This readme file was generated on 2025-03-07 GENERAL INFORMATION Title of Dataset: Video recordings and data for measuring pore water velocities and dynamic contact angles at unstable wetting fronts Author/Principal Investigator Information Name: Naaran Brindt ORCID: 0000-0002-2668-9585 Dept. of Biological & Environmental Engineering, Cornell University Address: B62 Riely-Robb Hall, 111 Wing Drive, Cornell University, Ithaca, NY 14853 Email: nab229@cornell.edu Author/Associate or Co-investigator Information Name: Tammo Steenhuis ORCID: 0000-0003-0508-9350 Institution: Dept. of Biological & Environmental Engineering, Cornell University Address: 206 Riley-Robb Hall, 111 Wing Drive, Cornell University, Ithaca, NY 14853 Email: tss1@cornell.edu Date of data collection: Geographic location of data collection: Information about funding sources that supported the collection of the data: SHARING/ACCESS INFORMATION Licenses/restrictions placed on the data: This dataset is shared under a Creative Commons 1.0 Universal Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/). The material can be copied, modified and used without permission, but attribution to the original authors is always appreciated. Links to publications that cite or use the data: Brindt, N., Min, X., Yan, J., Jung, S., Parlange, J.-Y., & Steenhuis, T. S. (2024). Measuring pore water velocities and dynamic contact angles at unstable wetting fronts. Advances in Water Resources, 186, 104661. https://doi.org/10.1016/j.advwatres.2024.104661 Links to other publicly accessible locations of the data: Links/relationships to ancillary data sets: Was data derived from another source? If yes, list source(s): Recommended citation for this dataset: Naaran Brindt, Xinying Min, Jiuzhou Yan, Sunghwan Jung, J-Yves Parlange, Tammo S. Steenhuis.(2024) Video recordings and data for measuring pore water velocities and dynamic contact angles at unstable wetting fronts. [dataset]. Cornell University Library eCommons Repository. https://hdl.handle.net/1813/114207 DATA & FILE OVERVIEW File List: 1. Run_III_PhotronNova_1024x1024px.AVI: 43.642 seconds at 500 fps with a 0.009 mm/pixel resolution. 2. Run_IV_PhotronNova_1024x1024px.AVI: 43.642 seconds at 500 fps with a 0.0201 mm/pixel resolution. 3. Experimental setup.pdf: includes an abstract, experimental setup, and figure 1 which are 3 images of the experimental setup for the wide cell experiment with (a) a wide view of the setup including the camera, the cell, the backlight, and the pump at the back, (b) a close-up of the cell mid-experiment, and (c): the angle of the camera orientation. Due to the subject matter, the images in the .pdf files in this dataset do not include alternate text for web accessibility. File Tree . ├── Brindt_etal_2025_README.txt ├── Experimental setup.pdf ├── Run_III_PhotronNova_1024x1024px.AVI └── Run_IV_PhotronNova_1024x1024px.AVI 1 directory, 4 files Relationship between files, if important: Additional related data collected that was not included in the current data package: Are there multiple versions of the dataset? If yes, name of file(s) that was updated: Why was the file updated? When was the file updated? METHODOLOGICAL INFORMATION Description of methods used for collection/generation of data: A 4 mm thick layer of unwashed 20/30 sand (Unmin Corporation, Ottawa, MN), with grain size 0.6-0.8 mm, was packed in a transparent flow cell without a front plate that was 50 mm long and 18 mm wide. The cell was placed at a 30-degree angle, the maximum possible incline, without the sand spilling out. Water with 1 mg of brilliant blue/liter with a syringe pump (KD Scientific Inc., Model 101) at a rate of 15 μl/min was added to the flow cell to form the finger. The high-speed camera, a grayscale-sensitive Photron Nova S6-800, was placed above the cell, pointing down at a 60-degree angle. During the experiment, the camera captured 21821 images at 500 fps, resulting in a video length of 43.642 seconds. The camera resolution was 1024 by 1024 pixels. The cell and camera setup are presented in Figure 1. Background lighting consisted of a 40W LED lighting array (SP-E-365D LED Light, Genaray USA). The resolution in Run III was 0.009 mm/pixel, and in Run IV, 0.0201 mm/pixel. Methods for processing the data: A 4 mm thick layer of unwashed 20/30 sand (Unmin Corporation, Ottawa, MN), with grain size 0.6-0.8 mm, was packed in a transparent flow cell without a front plate that was 50 mm long and 18 mm wide. The cell was placed at a 30-degree angle, the maximum possible incline, without the sand spilling out. Water with 1 mg of brilliant blue/liter with a syringe pump (KD Scientific Inc., Model 101) at a rate of 15 μl/min was added to the flow cell to form the finger. The high-speed camera, a grayscale-sensitive Photron Nova S6-800, was placed above the cell, pointing down at a 60- degree angle. During the experiment, the camera captured 21821 images at 500 fps, resulting in a video length of 43.642 seconds. The camera resolution was 1024 by 1024 pixels. The cell and camera setup are presented in Figure 1. Background lighting consisted of a 40W LED lighting array (SP-E-365D LED Light, Genaray USA). The resolution in Run III was 0.009 mm/pixel, and in Run IV, 0.0201 mm/pixel. Instrument- or software-specific information needed to interpret the data: Standards and calibration information, if appropriate: Environmental/experimental conditions: Describe any quality-assurance procedures performed on the data: People involved with sample collection, processing, analysis and/or submission: DATA-SPECIFIC INFORMATION FOR: Number of variables: Number of cases/rows: Variable List: Missing data codes: Specialized formats or other abbreviations used: