Originator: U.S. Geological Survey
Elevation of paleochannel unconformities underlying the inner shelf of Long Bay (Grid)
Geospatial_Data_Presentation_Form: raster digital data
Series_Name: Open-File Report
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Originator: Baldwin, W.E.
Originator: Denny, J.F.
Originator: Schwab, W.C.
Originator: Gayes, P.T.
Originator: Morton, R.A.
Originator: Driscoll, N.W.
Geologic Framework Studies of South Carolina's Long Bay from Little River Inlet to Winyah Bay, 1999-2003; Geospatial Data Release
Series_Name: Open-File Report
Publication_Place: Reston, VA
Other_Citation_Details: 1 DVD-ROM
Publisher: U.S. Geological Survey
In 1999, the U.S. Geological Survey (USGS), in partnership with the South Carolina Sea Grant Consortium, began a study to investigate processes affecting shoreline change along the northern coast of South Carolina, focusing on the Grand Strand region. Previous work along the U.S. Atlantic coast shows that the structure and composition of older geologic strata located seaward of the coast heavily influences the coastal behavior of areas with limited sediment supply, such as the Grand Strand. By defining this geologic framework and identifying the transport pathways and sinks of sediment, geoscientists are developing conceptual models of the present-day physical processes shaping the South Carolina coast. The primary objectives of this research effort are: 1) to provide a regional synthesis of the shallow geologic framework underlying the coastal upland, shoreface and inner continental shelf, and define its role in coastal evolution and modern beach behavior; 2) to identify and model the physical processes affecting coastal ocean circulation and sediment transport, and to define their role in shaping the modern shoreline; and 3) to identify sediment sources and transport pathways; leading to construction of a regional sediment budget.
This data set contains a surface depicting the elevations paleochannel unconformities underlying the inner shelf of Long Bay, offshore of the South Carolina Grand Strand. Chirp seismic data collected with Benthos SIS-1000 and Edgetech SB-512 acquisition systems were processed using SIOSEIS (Scripps Institute of Oceanography) and Seismic Unix (Colorado School of Mines) to produce segy files and jpg images of the profiles. Data were then imported into Landmark SeisWorks, a digital seismic interpretation package, where the paleochannel unconformities were interpreted and digitized to calculate their depth beneath the seafloor. Interpreted horizons were exported at every 50th shot as xyz points, and imported to ArcGIS for interpolation into a 100-m raster grid.
Currentness_Reference: ground condition
Maintenance_and_Update_Frequency: None planned
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: Woods Hole Science Center
Theme_Keyword: Marine Geology
Theme_Keyword: Seismic Reflection Profile
Theme_Keyword: Benthos SIS-1000
Theme_Keyword: Edgetech SB-512
Theme_Keyword: ArcGIS Raster
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: scientific interpretation
Theme_Keyword: geologic structure
Theme_Keyword: geospatial datasets
Theme_Keyword: marine geology
Theme_Keyword: marine geophysics
Place_Keyword: South Carolina
Place_Keyword: Grand Strand
Place_Keyword: Long Bay
Place_Keyword: North Myrtle Beach
Place_Keyword: Myrtle Beach
Place_Keyword: Garden City
Place_Keyword: Pawleys Island
Place_Keyword: Waites Island
Place_Keyword: Southeast United States
Place_Keyword: United States
Place_Keyword: Atlantic Ocean
These data are NOT to be used for navigation purposes. Mariners should refer to the appropriate nautical chart.
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Contact_Person: Wayne Baldwin
Contact_Organization: U.S. Geological Survey
Address_Type: mailing and physical address
Contact_Voice_Telephone: 508-548-8700 x2226
Address: 384 Woods Hole Rd.
City: Woods Hole
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