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datasets.html
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<h1><strong><a href="index.html">Madeline Kelley</a></strong></h1>
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<h2>Datasets</h2>
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</p>
<h3>PTV Analysis (Saltation Cloud)</h3>
<p>
PTV analysis was conducted on eight different experimental runs from high-speed imagery. The tunnel
freestream wind velocity was controlled to range from approximately ~7.0 to 9.0 ms-1. This range was
selected to incorporate experimental data from just above static (impact) fluid threshold conditions
to higher transport rates. The active bed section was modified to either be flat or have natural
ripple development. Prior to image acquisition, the bed was flattened for runs 1-4. For runs 5-8,
the tunnel was allowed to run until the ripple form and migration speed had stabilized,
approximately 10 minutes. All runs resulted in 10,692 images over approximately 4.5 seconds.
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All measurements were taken towards the end of the active bed section, which is enclosed with
plexiglass doors to allow for imaging and access to instrumentation. Downwind 9.5 m from the inlet,
a side-mounted camera (Phantom Miro 341) captured sand particle motions in the horizontal and
vertical directions. Image dimensions were 1024x768 pixels with a spatial resolution of 168:1 pixel
to cm and were collected at 2353 fps. The sampling period was selected to balance data storage
limits and resolution needs. The number of images recorded in a single run was 10,692 over a
4.5-second duration, which was the maximum the instrument's onboard memory would allow for the given
resolution.
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The HS camera captured particles illuminated by a laser sheet from a 7-watt laser diode (nubm44-v2
450 nm) and a 5-degree Powell Lens (Laserline Optics). The sheet covered the entire length and
height of the imaging window. Using a ruler, we measured the laser sheet width to be approximately
0.2 cm but estimated its effective illumination width to be 0.3 cm due to increased scattering at
the bed. An Arduino board was used to synchronize the timing of the laser sheet and camera capture.
</p>
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<a href="https://www.dropbox.com/scl/fo/wkkt2aej8f4xxe7d8k2dh/AKlD4u7KJZ83y3BKo4UBX90?rlkey=rd2mis71x60ldmqfq2lyi6o9a&e=1&dl=0">Here is a link to download the original image sequences from the 8 runs.</a>
</p>
<p><span class="image under"><img src="images/windtunnel.png" alt="" /></span>
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<p><span class="image under"><img src="images/sand-noseed.jpg" alt="" /></span>
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Here are some
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target="_blank">13.5 Hz Run 1 Raw images
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from Maddy's Dropbox. Next, we can
<a href="https://www.dropbox.com/scl/fi/17i7whnffdnls5pqq53oj/FlatTracks_v2.mat?rlkey=ie5cw5shrb7y56lb5zdvpyb5a&dl=1"
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Or we want to do the same with
<a href="data/Figure_FlatViolin.fig"
download>figures from our saved location (GitHub).
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Most importantly, we can download a whole
<a href="data/Runs1-4_flat.zip"
download>zipfile (Runs 1-4 Flat)
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of one project's data.
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