Bathymetry, Acoustic Doppler Current Profiler (ADCP) survey and water quality of the Hong-Luoc river junction and Son Tay, Red River Delta, Vietnam, February 2023
https://doi.org/10.5285/47d7811a-1ee4-4934-a67e-f1c064d05a32
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This dataset contains ADCP, riverbed bathymetry, water quality and bed grainsize data for two study reaches of the Red River (Song Hong) Delta, Northern Vietnam, including Son Tay (the uppermost region of the Red River Delta) and the Hong- (Red) Luoc junction (in the mid-point of the delta) collected in February 2023. Bathymetry data are only available for the Hồng-Luộc junction.
Riverbed bathymetry data are available for the Hồng-Luộc junction at 1 m² resolution. To assess the validity of our bathymetry surveys, we overlaid this data with the ADCP transects collected at four locations during the same period at the Hồng-Luộc junction. Comparisons between ADCP transects and bathymetry data reveal broadly similar transect profiles, but a consistent 2 m offset in elevation after water level and GPS corrections. This discrepancy would have implications for the comparison of our bathymetry data with other ADCP transect data. No alterations have been made to our bathymetry survey elevations for this comparison.
ADCP data are available for the relative upstream and downstream portions of the Son Tay study reach, and across the main channel (Red River), secondary channel (Red River) and tributary channel (Luoc River) at the Hong-Luoc junction across multiple dates. Water level data are also available at Son Tay, Trieu Duong (on the Luoc river, a tributary of the Hong-Luoc junction) and Tien Duc (the downstream-most portion of the Hong-Luoc junction) during the study period. These data were provided by the Vietnam Meteorological and Hydrological Organisation.
Riverbed grainsize data are available at Son Tay - including the surface of an exposed island sand bar (its top and tail) and the relative upstream (collected in the centre of the channel cross-section) and downstream (collected in both the centre, left-bank and right-bank of the channel cross-section) - and the Hong-Luoc junction at three locations across the reach. Each bedload sample was sub-sampled into two - each sample contains five repeated measurements and an average for grainsize. Available data include D10, D50, D84, D90, kurtosis and the proportion of the sample across different grain sizes.
Water quality parameters include RDO concentration (mg/L), RDO saturation (%), oxygen partial pressure (Torr), pH (pH and mV), ORP (mV), specific conductivity (uS/cm), actual conductivity (uS/cm), salinity (PSU), resistivity (ohm/cm), water density (g/cm3), temperature (oC), barometric pressure (mm Hg), pressure (psi), depth (m), external voltage (V), barometric pressure (mbar), latitude and longitude.
Riverbed bathymetry data are available for the Hồng-Luộc junction at 1 m² resolution. To assess the validity of our bathymetry surveys, we overlaid this data with the ADCP transects collected at four locations during the same period at the Hồng-Luộc junction. Comparisons between ADCP transects and bathymetry data reveal broadly similar transect profiles, but a consistent 2 m offset in elevation after water level and GPS corrections. This discrepancy would have implications for the comparison of our bathymetry data with other ADCP transect data. No alterations have been made to our bathymetry survey elevations for this comparison.
ADCP data are available for the relative upstream and downstream portions of the Son Tay study reach, and across the main channel (Red River), secondary channel (Red River) and tributary channel (Luoc River) at the Hong-Luoc junction across multiple dates. Water level data are also available at Son Tay, Trieu Duong (on the Luoc river, a tributary of the Hong-Luoc junction) and Tien Duc (the downstream-most portion of the Hong-Luoc junction) during the study period. These data were provided by the Vietnam Meteorological and Hydrological Organisation.
Riverbed grainsize data are available at Son Tay - including the surface of an exposed island sand bar (its top and tail) and the relative upstream (collected in the centre of the channel cross-section) and downstream (collected in both the centre, left-bank and right-bank of the channel cross-section) - and the Hong-Luoc junction at three locations across the reach. Each bedload sample was sub-sampled into two - each sample contains five repeated measurements and an average for grainsize. Available data include D10, D50, D84, D90, kurtosis and the proportion of the sample across different grain sizes.
Water quality parameters include RDO concentration (mg/L), RDO saturation (%), oxygen partial pressure (Torr), pH (pH and mV), ORP (mV), specific conductivity (uS/cm), actual conductivity (uS/cm), salinity (PSU), resistivity (ohm/cm), water density (g/cm3), temperature (oC), barometric pressure (mm Hg), pressure (psi), depth (m), external voltage (V), barometric pressure (mbar), latitude and longitude.
Publication date: 2026-07-17
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Formats
Comma-separated values (CSV), ADCP, kmz
Spatial information
Study area
Spatial representation types
Tabular (text)
Vector
Raster
Vector
Raster
Spatial reference system
WGS 84 / Pseudo-Mercator
Spatial resolution
1 metres
Temporal information
Temporal extent
2023-02-01 to 2023-02-28
Provenance & quality
Bathymetry data were acquired using A PicoMB-130 boat-mounted multibeam echo sounder (MBES) deployed with an Emlid Reach RTK dGPS system for accurate horizontal and vertical positioning. Geoid corrections were applied using AUSPOS. Bathymetry data were processed at a spatial resolution of 1 m2 in Beamworx, including calibration, data cleaning (manual removal of obvious outliers) and angular corrections determined by patch testing to generate bathymetric raster maps.
