Single-beam bathymetric survey of the French Broad River near the Interstate 26 bridge located south of Asheville, NC – December 2021, Mid-Construction #3
Dates
Publication Date
2023-12-04
Start Date
2021-12-07
End Date
2021-12-10
Citation
Whaling, A.R., 2023, Single-beam bathymetric survey of the French Broad River near the Interstate 26 bridge located south of Asheville, NC – December 2021, Mid-Construction #3: U.S. Geological Survey data release, https://doi.org/10.5066/P96C4M6E.
Summary
In January 2020, the North Carolina Department of Transportation (NCDOT) began work on the Interstate 26 (I 26) highway widening project that involves a bridge crossing over the French Broad River (FBR) near Asheville, North Carolina. The U.S Geological Survey (USGS) in cooperation with the NCDOT conducted a pre-construction bathymetric survey of the streambed in June 2019 (Whaling and Wagner, 2021) within a one-kilometer reach of the FBR at the bridge construction site. A canoe-based repeat bathymetric survey was collected with a single-beam echosounder approximately 23 months after construction began, with the purpose to monitor geomorphological changes to the streambed and inform the NCDOT of potential impacts from construction [...]
Summary
In January 2020, the North Carolina Department of Transportation (NCDOT) began work on the Interstate 26 (I 26) highway widening project that involves a bridge crossing over the French Broad River (FBR) near Asheville, North Carolina. The U.S Geological Survey (USGS) in cooperation with the NCDOT conducted a pre-construction bathymetric survey of the streambed in June 2019 (Whaling and Wagner, 2021) within a one-kilometer reach of the FBR at the bridge construction site. A canoe-based repeat bathymetric survey was collected with a single-beam echosounder approximately 23 months after construction began, with the purpose to monitor geomorphological changes to the streambed and inform the NCDOT of potential impacts from construction activities. The survey extended from 300 meters (m) upstream to 700 m downstream of the bridge. Depth data were collected using a canoe-mounted CEESCOPE single-beam echosounder manufactured by CEE Hydrosystems. Position and elevation data were collected using an SBG Ellipse-D, a dual antenna Real-Time Kinematic (RTK) Inertial Navigation System (INS). The final dataset provides position data in three dimensions with units of meters supplied in a “XYZ” file. The data are projected in Universal Transverse Mercator (UTM) coordinate system, zone 17 north, horizontally referenced to the North American Datum of 1983 (NGS, 2018a), 2011 realization (NAD83 2011), and vertically referenced to the North American Vertical Datum of 1988 (NAVD88; NGS, 2018b).
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Related External Resources
Type: Citation
National Geodetic Survey, 2018a. North American Datum of 1983, accessed March 2023, at https://www.ngs.noaa.gov/datums/horizontal/north-american-datum-1983.shtml
National Geodetic Survey, 2018b. North American Vertical Datum of 1988 (NAVD 88), accessed March 2023, at https://www.ngs.noaa.gov/datums/vertical/north-american-vertical-datum-1988.shtml
Whaling, A.R. and Wagner, D.M., 2021, Single-beam bathymetric survey of the French Broad River near the Interstate 26 bridge located South of Asheville, NC – June 2019, Pre-construction: U.S. Geological Survey data release, https://doi.org/10.5066/P9UP7SUO
Bathymetric data were collected to characterize streambed morphology in the reaches upstream and downstream from the I 26 bridge crossing over the French Broad River near Asheville, North Carolina. This data release contains bathymetric survey data from the third data collection effort since bridge construction began. This repeat survey over the same reach of the French Broad River will allow for periodic geomorphological assessments that may be used to inform the North Carolina Department of Transportation of potential impacts from construction activities.
