Dann S Blackwood (Former Employee)
Science and Products
Filter Total Items: 43
Surficial geology of the sea floor in Long Island Sound offshore of Orient Point, New York
The U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), and the Connecticut Department of Environmental Protection (CT DEP) are working cooperatively to map and interpret features of the sea floor along the northeastern coast of the United States. This report presents multibeam bathymetry and sidescan-sonar data obtained during NOAA survey H11446, which was c
Authors
K. Y. McMullen, L. J. Poppe, W. W. Danforth, D.S. Blackwood, J.D. Schaer, M.R. Guberski, D.A. Wood, E. F. Doran
Seabed photographs, sediment texture analyses, and sun-illuminated sea floor topography in the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts
The U.S. Geological Survey, in collaboration with National Oceanic and Atmospheric Administration's National Marine Sanctuary Program, conducted seabed mapping and related research in the Stellwagen Bank National Marine Sanctuary region from 1993 to 2004. The mapped area is approximately 3,700 km (1,100 nmi) in size and was subdivided into 18 quadrangles. An extensive series of sea-floor maps of t
Authors
Page C. Valentine, Leslie B. Gallea, Dann S. Blackwood, Erin R. Twomey
Sea-floor geology and character offshore of Rocky Point, New York
The U.S. Geological Survey (USGS), the Connecticut Department of Environmental Protection, and the National Oceanic and Atmospheric Administration (NOAA) have been working cooperatively to interpret surficial sea-floor geology along the coast of the Northeastern United States. NOAA survey H11445 in eastern Long Island Sound, offshore of Plum Island, New York, covers an area of about 12 square kilo
Authors
L. J. Poppe, K. Y. McMullen, S.D. Ackerman, D.S. Blackwood, B. J. Irwin, J.D. Schaer, P.G. Lewit, E. F. Doran
Surficial geology of the sea floor in Long Island Sound offshore of Plum Island, New York
The U.S. Geological Survey (USGS), the Connecticut Department of Environmental Protection, and the National Oceanic and Atmospheric Administration (NOAA) have been working cooperatively to interpret surficial sea-floor geology along the coast of the Northeastern United States. NOAA survey H11445 in eastern Long Island Sound, offshore of Plum Island, New York, covers an area of about 12 square kilo
Authors
K. Y. McMullen, L. J. Poppe, W. W. Danforth, D.S. Blackwood, J.D. Schaer, A.J. Ostapenko, K.A. Glomb, E. F. Doran
Geological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts
Gridded bathymetry and sidescan-sonar imagery together cover approximately 37.3 square kilometers of sea floor in the vicinity of Edgartown Harbor, Massachusetts. Although originally collected for charting purposes during National Oceanic and Atmospheric Administration hydrographic survey H11346, these acoustic data, and the sea-floor stations and seismic-reflection lines subsequently occupied to
Authors
L. J. Poppe, K. Y. McMullen, D. S. Foster, D.S. Blackwood, S. J. Williams, S.D. Ackerman, M. S. Moser, K.A. Glomb
Sea-Floor Character and Sedimentary Processes in the Vicinity of Woods Hole, Massachusetts
Continuous-coverage multibeam bathymetric models and sidescan-sonar imagery have been verified with high-resolution seismic-reflection profiles, sediment sampling, and bottom photography. Together these data layers provide detailed base maps that yield topographic, compositional, and environmental perspectives of the sea floor in the vicinity of Woods Hole, an important harbor and major passage be
Authors
Lawrence J. Poppe, Katherine Y. McMullen, David S. Foster, Dann S. Blackwood, S. Jeffress Williams, Seth D. Ackerman, Steven R. Barnum, Rick T. Brennan
Sea-floor character and sedimentary processes of Great Round Shoal Channel, offshore Massachusetts
The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder and sidescan-sonar data collected in the vicinity of Great Round Shoal Channel, the main passage through shoals located at the eastern entrance to Nantucket Sound, Massachusetts, and from the stations occupied to verify these acoustic data (fig. 1). Basic data layers show sea-floor topography,
