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Filters: Tags: Global Positioning System (GPS) observations (X) > Date Range: {"choice":"year"} (X) > partyWithName: U.S. Geological Survey - Science Base (X)

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This portion of the USGS data release presents topography data collected during surveys performed in the Columbia River littoral cell, Washington and Oregon, in 2022 (USGS Field Activity Number 2022-641-FA). Topographic profiles were collected by walking along survey lines with global navigation satellite system (GNSS) receivers mounted on backpacks. Prior to data collection, vertical distances between the GNSS antennas and the ground were measured using a tape measure. Hand-held data collectors were used to log raw data and display navigational information allowing surveyors to navigate survey lines spaced at 100- to 1000-m intervals along the beach. Profiles were surveyed from the landward edge of the study area...
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This portion of the USGS data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in September 2013 (USGS Field Activity Number W-07-13-PS). Surface sediment was sampled using a small ponar, or 'grab', sampler on September 19, 2013 from the R/V Frontier at a total of 62 locations in water depths between about 1 and 12 m around the delta. An additional 21 sediment samples were collected between September 16 and September 19, 2013 at low tide from intertidal locations on the delta. A handheld GNSS receiver was used to determine the locations of sediment samples. The grain-size distributions of samples were determined in the USGS Pacific Coastal and Marine Science...
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This portion of the USGS data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in January 2015 (USGS Field Activity Number 2015-605-FA). Surface sediment was collected on January 28, 2015, at a total of 61 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. A hand-held global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. The grain-size distributions of samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Approximately 20 g of sediment was sub-sampled and 10 mL of 35 percent hydrogen peroxide...
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This portion of the USGS data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in September 2014 (USGS Field Activity Number 2014-649-FA). Surface sediment was collected on September 5, 2014, at a total of 63 locations using a small ponar, or 'grab', sampler from the R/V Frontier in water depths between approximately 1 and 17 m around the delta. A hand-held global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. The grain-size distributions of samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Approximately 20 g of sediment was sub-sampled and 10 mL of 35 percent hydrogen...
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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...
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This portion of the USGS data release presents bathymetry data collected during surveys performed in the Columbia River littoral cell and mouth of the Columbia River, Washington and Oregon, in 2022 (USGS Field Activity Number 2022-641-FA). Bathymetry data were collected using four personal watercraft (PWCs) equipped with single-beam sonar systems and global navigation satellite system (GNSS) receivers. The sonar systems consisted of either an Odom Echotrac CV-100 or CEE Hydrosystems Ceescope single-beam echosounder and 200 kHz transducer with a 9-degree beam angle. Raw acoustic backscatter returns were digitized by the echosounder with a vertical resolution of 1.25 cm. Depths from the echosounders were computed...
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This portion of the USGS data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in August 2012 (USGS Field Activity Number W-05-12-PS). Surface sediment was sampled using a small ponar, or 'grab', sampler between August 28 and August 30, 2012 from the R/V Frontier at a total of 57 locations in water depths between about 1 and 9 m around the delta. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. Grab samples that yielded less than 50 g of sediment were omitted from analysis and are classified as "no sample". The grain-size distributions of samples that yielded more than 50 g of sediment were...
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This portion of the USGS data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in March 2013 (USGS Field Activity Number W-01-13-PS). Surface sediment was sampled using a small ponar, or 'grab', sampler on March 4, 2013 from the R/V Frontier at a total of 48 locations in water depths between about 1 and 12 m around the delta. An additional 7 sediment samples were collected between March 6 and March 7, 2013 at low tide from intertidal locations on the delta. A handheld global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. Grab samples that yielded less than 50 g of sediment were omitted from analysis and are...
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This portion of the USGS data release presents sediment grain-size data from samples collected on the Elwha River delta, Washington, in May 2014 (USGS Field Activity Number 2014-620-FA). Surface sediment was collected on May 12, 2014, at a total of 43 locations using a small ponar, or 'grab', sampler from a small boat in water depths between approximately 1 and 12 m around the delta. A hand-held global satellite navigation system (GNSS) receiver was used to determine the locations of sediment samples. The grain-size distributions of samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Approximately 20 g of sediment was sub-sampled and 10 mL of 35 percent hydrogen peroxide...
    map background search result map search result map Surface-sediment grain-size distributions of the Elwha River delta, Washington, January 2015 Surface-sediment grain-size distributions from the Elwha River delta, Washington, September 2014 Surface-sediment grain-size distributions from the Elwha River delta, Washington, May 2014 Surface-sediment grain-size distributions from the Elwha River delta, Washington, September 2013 Surface-sediment grain-size distributions from the Elwha River delta, Washington, March 2013 Surface-sediment grain-size distributions from the Elwha River delta, Washington, August 2012 Surface-sediment grain-size distributions of the Elwha River delta, Washington, August 2022 Beach topography of the Columbia River littoral cell, Washington and Oregon, 2022 Nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon, 2022 Surface-sediment grain-size distributions from the Elwha River delta, Washington, May 2014 Surface-sediment grain-size distributions from the Elwha River delta, Washington, March 2013 Surface-sediment grain-size distributions from the Elwha River delta, Washington, August 2012 Surface-sediment grain-size distributions from the Elwha River delta, Washington, September 2014 Surface-sediment grain-size distributions of the Elwha River delta, Washington, August 2022 Surface-sediment grain-size distributions of the Elwha River delta, Washington, January 2015 Surface-sediment grain-size distributions from the Elwha River delta, Washington, September 2013 Beach topography of the Columbia River littoral cell, Washington and Oregon, 2022 Nearshore bathymetry of the Columbia River littoral cell, Washington and Oregon, 2022