Blackwood and Parolski, 2001
Sample, photographic and video navigation for locations 1, 2 and (up to time: 13:31 for location 3) used navigation from the video time stamp, as navigation was not recorded in HYPACK. HYPACK navigation was available for bottom sample 3 location and from 13:31 to the end of file for photographs and video at location 3.
Grab samples of the surficial sediment were collected at 15 stations, typically at the end of a drift. The upper 2 cm of sediment was scraped from the surface of the sample for texture analysis. Sediment samples were collected at locations with relatively fine-grained sediment (sand or mud). Samples were not collected in gravel or cobble areas where gravel prevented full closure of the sampler and resulted in a washed-out sample.
A total of 13 bottom samples were submitted for grain-size analysis. Two partially recovered, washed-out samples were not submitted. Grain-size analysis was performed at the USGS Sediment Laboratory at WHCMSC using methods described by Poppe and others (2005).
Sample locations for sample 1 and 2 were read from the video time stamp, as HYPACK navigation was not available.
The point shapefile was used as an input for a VACExtras (version 1.8), a VB collection of tools developed by VeeAnn Cross (USGS-WHCMSC), which converts point data to a new polyline shapefile, based on the order of records contained within one attribute field.
A 'length' field was added to the attribute table using XTOOLS 6.2.0. Length is stored in meters.
A 'hyperlink' field was added to the attribute table and used to hotlink to the bottom photos.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Video data in mp4 format are available upon request.