| Identifier | 2018-648-FA | ||||||||
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| Also known as | Elwha 2018 summer survey | ||||||||
| Purpose | Collect nearshore bathymetry, beach topography, and grain size information on the Elwha River delta | ||||||||
| Location | Puget Sound | ||||||||
| Summary | base, bathy, grainsize, photos, planning, svp, and topo added to FAD on 7/27/2018 | ||||||||
| Info derived | Nearshore Bathymetry, Beach Topography, Surface Grainsize | ||||||||
| Comments | Entries for this field activity are based on entries from Field Activity 2014-649-FA Entries for this field activity are based on entries from Field Activity 2015-605-FA Entries for this field activity are based on entries from Field Activity 2015-648-FA Entries for this field activity are based on entries from Field Activity 2016-608-FA Entries for this field activity are based on entries from Field Activity 2016-653-FA Entries for this field activity are based on entries from Field Activity 2017-638-FA | ||||||||
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| Vehicles | MarFac; Chevy Suburban - gray; 7 pass; G62-2874L |
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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: | Imagery, Location-Elevation, Sampling, Sonar |
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| Data type: | Photo, Navigation, Transects, Geology, Single Beam, Sound Velocity |
| Equipment | Usage description | Data types | Datasets |
|---|---|---|---|
| Trimble R7 GPS (AS) | Benchmarks, Navigation, Profiles, Transects | (no data reported) | |
| Waverunners | Navigation, Single Beam | 3 | |
| Ponar grab sampler | Biology, Chemistry, Geology | 1 | |
| camera | Photo | (no data reported) | |
| Trimble R7 GPS receiver 9 | Benchmarks, LIDAR, Navigation, Profiles, Transects | (no data reported) | |
| soundvelocityprofiler | Sound Velocity | (no data reported) | |
| Trimble R7 GPS receiver | Benchmarks, LIDAR, Navigation, Profiles, Transects | 2 |
| Dataset name | Equipment | Description | Dataset contact |
|---|---|---|---|
| Nearshore bathymetry data collected from kayak | Waverunners | This part of the data release presents bathymetry data from the Elwha River delta collected in July 2018 (USGS Field Activity Number 2018-648-FA) using a kayak. The kayak was equipped with a single-beam echosounder and a survey-grade global navigation satellite system (GNSS) receiver. | Andrew Stevens |
| Nearshore bathymetry data collected from personal watercraft | Waverunners | This portion of the USGS data release presents bathymetric data collected during surveys performed on the Elwha River delta, Washington in 2018 (USGS Field Activity Number 2018-648-FA). Bathymetric data were collected using personal watercraft (PWCs) equipped with single-beam sonar systems and global navigation satellite system (GNSS) receivers. | Andrew Stevens |
| Surface-sediment grain-size distributions | Ponar grab sampler | This portion of the data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in July 2018 (USGS Field Activity 2018-648-FA). Surface sediment was collected from 39 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 35 samples were collected by hand at low tide. | Andrew Stevens |
| Topography data | Trimble R7 GPS receiver | This part of the data release presents topography data from the Elwha River delta collected in July 2018. 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, July 2018 | 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 July 2018 (USGS Field Activity Number 2018-648-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 1,216,804 individual elevation points were collected within the survey area between July 23 and July 26, 2018. 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 511 ha) with 5-m horizontal resolution. A second DEM with 1-m resolution was produced that covered the river mouth and adjacent areas (approximately 131 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, July 2018 | 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 July 2018 (USGS Field Activity Number 2018-648-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 1,216,804 individual elevation points were collected within the survey area between July 23 and July 26, 2018. 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 511 ha) with 5-m horizontal resolution. A second DEM with 1-m resolution was produced that covered the river mouth and adjacent areas (approximately 131 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 |
