites (NGTS). Geotechnical site investigations, Svalbard. Field report—Permafrost site—Advendalen. SINTEF. 42. |
| [5] | Christensen SO (2018) Norwegian GeoTest Sites (NGTS). Geotechnical site investigations, Svalbard. Field report—Permafrost sites—Advendalen/UNIS East. SINTEF. 38. |
| [6] | Bæverfjord MG, Gylland G, Sinitsyn A, et al. (2015) Soil Investigations for Sustainable Foundations in Arctic Coastal Areas. Proceedings of the XVI ECSMGE Geotechnical Engineering for Infrastructure and Development, Edinburgh, 1243–1248. |
| [7] | Gilbert GL (2014) Sedimentology and geocryology of an Arctic fjord head delta (Adventdalen, Svalbard). MSc thesis. University of Oslo. 133. |
| [8] | Lecomte I, Polom U, Sauvin G, et al. (2014) Shear-wave Reflection-seismic Pilot Study at the UNIS CO2 Lab site, Longyearbyen, Svalbard. 76th EAGE Conference and Exhibition 2014, European Association of Geoscientists & Engineers. 2014: 1–5. https://doi.org/10.3997/2214-4609.20141243 |
| [9] | Wold M, Bæverfjord MG (2013) Testing of different methods for sampling coarse soils in warm coastal permafrost. Proceedings of the 22nd International Conference on Port and Ocean Engineering under Arctic Conditions, Espoo, Finland. |
| [10] | Gilbert GL, Christiansen HH, Neumann U (2015) Coring of unconsolidated permafrost deposits: methodological successes and challenges. Proceedings GeoQuébec 2015–68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference, GEOQuebec 2015. |
| [11] | Norwegian Polar Institute. TopoSvalbard, 2018. Available from: https://toposvalbard.npolar.no/. |
| [12] | Håndbok R211 (2014) Feltundersøkelser. Statens vegvesens. Available from: https://www.vegvesen.no/globalassets/fag/handboker/hb-n200-september-2014.pdf?v = 499464. |
| [13] | Husdal E (2011) The application of modified total sounding techniques in frozen ground. Master's thesis, Norges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for bygg, anlegg og transport. |
| [14] | Hvorslev MJ, Goode TB (1963) Core drilling in frozen soils. Lafayette, Indiana. 364–371. Available from: https://www.permafrost.org/wp-content/uploads/ConferenceMaterials/01st-International-Conference-on-Permafrost-Proceedings-Lafayette-Indianna-1966.pdf. |
| [15] | Reimers S (1980) Drilling and sampling in frozen ground. North Eng 12: 13–17. |
| [16] | Riddle CH, Hardcastle PK (1991) Drilling and Sampling of Permafrost for Site Investigation Purposes: A Review. SPE International Arctic Technology Conference, 611–620. https://doi.org/10.2118/22139-MS |
| [17] | Brockett BE, Lawson DE (1985) Prototype drill for core sampling fine-grained perennially frozen ground, CRREL. |
| [18] | Saito T, Yoshikawa K (2008) Portable Drilling for Frozen Coarse-grained Material. 9th International Conference on Permafrost, 1561–1566. |
| [19] | Lange GR (1973) An investigation of core drilling in perennially frozen gravels and rock. US Army Cold Regions Research and Engineering Laboratory. Technical Report 245 Technical Report 245. 28. |
| [20] | Sellmann PV, Mellor M (1986) Drill bits for frozen fine-grained soil. US Army Cold Regions Research and Engineering Laboratory, CRREL special report 86–27. |
| [21] | Dickinson W, Cooper P, Webster B, et al. (1999) A portable drilling rig for coring permafrsoted sediments. J Sediment Res 69: 518–527. |
| [22] |
Calmels F, Gardon O, Allard M (2005) A portable earth-drill system for permafrost studies. Permafrost Periglac Process 16: 311–315. https://doi.org/10.1002/ppp.529 doi: 10.1002/ppp.529
|
| [23] | Sinitsyn A, Larsen TE, Følke K (2025) Images of permafrost soil samples obtained at the NGTS Permafrost site, Longyeabyen, Svalbard. https://doi.org/10.5281/zenodo.16792570 |
| [24] | Kåsin K, Kirkevolden OV, Instanes A, et al. (2016) Standardization of in situ tests and field work. Available from: https://www.researchgate.net/publication/340862055_Norwegian_Geo-Test_Sites_NGTS_Standardization_of_in_situ_tests_and_field_work. |
| [25] | Paro L, Gugliemin M (2011) Handbook to establish alpine permafrost monitoring network. |
| [26] | Klein CA, Wilson CR, Benson BD, et al. (1968) Installation of thermistor strings in test borings: a comparison of methods and results. Cold Regions Engineering. American Society of Civil Engineers (ASCE), New York, 200–206. |
| [27] |
Ladanyi B, Lunne T, Vergobbi P, et al. (1995) Predicting creep settlements of foundations in permafrost from the results of cone penetration tests. Can Geotech J 32: 835–847. https://doi.org/10.1139/t95-080 doi: 10.1139/t95-080
|
| [28] | GOST 25358-2012, Grunty. Metod polevogo opredeleniya temperatury (Soils. Field temperature determination method). 2012. Available from: https://base.garant.ru/. |
| [29] | Christiansen HH, GL Gilbert GL, Demidov N, et al. (2019) Permafrost thermal snapshot and active-layer thickness in Svalbard 2016–2017. SESS Report. |
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Figures(7) / Tables(3)
Anatoly O Sinitsyn, Stein O Christensen, Graham L Gilbert, Trond E Larsen, Kjartan Følke, Arne Aalberg, Aleksey Shestov. Field investigations at the NGTS permafrost site: Methodologies, experiences, and results[J]. AIMS Geosciences, 2026, 12(1): 52-73. doi: 10.3934/geosci.2026002
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