Matches in SemOpenAlex for { <https://semopenalex.org/work/W3161076948> ?p ?o ?g. }
Showing items 1 to 82 of
82
with 100 items per page.
- W3161076948 abstract "<p>Supraglacial debris extent and thickness is an important control on the ablation rate of a debris-covered glacier. Debris is supplied to the surface of a debris-covered glacier through several pathways with the primary source of this debris originating from rockfall in both the accumulation area, where debris is transported englacially downglacier, and the upper ablation area, where debris remains in the supraglacial environment while transported downglacier. Current quantification of debris supply to debris-covered glaciers is limited to headwall erosion rates determined through the dating of headwall derived supraglacial debris using <sup>10</sup>Be concentrations, or estimations of these rates using a ratio of supraglacial debris flux to the headwall catchment area. To increase the knowledge of the contemporary short-term estimations of these processes, repeat LiDAR scans of debris-contributing slopes were acquired during a single ablation season in both July and September at Miage Glacier, Italy. An area of ~7.7 km<sup>2</sup> comprising > 1.8 billion 3D points was scanned per survey epoch, covering ~33% of the glacierised area of Miage Glacier. Sequential scans were co-registered using an iterative closest point adjustment algorithm within CloudCompare. Manual filtering was used to remove snow, artefacts, and the glacier surface from the raw point clouds. To ease processing, the rock walls were segmented both horizontally and vertically within the catchment. Change detection was carried out using the M3C2 algorithm at a projection scale of 0.3 m and point clouds representing areas of significant change within the segment were obtained using a distributed 95<sup>th</sup> percentile confidence interval. The DBSCAN clustering algorithm was used to identify individual rockfall clusters, and the volume of each rockfall was calculated using both an iterative alpha-shapes approach. Finally, a bounding box approach was used to estimate the a, b and c axes and therefore shape of the individual rockfalls. Increasing the projection scale used within the M3C2 algorithm decreases the frequency of significant rockfalls found exponentially, and an iterative alpha shapes approach is the most computationally efficient volume estimation method. Our results show that the Miage Glacier catchment is dominated by small scale rockfall events, although at least one large-scale rockfall event is evident in the upper ablation area (validated by time-lapse imagery). This failure on a recently deglaciated area of rock wall highlights that slope response to glacial erosion can be rapid following periods of deglaciation.</p>" @default.
- W3161076948 created "2021-05-24" @default.
- W3161076948 creator A5040884723 @default.
- W3161076948 creator A5051429392 @default.
- W3161076948 creator A5052683994 @default.
- W3161076948 creator A5060584322 @default.
- W3161076948 creator A5069954186 @default.
- W3161076948 date "2021-03-03" @default.
- W3161076948 modified "2023-09-26" @default.
- W3161076948 title "Quantifying and characterising contemporary rockfall supply to a debris-covered glacier catchment" @default.
- W3161076948 doi "https://doi.org/10.5194/egusphere-egu21-4999" @default.
- W3161076948 hasPublicationYear "2021" @default.
- W3161076948 type Work @default.
- W3161076948 sameAs 3161076948 @default.
- W3161076948 citedByCount "0" @default.
- W3161076948 crossrefType "posted-content" @default.
- W3161076948 hasAuthorship W3161076948A5040884723 @default.
- W3161076948 hasAuthorship W3161076948A5051429392 @default.
- W3161076948 hasAuthorship W3161076948A5052683994 @default.
- W3161076948 hasAuthorship W3161076948A5060584322 @default.
- W3161076948 hasAuthorship W3161076948A5069954186 @default.
- W3161076948 hasConcept C100834320 @default.
- W3161076948 hasConcept C100970517 @default.
- W3161076948 hasConcept C111368507 @default.
- W3161076948 hasConcept C114793014 @default.
- W3161076948 hasConcept C126645576 @default.
- W3161076948 hasConcept C127313418 @default.
- W3161076948 hasConcept C136894858 @default.
- W3161076948 hasConcept C169556411 @default.
- W3161076948 hasConcept C186295008 @default.
- W3161076948 hasConcept C187320778 @default.
- W3161076948 hasConcept C193091731 @default.
- W3161076948 hasConcept C197046000 @default.
- W3161076948 hasConcept C197435368 @default.
- W3161076948 hasConcept C204665574 @default.
- W3161076948 hasConcept C205649164 @default.
- W3161076948 hasConcept C2776023875 @default.
- W3161076948 hasConcept C49204034 @default.
- W3161076948 hasConcept C58640448 @default.
- W3161076948 hasConcept C76856502 @default.
- W3161076948 hasConcept C76886044 @default.
- W3161076948 hasConcept C81820708 @default.
- W3161076948 hasConcept C84548589 @default.
- W3161076948 hasConceptScore W3161076948C100834320 @default.
- W3161076948 hasConceptScore W3161076948C100970517 @default.
- W3161076948 hasConceptScore W3161076948C111368507 @default.
- W3161076948 hasConceptScore W3161076948C114793014 @default.
- W3161076948 hasConceptScore W3161076948C126645576 @default.
- W3161076948 hasConceptScore W3161076948C127313418 @default.
- W3161076948 hasConceptScore W3161076948C136894858 @default.
- W3161076948 hasConceptScore W3161076948C169556411 @default.
- W3161076948 hasConceptScore W3161076948C186295008 @default.
- W3161076948 hasConceptScore W3161076948C187320778 @default.
- W3161076948 hasConceptScore W3161076948C193091731 @default.
- W3161076948 hasConceptScore W3161076948C197046000 @default.
- W3161076948 hasConceptScore W3161076948C197435368 @default.
- W3161076948 hasConceptScore W3161076948C204665574 @default.
- W3161076948 hasConceptScore W3161076948C205649164 @default.
- W3161076948 hasConceptScore W3161076948C2776023875 @default.
- W3161076948 hasConceptScore W3161076948C49204034 @default.
- W3161076948 hasConceptScore W3161076948C58640448 @default.
- W3161076948 hasConceptScore W3161076948C76856502 @default.
- W3161076948 hasConceptScore W3161076948C76886044 @default.
- W3161076948 hasConceptScore W3161076948C81820708 @default.
- W3161076948 hasConceptScore W3161076948C84548589 @default.
- W3161076948 hasLocation W31610769481 @default.
- W3161076948 hasOpenAccess W3161076948 @default.
- W3161076948 hasPrimaryLocation W31610769481 @default.
- W3161076948 hasRelatedWork W1037181 @default.
- W3161076948 hasRelatedWork W12947238 @default.
- W3161076948 hasRelatedWork W16408473 @default.
- W3161076948 hasRelatedWork W22116304 @default.
- W3161076948 hasRelatedWork W25662947 @default.
- W3161076948 hasRelatedWork W30604921 @default.
- W3161076948 hasRelatedWork W4756713 @default.
- W3161076948 hasRelatedWork W6630368 @default.
- W3161076948 hasRelatedWork W9130192 @default.
- W3161076948 hasRelatedWork W16402842 @default.
- W3161076948 isParatext "false" @default.
- W3161076948 isRetracted "false" @default.
- W3161076948 magId "3161076948" @default.
- W3161076948 workType "article" @default.