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Sonar Mapping - U.S. Inland

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Sonar Mapping:
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Sonar mapping of the sea floor provides CMG researchers with very useful data. Some sonar systems map the topography of the sea floor by recording large swaths of depth measurements. Others collect information useful in determining the geologic makeup of the sea floor and the sub-surface structure.

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Items below are listed from most recently updated to least recently updated.

These are results 1 through 7 of 7 matches.

General Information
USGS Open-File Report 03-320, Mapping the floor of Lake Mead (Nevada and Arizona): Preliminary discussion and GIS data release, Title Page
Description: This USGS Open-File Report describes the morphology of the floor of Lake Mead concentrating on post-impoundment sediment distribution and thickness.
updated: 2004-05-07 pages include:

Research Project
Pacific Sea-Floor Mapping
Description: Images of the sea floor off the coasts of California, Hawaii, Gulf of Mexico, and Lake Tahoe. Backscatter and swath bathymetry, regular and in 3-D!
updated: 2003-10-29 pages include:

Publication
USGS OFR 03-265 - Grand Canyon Riverbed Sediment Changes, Experimental Release of September 2000 - A Sample Data Set
Description: An experimental water release from the Glen Canyon Dam into the Colorado River above Grand Canyon was conducted in September 2000 by the U.S. Bureau of Reclamation. The U.S. Geological Survey (USGS) conducted sidescan sonar surveys between Glen Canyon Dam (mile -15) and Diamond Creek (mile 220), Arizona (mile designations after Stevens, 1998) to determine the sediment characteristics of the Colorado River bed before and after the release. The first survey (R3-00-GC, 28 Aug to 5 Sep 2000) was conducted before the release when the river was at its Low Summer Steady Flow (LSSF) of 8,000 cfs. The second survey (R4-00-GC, 10 to 18 Sep 2000) was conducted immediately after the September 2000 experimental release when the average daily flow was as high as 30,800 cfs as measured below Glen Canyon Dam (Figure 2). Riverbed sediment properties interpreted from the sidescan sonar images include sediment type and sandwaves; overall changes in these properties between the two surveys were calculated.
updated: 2003-10-29 pages include:

Research Project
USGS Sediment Studies in Lake Mead
Description: Lake Mead is one of the world's largest man-made reservoirs at about 600 sq km, roughly the size of Chicago. Lake Mead started to form on the Colorado River in 1935, upon completion of the Hoover Dam. Since then, the lake has supplied water to agricultural, industrial, recreational, and municipal users in the southwestern United States.
updated: 2002-05-15 pages include:

Publication
Surficial Geology and Distribution of Post-Impoundment Sediment in Las Vegas Bay, Lake Mead, U.S. Geological Open-File Report 01-070, Title Page
Description: Sidescan sonar imagery and seismic-reflection profiles were collected in the northwestern part of Las Vegas Bay to map the distribution and volume of sediment that has accumulated in this part of Lake Mead since impoundment. The mapping suggests that three ephemeral streams are the primary source of this sediment, and of these, Las Vegas Wash is the largest. Two deltas off the mouth of Las Vegas Wash formed at different lake elevations and account for 41% of the total volume of post-impoundment sediment within the study area. Deltas off the other two washes (Gypsum and Government) account for only 6% of the total volume. The sediment beyond the front of the deltas is primarily mud, and it only occurs in valley floors, where it forms a flat-lying blanket that is mostly less than 1.5 m thick. Although a thin layer, the fine-grained sediment accounts for approximately 53% of the total post-impoundment sediment volume of 5.7 x 106 m3 that has accumulated in the study area. This sediment appears to have been transported several kilometers from the river sources by density flows.
updated: 2001-09-07 pages include:

Educational Materials
USGS TerraWeb for Kids!
Description: Satellite and sonar images, remote sensing education, and activities just for KIDS!
updated: 2001-08-01 pages include:

Research Project
Grand Canyon Colorado River Studies
Description: Studies of sediment transport in the Grand Canyon, Arizona - using ocean research techniques to study a river system.
updated: 1997-06-09 pages include:

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Coastal and Marine Geology Program > Online Science Resource Locator > Sonar Mapping - U.S. Inland