Other ID: IB T-56-00-GC
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Lake Mead, Arizona, Nevada, United States, North America,
Principal Investigator(s): David Twichell
Affiliate Investigator(s): Mark Rudin, UNLV
Information Specialist(s): David Twichell
Data Type(s): Biological Field Study: Experiments, Location-Elevation: Navigation
Scientific Purpose/Goals: Piston and gravity coring with a coring system provided by UNLV. Cores were primarily collected in Las Vegas Bay to describe sediment thickness and sediment types.
Start Date: 2000-07-11
Start Port/Location: Lake Mead Marina, NPS facility
End Date: 2000-07-18
End Port/Location: Lake Mead Marina, NPS facility
Equipment Used: Corer - gravity, Corer - slow, Plugger GPS
Information to be Derived:
Summary of Activity and Data Gathered: Cores were attempted at 17 stations using a variety of coring techniques. Cores were collected at 14 stations. Some cores were collected by divers, and 3 different gravity corers were tested as well. Most cores were collected in less than 30 m water where seismic profiles showed sediments mostly to be 0.5-2 m thick. Most of these cores were 30-70 cm long. Core recovery was poor because the fine-grained unconsolidated sediment washed out of the corer as it was being brought back to the surface. Two cores were collected in the deep part of the lake (>130 m), and these cores successfully recovered 160 and 200 cm long cores.
Staff: VeeAnn Atnipp Cross, Kenneth E. Parolski, Richard Rendigs
Notes: Original Center People field contained: Ken Parolski - mobilization and electronics technician; Rick Rendigs - coring and sampling technician; VeeAnn Cross - set up the navigation system during the cruise mobilization.
Cross, V.A.A., and Twichell, David C., 2003, Archive of seismic-reflection data collected during USGS Cruise Lake Mead 00027 in Lake Mead - Nevada, 1-6 June, 2000: U.S. Geological Survey Open-File Report 2003-4, DVD-ROM, .
Twichell, D.C., and Cross, V.A., 2009, Surficial geology of the floor of Lake Mead (Arizona and Nevada) as defined by sidescan-sonar imagery, lake-floor topography, and post-impoundment sediment thickness: U.S. Geological Survey Open-File Report 2009-1150, CD-ROM, URL: http://pubs.usgs.gov/of/2009/1150/.
Twichell, D.C., Cross, VeeAnn A., and Belew, Stephen D., 2004, Mapping the floor of Lake Mead (Nevada and Arizona); preliminary discussion and GIS data release: U.S. Geological Survey Open-File Report 2003-320, DVD, URL: http://pubs.usgs.gov/of/2003/of03-320/.
Twichell, D.C., Cross, VeeAnn A., Rudin, Mark J., and Parolski, Kenneth F., 2000, Surficial geology and distribution of post-impoundment sediment of the western part of Lake Mead based on a sidescan sonar and high-resolution seismic-reflection survey: U.S. Geological Survey Open-File Report 99-581, 28 p. URL: http://pubs.usgs.gov/of/of99-581/.
Twichell, D.C., Cross, VeeAnn A., Rudin, Mark J., Parolski, Kenneth F., and Rendigs, Richard R., 2001, Surficial geology and distribution of post-impoundment sediment in Las Vegas Bay, Lake Mead: U.S. Geological Survey Open-File Report 01-070, 27 p. URL: http://pubs.usgs.gov/of/of01-070/.