DOI: 10.16904/envidat.231
title: Dataset for "Dynamic crack propagation in weak snowpack layers: Insights from high-resolution, high-speed photography"

description: This data set includes material and results described in the related research article:
Bergfeld, B., van Herwijnen, A., Reuter, B., Bobillier, G., Dual, J., and Schweizer, J.: Dynamic crack propagation in weak snowpack layers: Insights from high-resolution, high-speed photography, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2020-360, in review, 2021.
 Context: 
In order to study crack propagation in weak snowpack layers in great detail, we recorded Propagation Saw Test (PST) experiments using a high-speed camera and applied digital image correlation (DIC) to derive displacement and strain fields in the slab, weak layer, and substrate. We demonstrated the versatility and accuracy of the DIC method by showing measurements from three PST experiments, resulting in slab fracture, crack arrest and full propagation in the related publication. 
 Content:
- Supplementary material for related publication
- Ilustrative videos showing crack propagation
- High-speed recordings of the Experiments 
(the raw .cine files are available upon request)
Processed Data containing:
 - displacement, velocity and acceleration fields for the three PSTs
 - speed and touchdown dataset
description: Resource Title: Supplementary material
 Size: 299124 bytes
 Format: application/pdf
 URL: https://www.envidat.ch/dataset/be3f7643-88ab-456c-9554-aa068ac76bb7/resource/89d474b4-0965-4b96-ac8e-ff80e5aa0bd5/download/2020_bergfeld_crack_propagation_dynamics-supplement.pdf
 Description: # Supplementary material to the publication Bergfeld et al 2021
- description of the reverse crack
- additional snowpack parameters derived from the SMP measurements
description: Resource Title: Videos of crack propagation
 Size: 421948545 bytes
 Format: application/zip
 URL: https://www.envidat.ch/dataset/be3f7643-88ab-456c-9554-aa068ac76bb7/resource/08523c06-7691-4a95-ac18-9782e3fc0306/download/cracking_videos.zip
 Description: The videos show the cracking process in three example Propagation Saw Tests (flat field). The upper panel shows strain on top of the recorded movie frames. The second row shows vertical (*w*, blue line) and horizontal (*u*, orange line) displacement fields. The third and fourth row show the first and second time derivatives, namely the velocity and acceleration field.
description: Resource Title: Videos
 Size: 17687958 bytes
 Format: application/zip
 URL: https://www.envidat.ch/dataset/be3f7643-88ab-456c-9554-aa068ac76bb7/resource/a2beba55-6766-4666-b03a-24673b2d1f8e/download/reduced_raw_videos.zip
 Description: The videos are .mp4 exports of the raw files (reduced 50 times in time)
description: Resource Title: Crack speed and Touchdown distance data
 Size: 1818413 bytes
 Format: application/zip
 URL: https://www.envidat.ch/dataset/be3f7643-88ab-456c-9554-aa068ac76bb7/resource/4d88c59e-44a7-4c9f-84b8-ffd6f499f05f/download/speeds_and_touchdown_datasets.zip
 Description: Data is stored as netcdf files as python/xarray Datasets.
Datasets are self-explaining and contain the necessary information and metadata.
Information on how to load the netCDF files (datasets) can be found at "http://xarray.pydata.org/en/stable/"
description: Resource Title: DIC Data
 Size: 28991029248 bytes
 Format: No Info
 URL: https://envicloud.wsl.ch/#/?prefix=doi/envidat.231/bergfeld_et_al_2021/
 Description: Data contains the displacement, strain, velocity and acceleration fields measured during the crack propagation process in our three example Propagation Saw Tests (PSTs). Data is stored as netcdf files as python/xarray Datasets. Datasets are self-explaining and contain the necessary metadata (field notes on the PSTs, camera settings, Digital Image Corrrelation parameters, preprocessing parameters).

Information on how to load the netCDF files (datasets) can be found at "http://xarray.pydata.org/en/stable/"