Dataset description: Characterization of seafloor photographs near the mouth of the Elwha River during the first two years of dam removal (2011-2013)

We characterized seafloor sediment conditions near the mouth of the Elwha River from underwater photographs taken every four hours from September 2011 to December 2013. A digital camera was affixed to a tripod that was deployed in approximately 10 meters of water. Each photograph was qualitatively characterized as one of six categories: (1) base, or no sediment, (2) low sediment, (3) medium sediment, (4) high sediment, (5) turbid, or (6) kelp. For base conditions, no sediment was present on the seafloor. Low sediment conditions were characterized by a light dusting of sediment, medium sediment conditions were characterized by a layer of sediment that covered all rock surfaces but did not obscure the relief of the seafloor, high sediment conditions were characterized by a layer of sediment that covered all rock surfaces and obscured the relief of the seafloor. During turbid conditions, suspended sediment in the water column obscured the view of the seafloor, and during kelp conditions, blades of kelp covered the camera lens, blocking our view of the seafloor.

Version	1
Keywords	sedimentation, time series datasets, underwater photography
Data types	Photo
Format	comma-delimited text;
Amount	0.13 MB

Contacts

Contact	Melissa M Foley PCMSC_data@usgs.gov

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Location of materials and files

Public files	https://www.sciencebase.gov/catalog/file/get/593722f6e4b0f6c2d0d89aba?name=tripod_photo_classigications.csv https://doi.org/10.5066/F7MC8XHX
Metadata	https://cmgds.marine.usgs.gov/metadata/pcmsc/DataReleases/ScienceBase/DR_F7MC8XHX/tripod_photo_classifications_metadata.xml Outline - Questions and answers - Text - XML

Activities and equipment

Activity	Equipment
TD211PS	underwatercamera box corer camera
TR114PS	underwatercamera box corer camera
TR212PS	underwatercamera box corer camera
TR213PS	underwatercamera box corer camera
TR412PS	underwatercamera box corer camera
TR413PS	underwatercamera box corer camera
TR613PS	underwatercamera box corer camera
TR312PS