{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T15:14:17Z","timestamp":1773069257897,"version":"3.50.1"},"reference-count":50,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,1,6]],"date-time":"2021-01-06T00:00:00Z","timestamp":1609891200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"publisher","award":["2016-4286"],"award-info":[{"award-number":["2016-4286"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"publisher","award":["477155"],"award-info":[{"award-number":["477155"]}],"id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100012258","name":"Polar Knowledge Canada","doi-asserted-by":"publisher","award":["NST-1718-0017"],"award-info":[{"award-number":["NST-1718-0017"]}],"id":[{"id":"10.13039\/100012258","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Polar Continental Shelf Program","award":["64316"],"award-info":[{"award-number":["64316"]}]},{"name":"Polar Continental Shelf Program","award":["67817"],"award-info":[{"award-number":["67817"]}]},{"DOI":"10.13039\/501100000196","name":"Canada Foundation for Innovation","doi-asserted-by":"publisher","award":["36803"],"award-info":[{"award-number":["36803"]}],"id":[{"id":"10.13039\/501100000196","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Ice-rich permafrost landscapes are sensitive to ongoing changes in climate. Permafrost retrogressive thaw slumps (RTSs) represent one of the more abrupt and prolonged disturbances, which occur along Arctic river and lake shorelines. These features impact local travel and infrastructure, and there are many questions regarding associated impacts on biogeochemical cycling. Predicting the duration and magnitude of impacts requires that we enhance our knowledge of RTS geomorphological drivers and rates of change. Here we demonstrate the utility of remotely piloted aircraft systems (RPAS) for documenting the volumetric change, associated drivers and potential impacts of the largest active RTS along the Old Crow River in Old Crow Flats, Yukon, Canada. RPAS surveys revealed that 29,174 m3 of sediment was exported during the initial evacuation in June 2016 and an additional 18,845 m3 continued to be exported until June 2019. More sediment export occurred during the warmer 2017 summer that experienced less cumulative rainfall than summer 2018. However, several rain events during 2017 were of higher intensity than during 2018. Overall mean soil organic carbon (SOC) and total nitrogen (TN) within sampled thaw slump sediment was 1.36% and 0.11%, respectively. A combination of multispectral, thermal and irradiance (derived from the RPAS digital surface model) data provided detailed classification of thaw slump floor terrain types including raised dry clay lobes, shaded and relatively stable, and low-lying evacuation-prone sediments. Notably, the path of evacuation-prone sediments extended to a series of ice wedges in the northern headwall, where total irradiance was highest. Using thaw slump floor mean SOC and TN values in conjunction with sediment bulk density and thaw slump fill volume, we estimated that 713 t SOC and 58 t TN were exported to the Old Crow River during the three-year study. Findings showcase the utility of high-resolution RPAS datasets for refining our knowledge of thaw slump geomorphology and associated impacts.<\/jats:p>","DOI":"10.3390\/rs13020171","type":"journal-article","created":{"date-parts":[[2021,1,6]],"date-time":"2021-01-06T20:45:42Z","timestamp":1609965942000},"page":"171","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Detailed Characterization and Monitoring of a Retrogressive Thaw Slump from Remotely Piloted Aircraft Systems and Identifying Associated Influence on Carbon and Nitrogen Export"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3183-6092","authenticated-orcid":false,"given":"Kevin W.","family":"Turner","sequence":"first","affiliation":[{"name":"Department of Geography and Tourism Studies, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4024-7772","authenticated-orcid":false,"given":"Michelle D.","family":"Pearce","sequence":"additional","affiliation":[{"name":"Department of Geography and Tourism Studies, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON L2S 3A1, Canada"}]},{"given":"Daniel D.","family":"Hughes","sequence":"additional","affiliation":[{"name":"Canadian Wildlife Health Cooperative, University of Guelph, 50 Stone Road E, Guelph, ON N1G 2W1, Canada"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"L06502","DOI":"10.1029\/2007GL032433","article-title":"Increasing rates of retrogressive thaw slump activity in the Mackenzie Delta region, NWT, Canada","volume":"35","author":"Lantz","year":"2008","journal-title":"Geophys. Res. