Andrew W. Stevens Guy Gelfenbaum Jonathan A. Warrick Ian M. Miller Heather M. Weiner 2016 comma-delimited text data release DOI:10.5066/F7T151TG Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F7T151TG https://www.sciencebase.gov/catalog/item/5ee79b4982ce3bd58d82ef38 Andrew W. Stevens Guy Gelfenbaum Jonathan A. Warrick Ian M. Miller Heather M. Weiner 2016 data release DOI:10.5066/F7T151TG Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F7T151TG This part of the data release presents bathymetry data from the Elwha River delta collected in January 2015 using a kayak. The kayak was equipped with a single-beam echosounder and a survey-grade global navigation satellite system (GNSS) receiver. Data were obtained to assess the coastal geomorphic response following the removal of two dams on the Elwha River. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify topographic and shallow-water bathymetric features. Additional information about the field activities from which these data were derived are available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2015-605-FA 20150127 20150130 ground condition at time data were collected Complete Not planned -123.566899 -123.561921 48.151053 48.143396 USGS Metadata Identifier USGS:5ee79b4982ce3bd58d82ef38 USGS Thesaurus bathymetry bathymetry measurement GPS measurement ISO 19115 Topic Category elevation Data Categories for Marine Planning Bathymetry and Elevation Marine Realms Information Bank (MRIB) keywords single-beam echo sounder Global Positioning System (GPS) observations Global Change Master Directory (GCMD) Water Depth GPS (Global Positioning System) Echo Sounders None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) Clallum County Olympic Peninsula Strait of Juan de Fuca Elwha River none USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov International Hydrographic Organization (IHO) 2008 comma-delimited text Monaco International Hydrographic Bureau Special Publication 44, 28p. https://www.iho.int/iho_pubs/standard/S-44_5E.pdf No formal attribute accuracy tests were conducted All data falls within expected ranges. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A series of benchmarks with known coordinates were established adjacent to the study area to provide geodetic control for the bathymetric survey. The positions of the benchmarks were derived from a minimum of two static GNSS occupations. The equipment for the static occupations consisted of a dual frequency Trimble R7 GNSS receiver, a fixed-height tripod, and Trimble Geodetic Model 2 antenna. The static observations were recorded internally in the receiver and the raw observations were processed using the National Geodetic Survey Online Positioning User Service (OPUS, https://www.ngs.noaa.gov/OPUS/). Estimated uncertainties in the horizontal position of the individual GNSS occupations were provided by OPUS and ranged between 0.006 m and 0.06 m with an average horizontal uncertainty of 0.02 m. The processed positions from each occupation were averaged to obtain the final reported position of the benchmark. All final positions of the survey vessel were determined using differential corrections from the base station receivers. Manufacturer reported accuracy for the differentially corrected horizontal positions for the Trimble R7 rover trajectories is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting a horizontal accuracy of survey-vessel positions to be 0.825 cm relative to the base station. The combined horizontal uncertainty from the base station coordinate solutions and rover trajectories is between 1.5 cm and 7 cm with a mean horizontal uncertainty of 3 cm. Uncertainty in the horizontal positions associated with pitch and roll of the survey vessel is unknown. Uncertainty in the final elevations are derived from the combination of uncertainty in the GNSS positioning and bathymetric sounding measurements. Manufacturer reported accuracy for the differentially corrected vertical positions for the Trimble R7 rover trajectories is 1.5 cm + 1 ppm. Baselines from the GNSS base station were typically less than 5 km, suggesting the vertical accuracy of survey vessel positions to be 2 cm relative to the base station coordinate. Combining the uncertainty in the elevation of the base station coordinates and rover positions yields a total uncertainty in the GNSS-derived survey-vessel positions of approximately 5 cm. Additional uncertainty in the final computed elevations data is related to variability in the speed of sound used to compute depths from bathymetric soundings and, thus, are depth-dependent. The speed of sound in the river was not measured and we estimate the uncertainty in the final elevations to be 2 percent of water depth. The total vertical uncertainty is calculated using Equation 1: sigmat=sqrt(a^2+(b×d)^2 ), where sigmat is the total vertical uncertainty, a is the uncertainty of the GNSS vertical position, b is the depth-dependent uncertainty factor (0.02), and d is water depth (International