Discharge measurements at Thompsons Beach, New Jersey, collected October 2018 and September 2022

Discharge data were collected using a Teledyne RDI Workhorse Rio Grande 1200 kHz acoustic Doppler current profiler (ADCP) in a tidal channel at Thompsons Beach, NJ.
Data were collected on October 9 and 10, 2018 and September 27, 2022. Stakes were driven into the East and West banks of the channel to mark the transect edges. In 2018, the ADCP was mounted in a trimaran boat that was pulled across the creek by hand using a line that was strung across the creek. In 2022, the ADCP was mounted on a remote-controlled boat and the boat was driven repeatedly across the channel between the stakes, collecting data during each transect crossing over 7 hours of a semidiurnal tidal cycle.
In 2018, the stakes were located at 39.19564 N, 74.98369 W on the East bank, and 39.19538 N, 74.98442 W on the West bank. In 2022, the stakes were located at 39.19549 N, 74.98366 W on the East bank, and 39.19536 N, 74.98434 W on the West bank. The coordinates are in the North American Datum of 1983 (National Spatial Reference System 2011).
Measurements were made during maximum flood and ebb tidal currents, which occur on either side of high tide, to capture maximum positive and negative discharge. ADCP data were recorded and initially reviewed using WinRiver II version 2.18. WinRiver II is available at https://hydroacoustics.usgs.gov/movingboat/WinRiverII.shtml. The raw data were recorded in .mmt and .pd0 files, which are the native file formats of WinRiver II.

Data were post-processed using QRev 4.34, a program developed by the USGS Office of Surface Water to compute moving-boat ADCP discharge. QRev automates data-quality checks, data filtering, extrapolation methods, and invalid-data-handling steps, and provides estimates of uncertainty to help guide the user. QRev is available at https://hydroacoustics.usgs.gov/movingboat/QRev.shtml. Processing in QRev adhered to the defaults with additional steps as outlined below.
An independent temperature reading collected with a YSI EXO2 multiparameter sonde was entered to provide a check for the ADCP measured temperature in accordance with USGS policies.
Salinity was applied based on field measurements of water-column salinity using a YSI EXO2 multiparameter sonde. Using a field-measured salinity improves the estimate of speed of sound in water, which is used in computing discharge.
The magnetic variation was calculated using NOAA's Magnetic Field Calculator (https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml) and entered for each file.
For data collected October 9, 2018, a bad transect (#000), which included data from two channel crossings, was removed (unchecked) from the final dataset.
For data collected October 10, 2018, bad transects (#014, #021, #023, #036) were removed (unchecked) from the final dataset. These were removed because they contained data either for more than a full transect or had other operational errors. For Transects #015-035, the left and right banks were entered incorrectly in the field, so the left and right banks were switched during data processing.
For data collected September 27, 2022, bad transects (#002, #010, #048) were removed (unchecked) from the final dataset because they contained data for more than a full transect or had other operational errors. The starting edge distance was changed to 0.0 for transect #017 as it was entered incorrectly in the field. Additionally, the left bank was changed to the right bank and the right bank was switched to the left bank in order to match the designated left and right banks in 2018 so the direction of the discharge would be the same in 2018 and 2022 (ebb-positive convention).
The data were exported from QRev as a .mat file using bottom-track (BT) navigation reference.