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"108","DOI":"10.1002\/ppp.1779","article-title":"Advances in Thermokarst Research","volume":"24","author":"Kokelj","year":"2013","journal-title":"Permafr. Periglac. Process."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"56","DOI":"10.1016\/j.gloplacha.2015.02.008","article-title":"Increased precipitation drives mega slump development and destabilization of ice-rich permafrost terrain, northwestern Canada","volume":"129","author":"Kokelj","year":"2015","journal-title":"Glob. Planet. Chang."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"034025","DOI":"10.1088\/1748-9326\/11\/3\/034025","article-title":"Acceleration of thaw slump activity in glaciated landscapes of the Western Canadian Arctic","volume":"11","author":"Segal","year":"2016","journal-title":"Environ. Res. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1111\/j.1541-0064.1990.tb01092.x","article-title":"Retrogressive thaw slumps","volume":"34","author":"Burn","year":"1990","journal-title":"Can. Geogr."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"84","DOI":"10.1016\/j.geomorph.2006.07.040","article-title":"Fifty years of coastal erosion and retrogressive thaw slump activity on Herschel Island, southern Beaufort Sea, Yukon Territory, Canada","volume":"95","author":"Lantuit","year":"2008","journal-title":"Geomorphology"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1077","DOI":"10.1139\/e87-105","article-title":"Headwall retreat of ground-ice slumps, Banks Island, Northwest Territories","volume":"24","author":"Lewkowicz","year":"1987","journal-title":"Can. J. Earth Sci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/S0921-8181(00)00072-2","article-title":"Thermokarst sediments and sedimentary structures, Tuktoyaktuk Coastlands, western Arctic Canada","volume":"28","author":"Murton","year":"2001","journal-title":"Glob. Planet. Chang."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1002\/ppp.666","article-title":"Climatic and geomorphic factors affecting contemporary (1950\u20132004) activity of retrogressive thaw slumps on the Aklavik Plateau, Richardson Mountains, NWT, Canada","volume":"21","author":"Lacelle","year":"2010","journal-title":"Permafr. Periglac. Process."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1002\/ppp.1731","article-title":"Modern and Late Holocene Retrogressive Thaw Slump Activity on the Yukon Coastal Plain and Herschel Island, Yukon Territory, Canada","volume":"23","author":"Lantuit","year":"2012","journal-title":"Permafr. Periglac. Process."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1016\/j.geomorph.2015.01.024","article-title":"Distribution and growth of thaw slumps in the Richardson Mountains\u2013Peel Plateau region, northwestern Canada","volume":"235","author":"Lacelle","year":"2015","journal-title":"Geomorphology"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"79","DOI":"10.1016\/j.geomorph.2019.05.020","article-title":"Recent acceleration of thaw slumping in permafrost terrain of Qinghai-Tibet Plateau: An example from the Beiluhe Region","volume":"341","author":"Luo","year":"2019","journal-title":"Geomorphology"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"549","DOI":"10.5194\/tc-12-549-2018","article-title":"Sub-seasonal thaw slump mass wasting is not consistently energy limited at the landscape scale","volume":"12","author":"Zwieback","year":"2018","journal-title":"Cryosphere"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1329","DOI":"10.1038\/s41467-019-09314-7","article-title":"Extremes of summer climate trigger thousands of thermokarst landslides in a High Arctic environment","volume":"10","author":"Lewkowicz","year":"2019","journal-title":"Nat. Commun."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"4297","DOI":"10.5194\/bg-10-4297-2013","article-title":"Short- and long-term thermo-erosion of ice-rich permafrost coasts in the Laptev Sea region","volume":"10","author":"Overduin","year":"2013","journal-title":"Biogeosciences"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"150","DOI":"10.1007\/s12665-020-8895-7","article-title":"Multisensory satellite observations of the expansion of the Batagaika crater and succession of vegetation in its interior from 1991 to 2018","volume":"79","author":"Vadakkedath","year":"2020","journal-title":"Environ. Earth Sci."