Hydrographic Organization, 2008). Maximum water depths surveyed by the kayak are approximately 3 m yielding a maximum total vertical uncertainty of 8 cm. Uncertainty in the vertical positions associated with pitch and roll of the kayak is unknown. Bathymetry data were collected between January 27 and January 30, 2015 in the river channel and portions of the estuary using a kayak equipped with a SonarMite single-beam echosounder and 200 kHz transducer with a 4-degree beam angle. Depths from the kayak sonar were computed assuming a sound velocity if 1,460 m/s. Positioning of the kayak was determined at 1-Hz using a Trimble R7 GNSS receiver and Trimble Zephyr Model 2 antenna operating in real-time kinematic (RTK) mode. Differential corrections were transmitted by a VHF radio to the GNSS receiver on the kayak at 1-Hz from a 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. Bathymetric soundings and positioning data were recorded on a Trimble TSC2 data collector. 20150130 Raw data were reviewed and quality control was applied using Trimble Business Center software. Elevations relative to the NAVD88 vertical datum were computed using a static offset of -20.11 m based on the National Geodetic Survey Geoid09 offset computed at the base station locations. The final data are projected in Cartesian coordinates using the Washington State Plane North, meters coordinate system. 20150205 All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution. 20161025 Data and metadata files were moved to a different location on ScienceBase, resulting in a change of ID number in the Online_Linkage and Network_Resources URLs of the metadata. In addition, edits were made as needed to bring the metadata up to current PCMSC standards including standardizing doi# links, correcting typos, adding disclaimers, and refining keywords. Point of Contact and Metadata Contact information sections were changed to static PCMSC contact information. No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. 20200615 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Performed minor edits to the metadata to correct typos. No data were changed. 20211013 U.S. Geological Survey Susan A. Cochran Geologist Mailing and Physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7545 scochran@usgs.gov Point Lambert Conformal Conic 47.5 48.73333333333333 -120.8333333333333 47.0 500000.0 0.0 coordinate pair 0.001 0.001 METERS NAD83 (CORS96) GRS_1980 6378137.0 298.257222101 North American Vertical Datum of 1988 0.001 meters Explicit elevation coordinate included with horizontal coordinates Attribute Table Table containing attribute information associated with the dataset Producer defined Survey_Date The date corresponding to the start of the multi-day survey in mm/dd/yyyy format Producer Defined 01/27/2015 01/27/2015 date in mm/dd/yyyy format Longitude Longitude coordinate of data point relative to the North American Datum of 1983 (CORS96 realization) Producer defined -123.566899 -123.561921 Decimal degrees Latitude Latitude coordinate of data point relative to the North American Datum of 1983 (CORS96 realization) Producer defined 48.143396 48.151053 Decimal degrees X East coordinate of data point relative to the North American Datum of 1983 (CORS96 realization), projected in the Washington State Plane, North, meters, coordinate system Producer defined 296645.520 296997.370 meters Y North coordinate of data point relative to the North American Datum of 1983 (CORS96 realization), projected in the Washington State Plane, North, meters, coordinate system Producer defined 130725.020 131584.970 meters Ellip_Ht_m Height in meters of data point with reference to the reference ellipsoid Producer defined -20.340 -17.580 meters Ortho_Ht_m Height in meters of data point with reference to the North American Vertical Datum of 1988 at the base station (-20.11 m above ellipsoid height). Producer defined -0.230 2.530 meters U.S. Geological Survey - Science Base U.S. Geological Survey mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Bathymetry data are available as a comma-delimited text file (ew15_jan_kayak.txt), along with associated metadata. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. comma-delimited text Matlab 9.0.0.341360 text comma-delimited text file 0.02 https://www.sciencebase.gov/catalog/file/get/5ee79b4982ce3bd58d82ef38 https://www.sciencebase.gov/catalog/item/58334946e4b046f05f21f5f3 https://doi.org/10.5066/F7T151TG https://doi.org/10.5066/F72N51GC Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of bathymetry data and metadata. The second link points to a landing page for all the bathymetry data collected in January 2015 in the Elwha River delta. The third link points a landing page for all data collected in January 2015 in the Elwha River Delta. The fourth link points to a landing page for all dates of the bathymetry, topography, and sediment grain-size data from the Elwha River delta. None 20211013 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998