https://github.com/daniel-furman/ice-densification-research
All data and analyses to reproduce my ice material science research, as published in Penn Science: Furman and Goldsby, 2021.
https://github.com/daniel-furman/ice-densification-research
compaction dislocation-creep firn grain-size ice-sheets material-science mechanism-maps rheology scientific-computing sympy-library
Last synced: about 2 months ago
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All data and analyses to reproduce my ice material science research, as published in Penn Science: Furman and Goldsby, 2021.
- Host: GitHub
- URL: https://github.com/daniel-furman/ice-densification-research
- Owner: daniel-furman
- License: mit
- Created: 2020-09-09T21:06:32.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2021-05-05T21:39:56.000Z (about 4 years ago)
- Last Synced: 2025-01-29T19:24:30.377Z (4 months ago)
- Topics: compaction, dislocation-creep, firn, grain-size, ice-sheets, material-science, mechanism-maps, rheology, scientific-computing, sympy-library
- Language: Jupyter Notebook
- Homepage: https://nbviewer.jupyter.org/github/daniel-furman/ice-densification-research/blob/master/Firn_notebook.ipynb
- Size: 7.07 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
## The Rheological Behavior of Firn: Experimental Observations of Dislocation Creep via Grain Boundary Sliding
*How does grain size, strain state, and microstructure influence the rheological behavior of ice compaction among glaciers and ice sheets?*
**[`Firn_notebook.ipynb`](https://nbviewer.jupyter.org/github/daniel-furman/Furman-and-Goldsby/blob/master/Firn_notebook.ipynb)**
---
Experimental results | Mechanism map for firn
:-------------------------------------------:|:------------------------------:
 | 
### Key Points
---
* Constant stress laboratory experiments were performed on H20 ice powder samples with roughly uniform grain size varying from 5 to 550 micrometers (µm) in radius.
* Two rheologically-distinct creep regimes emerged, characterized by their grain size sensitivity and stress dependence: dislocation creep (n ~ 3.7, p ~ 0) and disGBS (n ~ 1.6, p ~ 0.9).
* Flow laws resolved the disGBS mechanism as predominantly rate-limiting for natural conditions, such as in glaciers and ice sheets.
### Data
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Output from compaction tests (compaction*.csv) and pressure-density profiles (site-name*.csv) are contained in the data/ subfolder.
### Paper Figures
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Figure 1: From (a) [Breant et al. (2017)](https://doi.org/10.5194/cp-13-833-2017) (their Figure 3) and (b) [Faria et al. (2014)](https://doi.org/10.1016/j.jsg.2013.11.003) (their Figure 7).
Figure 2: Photographs taken in the laboratory and diagram made with PowerPoint
Figure 3: `flow_law_fiting.py`
Figure 4: `mechanism_maps.py`
Table S1: `calc_dens_rates.py`
### Workflow
---
The programming workflow is available in [`Firn_notebook.ipynb`](https://nbviewer.jupyter.org/github/daniel-furman/Furman-and-Goldsby/blob/master/Firn_notebook.ipynb), where each .py script is ran in an easy to follow sequence.