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"van der Sluijs, J., Kokelj, S.V., Fraser, R.H., Tunnicliffe, J., and Lacelle, D. (2018). Permafrost Terrain Dynamics and Infrastructure Impacts Revealed by UAV Photogrammetry and Thermal Imaging. Remote Sens., 10.","DOI":"10.3390\/rs10111734"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Swanson, D.K., and Nolan, M. (2018). Growth of retrogressive thaw slumps in the Noatak Valley, Alaska, 2010\u20132016, measured by airborne photogrammetry. Remote Sens., 10.","DOI":"10.3390\/rs10070983"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2347","DOI":"10.1111\/j.1365-2427.2010.02450.x","article-title":"Effects of retrogressive permafrost thaw slumping on sediment chemistry and submerged macrophytes in Arctic tundra lakes","volume":"55","author":"Mesquita","year":"2010","journal-title":"Freshw. Biol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"1484","DOI":"10.1002\/lno.10110","article-title":"Effects of permafrost degradation on water and sediment quality and heterotrophic bacterial production of Arctic tundra lakes: An experimental approach","volume":"60","author":"Moquin","year":"2015","journal-title":"Limnol. Oceanogr."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1111\/fwb.12061","article-title":"Biological responses to permafrost thaw slumping in Canadian Arctic lakes: Aquatic biota response to permafrost thaw","volume":"58","author":"Thienpont","year":"2013","journal-title":"Freshw. Biol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1002\/hyp.7196","article-title":"Impacts of permafrost degradation on arctic river biogeochemistry","volume":"23","author":"Frey","year":"2009","journal-title":"Hydrol. Process."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"5487","DOI":"10.5194\/bg-14-5487-2017","article-title":"Retrogressive thaw slumps temper dissolved organic carbon delivery to streams of the Peel Plateau, NWT, Canada","volume":"14","author":"Littlefair","year":"2017","journal-title":"Biogeosciences"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"5738","DOI":"10.1111\/gcb.14448","article-title":"Linking permafrost thaw to shifting biogeochemistry and food web resources in an arctic river","volume":"24","author":"Kendrick","year":"2018","journal-title":"Glob. Chang. Biol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"358","DOI":"10.1002\/ppp.2057","article-title":"Landscape matters: Predicting the biogeochemical effects of permafrost thaw on aquatic networks with a state factor approach","volume":"31","author":"Tank","year":"2020","journal-title":"Permafr. Periglac. Process."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"212","DOI":"10.1016\/j.earscirev.2019.02.018","article-title":"Effects of changing permafrost conditions on hydrological processes and fluvial fluxes","volume":"191","author":"Lamoureux","year":"2019","journal-title":"Earth-Sci. Rev."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1038\/nature14338","article-title":"Climate change and the permafrost carbon feedback","volume":"520","author":"Schuur","year":"2015","journal-title":"Nature"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/j.earscirev.2017.07.007","article-title":"Deep Yedoma permafrost: A synthesis of depositional characteristics and carbon vulnerability","volume":"172","author":"Strauss","year":"2017","journal-title":"Earth-Sci. Rev."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1038\/480032a","article-title":"Climate change: High risk of permafrost thaw","volume":"480","author":"Schuur","year":"2011","journal-title":"Nature (Comment)"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"6573","DOI":"10.5194\/bg-11-6573-2014","article-title":"Estimated stocks of circumpolar permafrost carbon with quantified uncertainty ranges and identified data gaps","volume":"11","author":"Hugelius","year":"2014","journal-title":"Biogeosciences"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"92","DOI":"10.1002\/ppp.1881","article-title":"Effect of Terrain Characteristics on Soil Organic Carbon and Total Nitrogen Stocks in Soils of Herschel Island, Western Canadian Arctic","volume":"28","author":"Obu","year":"2015","journal-title":"Permafr. Periglac. Process."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"5377","DOI":"10.1038\/s41467-019-13361-5","article-title":"Integrating hydrology and biogeochemistry across frozen landscapes","volume":"10","author":"Vonk","year":"2019","journal-title":"Nat. Commun."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1191\/0959683602hl517rp","article-title":"Response of the Porcupine and Old Crow rivers in northern Yukon, Canada, to Holocene climatic change","volume":"12","author":"Lauriol","year":"2002","journal-title":"Holocene"},{"key":"ref_34","unstructured":"Pix4D (2020, December 24). Error Estimation in Volume Calculation. Available online: https:\/\/support.pix4d.com\/hc\/en-us\/articles\/202559219-Error-estimation-in-volume-calculation."