| Identifier | 2022-638-FA | ||||||||
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| Alternate names | Elwha 2022 summer survey | ||||||||
| Purpose | Collect nearshore bathymetry and beach topography on the Elwha River delta | ||||||||
| Location | Puget Sound | ||||||||
| Summary | Bathymetry and beach topography data collected, and data are archived on FAD. | ||||||||
| Info derived | Nearshore Bathymetry, Beach Topography | ||||||||
| Comments | Entries for this field activity are based on entries from Field Activity 2020-623-FA Entries for this field activity are based on entries from Field Activity 2021-640-FA | ||||||||
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| Vehicles | MarFac; Expedition G62-3094P |
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| Marine operations | Yes |
| Organization |
2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
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| Principal investigators | Jonathan Warrick | ||||||||||
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| Data category: | Sampling, Sonar, Location-Elevation |
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| Data type: | Geology, Sound Velocity, Single Beam, Transects, Navigation |
| Equipment | Usage description | Data types | Datasets |
|---|---|---|---|
| Hand-grab sample | Biology, Chemistry, Geology | 1 | |
| YSI Sound velocity CTD | CTD, Sound Velocity | (no data reported) | |
| Waverunners | Navigation, Single Beam | 1 | |
| Waverunners | Navigation, Single Beam | 1 | |
| Trimble R7 GPS receiver 9 | Benchmarks, LIDAR, Navigation, Profiles, Transects | (no data reported) | |
| Trimble R7 GPS receiver | Benchmarks, LIDAR, Navigation, Profiles, Transects | 2 | |
| Trimble R7 GPS (AS) | Benchmarks, Navigation, Profiles, Transects | (no data reported) | |
| Trimble R7 GPS receiver 9 | Benchmarks, LIDAR, Navigation, Profiles, Transects | (no data reported) | |
| Trimble R7 GPS receiver | Benchmarks, LIDAR, Navigation, Profiles, Transects | (no data reported) | |
| Trimble R7 GPS (AS) | Benchmarks, Navigation, Profiles, Transects | (no data reported) |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| Surface-sediment grain-size distributions of the Elwha River delta, Washington, August 2022 | Hand-grab sample | This portion of the data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in August 2022 (USGS Field Activity 2022-638-FA). Surface sediment was collected from 67 locations using a small ponar, or 'grab', sampler from the R/V Frontier in water depths between about 1 and 17 m around the delta. An additional 44 samples were collected by hand at low tide. A hand-held global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. The grain size distributions of suitable samples were determined using standard techniques developed by the USGS Pacific Coastal and Marine Science Center sediment lab. Grab samples that yielded less than 50 g of sediment were omitted from analysis. The grain-size data are provided in a comma-delimited spreadsheet (.csv). | Andrew Stevens |
| Nearshore bathymetry data from the Elwha River delta, Washington, August 2022 | Waverunners | This portion of the USGS data release presents bathymetric data collected during surveys performed on the Elwha River delta, Washington in 2022 (USGS Field Activity Number 2022-638-FA). Bathymetric data were collected using personal watercraft (PWCs) and a kayak equipped with single-beam sonar systems and global navigation satellite system (GNSS) receivers. | Andrew Stevens |
| Topography data from the Elwha River delta, Washington, August 2022 | Trimble R7 GPS receiver | This part of the data release presents topography data from the Elwha River delta collected in August 2022. Topography data were collected on foot with global navigation satellite system (GNSS) receivers mounted on backpacks. | Andrew Stevens |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| Digital elevation models (DEMs) of the Elwha River delta, Washington, August 2022 | Waverunners | This portion of the USGS data release presents digital elevation models (DEMs) derived from bathymetric and topographic surveys conducted on the Elwha River delta in August 2022 (USGS Field Activity Number 2022-638-FA). Nearshore bathymetry data were collected using two personal watercraft (PWCs) and a kayak equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS) receivers. Topographic data were collected on foot with survey-grade GNSS receivers mounted on backpacks. Positions of the survey platforms were referenced to a GNSS base station placed on a benchmark with known horizontal and vertical coordinates relative to the North American Datum of 1983 (CORS96 realization) and North American Vertical Datum of 1988 based on NGS Geoid09 vertical offsets. The final data were projected in Cartesian coordinates using the Washington State Plane North (meters) coordinate system. A total of 1,285,634 individual elevation points were collected within the survey area between August 8 and August 11, 2022. DEM surfaces were produced from all available elevation data using linear interpolation. Two separate DEMs were constructed. A DEM was produced that covered the entire survey area (approximately 482 ha) with 5-m horizontal resolution. A second DEM with 1-m resolution was produced that covered the river mouth and adjacent areas (approximately 209 ha). The DEMs were created by interpolating between measurements as much as 50 meters apart. For this reason, we cannot evaluate the accuracy of each point in the DEM, only the measurements it is based on. The estimated vertical uncertainties of the bathymetric and topographic measurements are 12 and 5 cm, respectively. Digital data files for each DEM are provided in ESRI ARC ASCII (*.asc) format. | Andrew Stevens |
| Digital elevation models (DEMs) of the Elwha River delta, Washington, August 2022 | Trimble R7 GPS receiver | This portion of the USGS data release presents digital elevation models (DEMs) derived from bathymetric and topographic surveys conducted on the Elwha River delta in August 2022 (USGS Field Activity Number 2022-638-FA). Nearshore bathymetry data were collected using two personal watercraft (PWCs) and a kayak equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS) receivers. Topographic data were collected on foot with survey-grade GNSS receivers mounted on backpacks. Positions of the survey platforms were referenced to a GNSS base station placed on a benchmark with known horizontal and vertical coordinates relative to the North American Datum of 1983 (CORS96 realization) and North American Vertical Datum of 1988 based on NGS Geoid09 vertical offsets. The final data were projected in Cartesian coordinates using the Washington State Plane North (meters) coordinate system. A total of 1,285,634 individual elevation points were collected within the survey area between August 8 and August 11, 2022. DEM surfaces were produced from all available elevation data using linear interpolation. Two separate DEMs were constructed. A DEM was produced that covered the entire survey area (approximately 482 ha) with 5-m horizontal resolution. A second DEM with 1-m resolution was produced that covered the river mouth and adjacent areas (approximately 209 ha). The DEMs were created by interpolating between measurements as much as 50 meters apart. For this reason, we cannot evaluate the accuracy of each point in the DEM, only the measurements it is based on. The estimated vertical uncertainties of the bathymetric and topographic measurements are 12 and 5 cm, respectively. Digital data files for each DEM are provided in ESRI ARC ASCII (*.asc) format. | Andrew Stevens |
