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| Range of values | |
|---|---|
| Minimum: | 0.01940 |
| Maximum: | 808.00128 |
| Units: | seconds |
| Range of values | |
|---|---|
| Minimum: | -0.50460 |
| Maximum: | 0.47179 |
| Units: | Meters per second (m/s) |
This dataset presents observations of along-tank flow velocity during observations of sand and oil agglomerate exhumation and burial processes. Along-tank flow velocities were collected by a single Vectrino acoustic Doppler profiler during a 2014 USGS small-oscillatory flow tunnel experiment conducted at the Naval Research Laboratory (NRL), Stennis Space Center, Mississippi. The information contained within the text files is needed to capture flow velocity as aSOAs interact with a movable coarse grain sand bed under laboratory conditions. This dataset contains tabular digital data, in text files, of flow velocities in a small-oscillatory flow tunnel from the sea floor interaction experiment. Videos of tank observations, which provide additional information about aSOA incipient motion, were also collected during each experiment (see 2017_309_DD_SFI_video.zip) and are included in this data release.
First, velocities were passed through a MATLAB built-in one dimensional smoothing filter (filter.m) with a window size of ten. Second, the difference was taken between the raw and smoothed time series and the standard deviation of that difference was calculated. Third, points with a difference greater than three times the standard deviation were identified, and replaced with the smoothed signal value at the same time. The first, second, and third, steps were then repeated three times, with the previously de-spiked signal replacing the input each time, which produced final, quality controlled, de-spiked and smoothed de-spiked time series of velocities.De-spiked and smoothed de-spiked records of 3D velocity data, time, and depth information were re-saved in MATLAB readable ‘.mat’ files. De-spiked and smoothed de-spiked velocity data were treated with an additional quality control step.
A measure of signal quality, called Correlation, was recorded by the Vectrino profiler along with the raw data. Correlation is the measure of the data correlation as returned by each of the three acoustic beams of the profiler. Time points with correlation less than 70% are replaced in the record with non-number (NaN) values.Quality controlled records of de-spiked and smoothed de-spiked velocity were saved in MATLAB readable ‘.mat’ files. Person who carried out this activity:
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Are there legal restrictions on access or use of the data?Access_Constraints: None
Use_Constraints:Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
| Data format: | The WinZip (version 14.0) file provides flow velocity collected during small-oscillatory flow tunnel laboratory experiments at the Naval Research Laboratory, Stennis Space Center, Stennis Mississippi and the associated metadata. in format TXT (version 1) text file Size: 3.8 |
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| Network links: |
https://coastal.er.usgs.gov/data-release/doi-F76D5R69/data/2017_309_DD_SFI_velocity.zip |
This zip file contains data available in text file format (txt). The user must have software capable of reading text file format (txt) to use these data.