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

Details

Serval ID
serval:BIB_E2C78AB4AD64
Type
Proceedings: the proceedings of a conference.
Collection
Publications
Institution
Title
Determination of sub-daily glacier uplift and horizontal flow velocity with time-lapse images using ImGRAFT
Organization
EGU General Assembly 2017 - poster presentation
Address
Vienna
Issued date
24/04/2017
Editor
Egli Pascal Emanuel, Mankoff Ken, Mettra François, Lane Stuart Nicholas
Language
english
Abstract
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.
Keywords
Feature tracking, subglacial hydrology, remote sensing
Create date
22/08/2019 17:11
Last modification date
23/08/2019 5:10
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