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
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Humbert, Angelika ; Gross, Dietmar ; Sondershaus, Rabea ; Müller, Ralf ; Steeb, Holger ; Braun, Matthias ; Brauchle, Jörg ; Stebner, Karsten ; Rückamp, Martin |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Fractures in glaciers — Crack tips and their stress fields by observation and modeling |
| Sprache: | Englisch |
| Publikationsjahr: | 28 Mai 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | November 2023 |
| Ort der Erstveröffentlichung: | Weinheim |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | PAMM - Proceedings in Applied Mathematics and Mechanics |
| Jahrgang/Volume einer Zeitschrift: | 23 |
| (Heft-)Nummer: | 3 |
| Kollation: | 7 Seiten |
| DOI: | 10.26083/tuprints-00027197 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/27197 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | 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. |
| ID-Nummer: | Artikel-ID: e202300260 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-271972 |
| Zusätzliche Informationen: | Special Issue: 93rd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| Fachbereich(e)/-gebiet(e): | 13 Fachbereich Bau- und Umweltingenieurwissenschaften 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Fachgebiete der Mechanik 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Fachgebiete der Mechanik > Fachgebiet Kontinuumsmechanik |
| Hinterlegungsdatum: | 28 Mai 2024 12:08 |
| Letzte Änderung: | 29 Mai 2024 12:02 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Fractures in glaciers — Crack tips and their stress fields by observation and modeling. (deposited 28 Mai 2024 12:08) [Gegenwärtig angezeigt]
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