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Shoreline survey data collected at Hobuck, Tsoo-Yess, and Ozette, on Makah Tribal Lands, 2018–2022

Citation

Miller, Ian; Akmajian, Adrianne (2022), Shoreline survey data collected at Hobuck, Tsoo-Yess, and Ozette, on Makah Tribal Lands, 2018–2022, Dryad, Dataset, https://doi.org/10.5061/dryad.n02v6wx1b

Abstract

Survey grade location and elevation data were collected on three beaches on the Makah Tribe's lands on the northwest tip of the Olympic Peninsula between 2018 and 2022 for the purpose of evaluating trends and patterns in shoreline morphology. Data were collected with an RTK-DGPS system, connected to the Washington State Virtual Reference Network and providing sub-decimeter vertical precision, along cross-shore oriented transects on Hobuck, Tsoo-Yess beaches, and on the shoreline fringing the Ozette reservation. During some surveys, oblique photos of the shoreline were also collected, frequently from near the average low tide elevation looking landward, but in some cases, from other elevations or with other perspectives of the beach. 

Text files for each survey date are provided here, containing all points collected during the survey. Horizontal positions are provided in latitude and longitude, referenced to NAD83(2011), and the vertical data are referenced to meters relative to NAVD88(Geoid18). All survey data were collected either with the GNSS system mounted on a 2.05 m rover pole, held level as a transect line was traced in a cross-shore orientation on the beach, or with the system mounted on a survey backpack.  

The associated text files include the horizontal (HRMS) and vertical (VRMS) root-mean-square errors estimated by the GNSS system, the date and time of collection (referenced to local Pacific time), as well as the RTK-DGPS status reported by the GNSS system at the time each point was collected. The description assigned to each point at the time of collection is also provided. Most data in these files are intended to be used to calculate beach profiles and assigned a "topo" designator in the text file, but other data descriptions were assigned in some cases, notably the location and number of large pieces of wood intersecting a profile, the first occurrence of vegetation on a profile, the first occurrence of dense vegetation on a profile, or in some instances the location of storm wrack lines observed during surveys.

Methods

Data were collected using GNSS survey methods, with a differential GPS operating in Real Time Kinematic (RTK) mode. All data were collected with either an AshTech ProMark 200 or an iGage IG8 RTK-DGPS system connected to the Washington State Reference Network. Horizontal positions are referenced to NAD83(2011), and the vertical data are referenced to NAVD88(Geoid18). All survey data were collected with the GNSS system mounted on a 2.05 m rover pole, held level as a transect line was traced in a cross-shore orientation on the beach, or mounted on a backpack worn by a walking surveyor. The horizontal position of each survey point was initially exported from the survey controller in Washington State Plane Zone North metric coordinates, but converted to latitude and longitude using Andrew Steven's sp_proj in Matlab R2022a (available at SP_PROJ - File Exchange - MATLAB Central (mathworks.com))

The associated text files include the horizontal (HRMS) and vertical (VRMS) root-mean-square errors estimated by the GNSS system, as well as the RTK-DGPS status reported by the GNSS system at the time each point was collected. Times are referenced to local Pacific time (either PST or PDT).

Most data in these files are intended to be used to calculate beach profiles, but other data types were collected during each survey:

  1. The location of the most seaward presence of large wood on the profile.  The number of large pieces of wood intersecting the transect was also logged as a description attribute for that point.
  2. The location of the most seaward presence of vegetation, and the location of the most seaward location of a vegetation line (vegetation coverage > 50%).
  3. Location of storm-deposited debris (typically large and small wood) encountered in dunes.

Additionally, digital photographs of the beach collected during each survey are also available in this archive.

Usage Notes

Data as presented can be easily visualized in a GIS.  To convert the survey data into profile views a transect origination point is necessary.  Those are available in a table in the project report included in the archive.  

Funding

Washington Coastal Conservation and Restoration Initiative, Award: 18-2137