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Fractures in glaciers — Crack tips and their stress fields by observation and modeling

Humbert, Angelika ; Gross, Dietmar ; Sondershaus, Rabea ; Müller, Ralf ; Steeb, Holger ; Braun, Matthias ; Brauchle, Jörg ; Stebner, Karsten ; Rückamp, Martin (2024)
Fractures in glaciers — Crack tips and their stress fields by observation and modeling.
In: PAMM - Proceedings in Applied Mathematics and Mechanics, 2023, 23 (3)
doi: 10.26083/tuprints-00027197
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Fractures in glaciers — Crack tips and their stress fields by observation and modeling
Language: English
Date: 28 May 2024
Place of Publication: Darmstadt
Year of primary publication: November 2023
Place of primary publication: Weinheim
Publisher: Wiley-VCH
Journal or Publication Title: PAMM - Proceedings in Applied Mathematics and Mechanics
Volume of the journal: 23
Issue Number: 3
Collation: 7 Seiten
DOI: 10.26083/tuprints-00027197
Corresponding Links:
Origin: Secondary publication DeepGreen

High‐resolution optical camera systems are opening new opportunities to study fractures in ice. Here, we present data obtained from the Modular Aerial Camera System camera system operated onboard of Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) polar aircraft in northeast Greenland in 2022. In addition, we are using optical and radar satellite imagery. The study area is the 79°N Glacier (Nioghalvfjerdsbræ, 79NG), an outlet glacier of the Northeast Greenland Ice Stream. We found that crack tips are exhibiting additional isolated cracks ahead of the main crack. Subsequent crack propagation is starting from those isolated cracks, leading to an advance of the crack, with bridges between crack faces. The bridges provide information of the episodic crack propagation. Fractures have typically a length scale of kilometers and the distance of crack faces is in the order of meters to tenths of meters. Fracture modes will be inferred from stress fields computed by an inverse modeling approach using the Ice Sheet and Sea Level System Model. To this end, a surface velocity field derived from satellite remote sensing is used for the optimal control method that constrains model parameters, for example, basal friction coefficient or rheology.

Identification Number: Artikel-ID: e202300260
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-271972
Additional Information:

Special Issue: 93rd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM)

Classification DDC: 500 Science and mathematics > 550 Earth sciences and geology
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Mechanics > Continuum Mechanics
Date Deposited: 28 May 2024 12:08
Last Modified: 05 Jun 2024 09:46
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/27197
PPN: 518708136
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