Acoustic Doppler Current Profiler (ADCP) field measurements of flow velocity from the Tanana and Nenana Rivers, Alaska, collected on August 18, 2021
Dates
Acquisition
2021-08-18
Publication Date
2022-10-20
Citation
Legleiter, C.J., Kinzel, P.J., Laker, M., and Conaway, J., 2022, Digital orthophotos and field measurements of flow velocity from the Tanana and Nenana Rivers, Alaska, from August 2021 (ver. 2.0, June 2024): U.S. Geological Survey data release, https://doi.org/10.5066/P968OENT.
Summary
Field measurements of depth-averaged flow velocity were acquired from the Tanana and Nenana Rivers near Nenana, Alaska, August 18, 2021, to support research on estimating surface flow velocities from remotely sensed data via particle image velocimetry (PIV). The velocity measurements included in this data release were obtained using a TRDI RiverRay acoustic Doppler current profiler (ADCP) deployed from a boat with an outboard motor. These data were collected along 7 cross-sections on the Tanana River and 7 cross-sections on the Nenana River; two passes across the channel were made at each cross-section. This data release provides depth-averaged flow velocities derived from the raw ADCP data using the TRDI WinRiver II processing software. [...]
Summary
Field measurements of depth-averaged flow velocity were acquired from the Tanana and Nenana Rivers near Nenana, Alaska, August 18, 2021, to support research on estimating surface flow velocities from remotely sensed data via particle image velocimetry (PIV). The velocity measurements included in this data release were obtained using a TRDI RiverRay acoustic Doppler current profiler (ADCP) deployed from a boat with an outboard motor. These data were collected along 7 cross-sections on the Tanana River and 7 cross-sections on the Nenana River; two passes across the channel were made at each cross-section. This data release provides depth-averaged flow velocities derived from the raw ADCP data using the TRDI WinRiver II processing software. The WinRiver II output was imported into the USGS Velocity Mapping Toolbox (VMT), which was used to project measurements made along each pass back and forth across the channel onto a common mean cross-section and smooth the data. VMT and custom MATLAB functions were then used to generate text files with projected spatial coordinates, depth-averaged velocity magnitudes, and east and north components of the velocity vectors. The spatial location of each measurement was obtained using a differential GPS included as part of the RiverRay instrument package. The map projection and datum for these data are UTM Zone 6 N and NAD 83, respectively. This data release consists of two comma-delimited (*.csv) text files, one for the Tanana River and one for the Nenana River. Each file consists of five columns: UTM_East_m, UTM_North_m, Velocity_Magnitude_m_per_s, Velocity_East_Component_m_per_s, and Velocity_North_Component_m_per_s. The first two columns are the easting and northing spatial coordinates, respectively, the third column is the depth-averaged velocity magnitude in meters per second, the fourth column is the east component of the the depth-averaged velocity magnitude in meters per second, and the fifth column is the north component of the the depth-averaged velocity magnitude in meters per second. This field-based data set was used to assess the accuracy of remotely sensed estimates of surface flow velocity derived from fixed wing aircraft-based optical image sequences via PIV.
Click on title to download individual files attached to this item.
Tanana+NenanaADCPmetadata.xml “Metadata describing the data and how it was obtained and processed.” Original FGDC Metadata
View
22.95 KB
application/fgdc+xml
TananaADCP.jpg “Acoustic Doppler Current Profiler (ADCP) used to measure flow velocities.”
42.3 KB
image/jpeg
NenanaAdcp.csv “Text file with ADCP measurements of flow velocity from the Nenana River.”
39.87 KB
text/csv
TananaAdcp.csv “Text file with ADCP measurements of flow velocity from the Tanana River.”
125.47 KB
text/csv
Material Request Instructions
For questions concerning this data set, please contact:
Dr. Carl J. Legleiter - cjl@usgs.gov
Observing Systems Division
United States Geological Survey
15263 W. 49th Pl.
Golden, CO 80403
Purpose
The purpose of this study was to assess the feasibility of estimating surface flow velocities from optical image sequences acquired from a fixed-wing aircraft flying along the river by tracking water surface features via particle image velocimetry (PIV). Remote sensing of flow velocities could provide a more efficient, cost-effective alternative to conventional field-based methods of measuring channel hydraulics and thus become an important component of non-contact approaches to streamgaging. Moreover, the ability to collect such data from a moving aircraft opens up the possibility of examining longer river reaches via remote sensing. This field-based data set was used to assess the accuracy of remotely sensed estimates of surface flow velocity derived from fixed wing aircraft-based optical image sequences via PIV.
Rights
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Preview Image
Acoustic Doppler Current Profiler (ADCP) used to measure flow velocities.