Abstract:
Two 21-day field operations were conducted in 1997 and 1998 in the estuaries and on the inner continental shelf off the northern Oregon and southern Washington coast. These cruises aboard the R/V Corliss were run in order to generate reconnaissance maps of the seafloor geology and the shallow subsurface stratigraphy using sidescan sonar and seismic-reflection mapping techniques. The 1998 cruise also collected sediment grab samples, bottom photographs, and video images to verify the sidescan-sonar imagery and to document the seafloor geology. The combination of these data with previously collected sediment sample data (Robert, 1974; Nittrouer, 1978; and Smith et. al., 1980) has been used to define the extent and lithology of shelf sediments associated with the Columbia River littoral cell. This work is one component of a larger project studying the erosion of the Washington and Oregon coast and is being coordinated by the U.S. Geological Survey and the Washington State Department of Ecology. The reason for collecting these data is to provide a regional synthesis of the offshore geology to support a wide variety of management decisions and to provide a basis for further process-oriented investigations.
Purpose:
This GIS overlay is a component of the Southwest Washington Coastal Erosion ArcView GIS database. These grid coverages represents the surfaces at 1000 year intervals from 11,000 years BP to 1,000 years BP. Of significant note - these surfaces represent the depth to the incremental surface from the present day zero value. This is different that the surfacesdem which have been shifted such that the 0 value falls on the shoreline at that particular time interval.
Supplemental_Information:
Roberts, R.W., 1974, Marine sedimentological data of the Washington continental shelf: University of Washington, Department of Oceanography Special Report 57, 129p.
Nittrouer, C.A., 1978, The process of detrital sediment accumulation in a continental shelf environment: an examination of the Washington shelf: PhD Thesis, University of Washington, Seattle, WA. 243p.
Smith, J.M., Messmer, L.W., Phipps, J.B., Samuelson, D.F., and Schermer, E.D., 1980, Grays Harbor and Chehalis River improvements to navigation environmental studies - Grays Harbor ocean disposal study: literature review and preliminary benthic sampling: U.S. Army Corps of Engineers Internal Report.
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:452f444f-c957-44bc-9886-ae967274b830
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Holocene
Theme_Keyword: evolution
Theme_Keyword: raster
Theme_Keyword: grid
Theme_Keyword: ArcView
Theme_Keyword: SWCES
Theme_Keyword: Southwest Washington Coastal Erosion Study
Theme:
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:
Place_Keyword_Thesaurus: None
Place_Keyword: Pacific Ocean
Place_Keyword: Washington
Place_Keyword: Oregon
Place_Keyword: WA
Place_Keyword: OR
Place_Keyword: Inner shelf off Columbia River
Place_Keyword: Columbia River Littoral Cell
Place_Keyword: Willapa Bay
Place_Keyword: Columbia River
Place_Keyword: Washington continental shelf
Place_Keyword: Washington coastal zone
Place_Keyword: Grays Harbor
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 1; ESRI ArcCatalog 8.1.1.649
