Video Files

This folder contains three .gif files, one for each dye tracer test that was analyzed in this work. Each .gif file shows the entire set of photos from the dye tracer test. In all three of the .gif files,

• The flow is from right to left.
• The sediment profile identified by image processing is highlighted in green. This corresponds to the data in the "Sediment Profiles/" directory of this repository.
• The dye front location identified by image processing is highlighted in blue. This corresponds to the data in the "Dye Front Locations/" directory in this repository.

Sediment Profiles

This directory contains the coordinates of sediment profiles extracted by image processing from each timelapse photo from the dye tracer tests. In the filename, the prefix "Exp" denotes the experiment (A, B, or C) and the prefix "t_" denotes the timestep, starting from 0, that the profile represents. Each profile is a two-column numpy array. Each row of the array is a point along the sediment profile. The first column represents the x coordinate, and the second column represents the z (vertical) coordinate.

Dye Front Locations

This directory contains the coordinates of dye front locations extracted by image processing from each timelapse photo from the dye tracer tests. Notations in the filenames are the same as in the sediment profile data. The data format is also the same as the sediment profile data (two-column array, each row representing a point along the dye front, first column representing x coordinate, second column representing z (vertical) coordinate). Note: For Experiment C, it was actually the entire dye plume, and not just the dye front within the sediment, that was extracted. I.e., the dye plume was extracted as a polygon whose upper boundary coincides with the bed surface, instead of as a line marking the dye front in the sediment. For the purposes of analyses like the ones in this work, the upper boundary of the dye plume polygon can and should be discarded. This was accomplished by only considering dye front points that are more than 1 cm below the sediment profile (see Section 2.1 of the article).

Estimated Head Boundary Conditions

These directories contain the results of estimating head boundary conditions as discussed in the article. Each directory contains:

• one or more "head_BC" files, which give the values of the head boundary condition estimated at a given timestep of a given dye tracer test. The dye tracer test and timestep are identified in the filename, using the same notation as the sediment profile and the dye front location files.
• one "interp_x" file, which gives the x-coordinates corresponding to the data in the "head BC" files.

The "head_BC" files and the "interp_x" file each contain a 1D numpy array of the same length, such that the first value in the "interp_x" file corresponds to the first value in the "head_BC" file, etc. For a given experiment, the "interp_x" file corresponds to each of the head_BC files.

For Experiments B and C, five "head_BC" files are provided. These contain the results of the analyses of the five consecutive timesteps as discussed in the Results section of the article.

For Experiment A, because the bedforms are stationary and the standard deviation of repeated analyses was found to be small, only one estimated head boundary condition is provided.

Domain Boundaries

The longitudinal (i.e., along the x-axis) extent of the identified bed profiles and dye fronts varied slightly from image to image. This variation was on the order of 1 cm, and was due to a small amount of noise in the image processing extraction. In order to perform optimization on the same domain from image to image, the interior-most boundaries of the extracted profiles and fronts were used as the domain boundaries for all optimizations from a given tracer test. These values are visible as the first and last values of the interp_x datasets in the Estimated Head BCs directory. For the user's convenience, these boundary coordinates are printed here, in full precision: | Dye Tracer Test | $x_{min}$ (cm) | $x_{max}$ (cm) | |--|--| -- | | Experiment A | 347.0994152046785 | 434.7953216374275 | | Experiment B | 398.0374612382444 | 461.2374599384851 | | Experiment C | 363.7747758966792 | 415.383846045661 |