For grainsize data, riverbed samples were retrieved using an Eckmann bed grab sampler in February 2023. Bar samples at Son Tay were retrieved using aluminium trays directly. Samples were stored in aluminium foil trays and refrigerated upon collection. Samples stored in aluminium trays were packaged with sealed plastic bags for transport from field sites to Newcastle University laboratories and subsequently analysed in June 2025. Samples were sub-sampled wet into clean digestion tubes - each original sample was subsampled twice for replicability assessment. Subsamples were acid digested using hydrogen peroxide overnight (cold). Samples were then heated in a waterbath to 85 degrees C and vortexed manually. After digestion was complete, samples were left to cool and settle overnight. The supernatant was poured off, samples were topped up with deionised water and span in the centrifuge at 4000 rpm for 5 minutes. Supernatant was poured off. Sodium hexametaphosphate (5%) up to 5 ml graduation was added - samples were vortexed in the centrifuge and left for 3 hours in a waterbath at 85 degrees C. No grains above 2 mm were present in samples. Before grainsize analysis on the Mastersizer - samples were vortexed - using a Pasteur pipette a vertical column of mobilised sediment was obtained. Subsample was added drop by drop to the dispersant until an optimal obscuration was achieved.
Water quality data were retrieved using an in-situ sonde attached to a weighted rope to mitigate vertical drag. The sensor has built-in depth sensor - however the rope has 1 m interval markings which allowed for the verification of depth measurements. At each 1 m interval, the sensor was left to stabilise for 30 seconds.
ADCP data were acquired using RioGrande 600 kHz boat-mounted sensors (separate sensors for each of the two study locations) for multiple channel cross-sections at Son Tay and the Hong-Luoc junction. Magnetic declination offsets have not been added. ADCP data can be read using open source software, such as QRev (https://www.usgs.gov/software/qrev-4) or WinRiver II (https://hydroacoustics.usgs.gov/movingboat/WinRiverII.shtml).
For grainsize data, riverbed samples were retrieved using an Eckmann bed grab sampler in February 2023. Bar samples at Son Tay were retrieved using aluminium trays directly. Samples were stored in aluminium foil trays and refrigerated upon collection. Samples stored in aluminium trays were packaged with sealed plastic bags for transport from field sites to Newcastle University laboratories and subsequently analysed in June 2025. Samples were sub-sampled wet into clean digestion tubes - each original sample was subsampled twice for replicability assessment. Subsamples were acid digested using hydrogen peroxide overnight (cold). Samples were then heated in a waterbath to 85 degrees C and vortexed manually. After digestion was complete, samples were left to cool and settle overnight. The supernatant was poured off, samples were topped up with deionised water and span in the centrifuge at 4000 rpm for 5 minutes. Supernatant was poured off. Sodium hexametaphosphate (5%) up to 5 ml graduation was added - samples were vortexed in the centrifuge and left for 3 hours in a waterbath at 85 degrees C. No grains above 2 mm were present in samples. Before grainsize analysis on the Mastersizer - samples were vortexed - using a Pasteur pipette a vertical column of mobilised sediment was obtained. Subsample was added drop by drop to the dispersant until an optimal obscuration was achieved.
Water quality data were retrieved using an in-situ sonde attached to a weighted rope to mitigate vertical drag. The sensor has built-in depth sensor - however the rope has 1 m interval markings which allowed for the verification of depth measurements. At each 1 m interval, the sensor was left to stabilise for 30 seconds.
ADCP data were acquired using RioGrande 600 kHz boat-mounted sensors (separate sensors for each of the two study locations) for multiple channel cross-sections at Son Tay and the Hong-Luoc junction. Magnetic declination offsets have not been added. ADCP data can be read using open source software, such as QRev (https://www.usgs.gov/software/qrev-4) or WinRiver II (https://hydroacoustics.usgs.gov/movingboat/WinRiverII.shtml).
Licensing and constraints
This dataset will be available under the terms of the Open Government Licence 
Cite this dataset as:
Runeckles, H.; Hackney, C.; Do, N.T.; Le, H.; Large, A.; Sear, E. (2026). Bathymetry, Acoustic Doppler Current Profiler (ADCP) survey and water quality of the Hong-Luoc river junction and Son Tay, Red River Delta, Vietnam, February 2023. NERC EDS Environmental Information Data Centre. https://doi.org/10.5285/47d7811a-1ee4-4934-a67e-f1c064d05a32
Correspondence/contact details
Other contacts
Publisher
NERC EDS Environmental Information Data Centre
info@eidc.ac.uk
Rights holder
Newcastle University
Custodian
NERC EDS Environmental Information Data Centre
info@eidc.ac.uk
Additional metadata
Keywords
Funding
Natural Environment Research Council Award: NE/S008926/1
British Society for Geomorphology Award: BSG-2022-31
Newcastle University NUAcT scheme
British Society for Geomorphology Award: BSG-2022-31
Newcastle University NUAcT scheme