Dataset Identification:
Resource Abstract:
- description: Lake Mead is a large interstate reservoir located in the Mojave Desert of southeastern Nevada and northwestern
Arizona. It was impounded in 1935 by the construction of Hoover Dam and is one of a series of multi-purpose reservoirs on
the Colorado River. The lake extends 183 km from the mouth of the Grand Canyon to Black Canyon, the site of Hoover Dam, and
provides water for residential, commercial, industrial, recreational, and other non-agricultural users in communities across
the southwestern United States. Extensive research has been conducted on Lake Mead, but a majority of the studies have involved
determining levels of anthropogenic contaminants such as synthetic organic compounds, heavy metals and dissolved ions, furans/dioxins,
and nutrient loading in lake water, sediment, and biota (Preissler, et al., 1998; Bevans et al, 1996; Bevans et al., 1998;
Covay and Leiker, 1998; LaBounty and Horn, 1997; Paulson, 1981). By contrast, little work has focused on the sediments in
the lake and the processes of deposition (Gould, 1951). To address these questions, sidescan-sonar imagery and high-resolution
seismic-reflection profiles were collected throughout Lake Mead by the USGS in cooperation with researchers from University
of Nevada Las Vegas (UNLV). These data allow a detailed mapping of the surficial geology and the distribution and thickness
of sediment that has accumulated in the lake since the completion of Hoover Dam. Results indicate that the accumulation of
post-impoundment sediment is primarily restricted to former river and stream beds that are now submerged below the lake while
the margins of the lake appear to be devoid of post-impoundment sediment. The sediment cover along the original Colorado River
bed is continuous and is typically greater than 10 m thick through much of its length. Sediment thickness in some areas exceeds
35 m while the smaller tributary valleys typically are filled with less than 4 m of sediment. Away from the river beds that
are now covered with post-impoundment sediment, pre-impoundment alluvial deposits and rock outcrops are still exposed on the
lake floor.; abstract: Lake Mead is a large interstate reservoir located in the Mojave Desert of southeastern Nevada and northwestern
Arizona. It was impounded in 1935 by the construction of Hoover Dam and is one of a series of multi-purpose reservoirs on
the Colorado River. The lake extends 183 km from the mouth of the Grand Canyon to Black Canyon, the site of Hoover Dam, and
provides water for residential, commercial, industrial, recreational, and other non-agricultural users in communities across
the southwestern United States. Extensive research has been conducted on Lake Mead, but a majority of the studies have involved
determining levels of anthropogenic contaminants such as synthetic organic compounds, heavy metals and dissolved ions, furans/dioxins,
and nutrient loading in lake water, sediment, and biota (Preissler, et al., 1998; Bevans et al, 1996; Bevans et al., 1998;
Covay and Leiker, 1998; LaBounty and Horn, 1997; Paulson, 1981). By contrast, little work has focused on the sediments in
the lake and the processes of deposition (Gould, 1951). To address these questions, sidescan-sonar imagery and high-resolution
seismic-reflection profiles were collected throughout Lake Mead by the USGS in cooperation with researchers from University
of Nevada Las Vegas (UNLV). These data allow a detailed mapping of the surficial geology and the distribution and thickness
of sediment that has accumulated in the lake since the completion of Hoover Dam. Results indicate that the accumulation of
post-impoundment sediment is primarily restricted to former river and stream beds that are now submerged below the lake while
the margins of the lake appear to be devoid of post-impoundment sediment. The sediment cover along the original Colorado River
bed is continuous and is typically greater than 10 m thick through much of its length. Sediment thickness in some areas exceeds
35 m while the smaller tributary valleys typically are filled with less than 4 m of sediment. Away from the river beds that
are now covered with post-impoundment sediment, pre-impoundment alluvial deposits and rock outcrops are still exposed on the
lake floor.
Citation
- Title Boomer Seismic Survey Tracklines - Lake Mead 2001.
-
- creation Date
2018-05-21T10:21:14.920506
Resource language:
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Metadata data stamp:
2018-08-06T21:46:46Z
Resource Maintenance Information
- maintenance or update frequency:
- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T21:46:46Z
Metadata contact
-
pointOfContact
- organisation Name
CINERGI Metadata catalog
-
- Contact information
-
-
- Address
-
- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:88612785-80e8-4e94-b369-083cbe417d11
Metadata record format is ISO19139 XML (MD_Metadata)