},{"key":"ref_35","unstructured":"Petras, V., and Petrasova, A. (2020, June 04). GRASS GIS r.Sun.Daily Add-on Module. (Updated 2020). Available online: https:\/\/grass.osgeo.org\/grass78\/manuals\/addons\/r.sun.hourly.html."},{"key":"ref_36","unstructured":"Hofierka, J., and Marcel, S. (2020, June 04). GRASS GIS r.Sun Manual. (Updated 2020). Available online: https:\/\/grass.osgeo.org\/grass78\/manuals\/r.sun.html."},{"key":"ref_37","unstructured":"Wen, T. (2020, June 04). GRASS GIS r.Kappa Add-on Manual. (Updated 2020). Available online: https:\/\/grass.osgeo.org\/grass78\/manuals\/r.kappa.html."},{"key":"ref_38","unstructured":"Cho, H. (2000). GIS Hydrological Modeling System by Using Programming Interface of GRASS. [Master\u2019s Thesis, Kyungpook National University, Daegu, Korea]."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1002\/hyp.3360050103","article-title":"Digital Terrain Modelling: A Review of Hydrological, Geomorphological, and Biological Applications","volume":"5","author":"Moore","year":"1991","journal-title":"Hydrol. Process."},{"key":"ref_40","unstructured":"Caplan, J., Ruesink, M., and Mit\u00e1\u0161ov\u00e1, H. (2020, June 04). GRASS GIS r.Flow Add-on Manual. (Updated 2019). University of Illinois at Urbana-Champaign. Available online: https:\/\/grass.osgeo.org\/grass79\/manuals\/r.flow.html."},{"key":"ref_41","first-page":"373","article-title":"Carbon and oxygen isotope analysis of lake sediment cellulose: Methods and applications","volume":"Volume 2","author":"Last","year":"2001","journal-title":"Tracking Environmental Change in Lake Sediments: Physical and Geochemical Methods"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1106","DOI":"10.1002\/2013JF002889","article-title":"Timing of retrogressive thaw slump initiation in the Noatak Basin, northwest Alaska, USA","volume":"119","author":"Balser","year":"2014","journal-title":"J. Geophys. Res. Earth Surf."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"30313","DOI":"10.3402\/polar.v35.30313","article-title":"Relation between planimetric and volumetric measurements of permafrost coast erosion: A case study from Herschel Island, western Canadian Arctic","volume":"35","author":"Obu","year":"2016","journal-title":"Polar. Res."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1002\/ppp.642","article-title":"Origin and polycyclic behaviour of tundra thaw slumps, Mackenzie Delta region, Northwest Territories, Canada","volume":"20","author":"Kokelj","year":"2009","journal-title":"Permafr. Periglac. Process."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"361","DOI":"10.5194\/isprsarchives-XL-1-W4-361-2015","article-title":"UAV photogrammetry for mapping and monitoring of northern permafrost landscapes","volume":"1","author":"Fraser","year":"2015","journal-title":"Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"827","DOI":"10.1139\/as-2018-0016","article-title":"Thaw slump activity measured using stationary cameras in time-lapse and Structure-from-Motion photogrammetry","volume":"4","author":"Armstrong","year":"2018","journal-title":"Arct. Sci."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"4076","DOI":"10.1021\/es903685j","article-title":"Arctic Permafrost Active Layer Detachments Stimulate Microbial Activity and Degradation of Soil Organic Matter","volume":"44","author":"Pautler","year":"2010","journal-title":"Environ. Sci. Technol."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"14769","DOI":"10.1073\/pnas.1103910108","article-title":"Permafrost carbon-climate feedbacks accelerate global warming","volume":"108","author":"Koven","year":"2011","journal-title":"Proc. Natl. Acad. Sci. USA"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"4570","DOI":"10.1111\/gcb.13069","article-title":"Permafrost collapse alters soil carbon stocks, respiration, CH4, and N2O in upland tundra","volume":"21","author":"Abbott","year":"2015","journal-title":"Glob. Chang. Biol."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"3882","DOI":"10.1073\/pnas.1719903115","article-title":"Dependence of the evolution of carbon dynamics in the northern permafrost region on the trajectory of climate change","volume":"115","author":"McGuire","year":"2018","journal-title":"Proc. Natl. Acad. Sci. USA"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/2\/171\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T05:07:51Z","timestamp":1760159271000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/2\/171"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,1,6]]},"references-count":50,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2021,1]]}},"alternative-id":["rs13020171"],"URL":"https:\/\/doi.org\/10.3390\/rs13020171","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,1,6]]}}}