Beach Surveys and Sediment Characterization from Arch Cape, Oregon

Related article: Nuclear Magnetic Resonance reveals the subsurface composition of composite cobble beaches This repository contains topographic survey data and sediment characterization from a field study conducted on a natural composite beach at Arch Cape, Oregon, USA. The data was collected as part of a surface Nuclear Magnetic Resonance (sNMR) field experiment on 6 and 7 August 2024. During the experiment, topographic surveys were conducted covering the beach from the water line to the back of the cobble berm. Additionally, GPS locations were collected along the toe of the cobble and at 7 locations where sNMR measurements were performed. At each sNMR location, a hole was dug to visually determine the subsurface composition, including water table depth and sand, pebble, and cobble layer thicknesses. A winter beach profile collected on 19 January 2024 is also included in the repository because it was used as context for the sNMR measurement. Coordinate System: Oregon NorthElevation Datum: NAVD88 AC_20240119.csv: Winter beach profile; Columns: easting, northing, elevation, distance along transect, offset from line, feature codes, transect name AC_20240807.csv: Summer beach profile; Columns: easting, northing, elevation, distance along transect, offset from line, feature codes, transect name; AC_20240807_NMRlocations.csv: Locations of 7 sNMR measurements; Columns: easting, northing, elevation, station number (1-8), feature type process_survey_transects.py: Python script for processing raw GPS survey data into cross-shore transects. Points are filtered by a maximum offset (3 m) and binned at 0.5 m intervals. The code also generates quality control figures (see below). The code was adapted from WA Department of Ecology MATLAB code by H.G. Bond. AC_20240807_map.png and AC_20240807_profiles.png: Overview and quality control figures of the beach survey on 7 August 2024. sediment_description_ArchCape.docx: Field notes documenting the subsurface sediment characteristics at each sNMR measurement location.