Determination of sub-daily glacier uplift and horizontal flow velocity with time-lapse images using ImGRAFT

Détails

ID Serval
serval:BIB_E2C78AB4AD64
Type
Actes de conférence: ouvrage de compte-rendu (proceedings) ou édition spéciale d'un journal reconnu (conference proceedings) publié à l'occasion de conférences scientifiques.
Collection
Publications
Titre
Determination of sub-daily glacier uplift and horizontal flow velocity with time-lapse images using ImGRAFT
Organisation
EGU General Assembly 2017 - poster presentation
Adresse
Vienna
Date de publication
24/04/2017
Editeur scientifique
Egli Pascal Emanuel, Mankoff Ken, Mettra François, Lane Stuart Nicholas
Langue
anglais
Résumé
This study investigates the application of feature tracking algorithms to monitoring of glacier uplift. Several publications have confirmed the occurrence of an uplift of the glacier surface in the late morning hours of the mid to late ablation season. This uplift is thought to be caused by high sub-glacial water pressures at the onset of melt caused by overnight-deposited sediment that blocks subglacial channels. We use time-lapse images from a camera mounted in front of the glacier tongue of Haut Glacier d’Arolla during August 2016 in combination with a Digital Elevation Model and GPS measurements in order to investigate the phenomenon of glacier uplift using the feature tracking toolbox ImGRAFT. Camera position is corrected for all images and the images are geo-rectified using Ground Control Points visible in every image. Changing lighting conditions due to different sun angles create substantial noise and complicate the image analysis. A small glacier uplift of the order of 5 cm over a time span of 3 hours may be observed on certain days, confirming previous research.
Mots-clé
Feature tracking, subglacial hydrology, remote sensing
Création de la notice
22/08/2019 17:11
Dernière modification de la notice
23/08/2019 5:10
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