Authors
Lawrence J. Poppe, Seth D. Ackerman, David S. Foster, Dann S. Blackwood, S. Jeffress Williams, M. S. Moser, H.F. Stewart, K.A. Glomb
Sea-floor character and surface processes in the vicinity of Quicks Hole, Elizabeth Islands, Massachusetts
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Massachusetts Office of Coastal Zone Management (MA CZM), is producing detailed geologic maps of the coastal sea floor. The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder and sidescan sonar surveys conducted in the vicinity
Authors
Lawrence J. Poppe, Seth D. Ackerman, David S. Foster, Dann S. Blackwood, Bradford Butman, M. S. Moser, H.F. Stewart
The occurrence of the colonial ascidian Didemnum sp. on Georges Bank gravel habitat: ecological observations and potential effects on groundfish and scallop fisheries
The colonial ascidian Didemnum sp. is present on the Georges Bank fishing grounds in a gravel habitat where the benthic invertebrate fauna has been monitored annually since 1994. The species was not noted before 2002 when large colonies were first observed; and by 2003 and 2004 it covered large areas of the seabed at some locations. The latest survey in 2005 documented the tunicate's presence in t
Authors
P. C. Valentine, J.S. Collie, R.N. Reid, R. G. Asch, Vincent G. Guida, D.S. Blackwood
Ecological observations on the colonial ascidian Didemnum sp. in a New England tide pool habitat
The colonial ascidian Didemnum sp. has colonized northwestern Atlantic coastal habitats from southern Long Island, New York, to Eastport, Maine. It is also present in offshore habitats of the Georges Bank fishing grounds. It threatens to alter fisheries habitats and shellfish aquacultures.
Observations in a tide pool at Sandwich, MA from December 2003 to February 2006 show that Didemnum sp. toler
Authors
P. C. Valentine, M.R. Carman, D.S. Blackwood, E.J. Heffron
Geological Interpretation of Bathymetric and Backscatter Imagery of the Sea Floor off Eastern Cape Cod, Massachusetts
The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder data collected off Eastern Cape Cod, Massachusetts, and from the stations occupied to verify these acoustic data. The basic data layers show sea-floor topography, sun-illuminated shaded relief, and backscatter intensity; interpretive layers show the distributions of surficial sediment and sedi
Authors
Larry J. Poppe, Valerie F. Paskevich, Bradford Butman, Seth D. Ackerman, William W. Danforth, Dave S. Foster, Dann S. Blackwood
Processes influencing the transport and fate of contaminated sediments in the coastal ocean — Boston Harbor and Massachusetts Bay
No abstract available.
Authors
P. Soupy Alexander, Dann S. Blackwood, Jonathan Borden, Michael A. Casso, John Crusius, Joanne Goudreau, Linda H. Kalnejais, Paul J. Lamothe, William R. Martin, Marinna A. Martini, Sandra M. Milbert, Richard R. Rendigs, Frederick L. Sayles, Richard P. Signell, Page C. Valentine, John C. Warner
Science and Products
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Filter Total Items: 43
Surficial geology of the sea floor in Long Island Sound offshore of Orient Point, New York
The U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), and the Connecticut Department of Environmental Protection (CT DEP) are working cooperatively to map and interpret features of the sea floor along the northeastern coast of the United States. This report presents multibeam bathymetry and sidescan-sonar data obtained during NOAA survey H11446, which was cAuthorsK. Y. McMullen, L. J. Poppe, W. W. Danforth, D.S. Blackwood, J.D. Schaer, M.R. Guberski, D.A. Wood, E. F. DoranSeabed photographs, sediment texture analyses, and sun-illuminated sea floor topography in the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts
The U.S. Geological Survey, in collaboration with National Oceanic and Atmospheric Administration's National Marine Sanctuary Program, conducted seabed mapping and related research in the Stellwagen Bank National Marine Sanctuary region from 1993 to 2004. The mapped area is approximately 3,700 km (1,100 nmi) in size and was subdivided into 18 quadrangles. An extensive series of sea-floor maps of tAuthorsPage C. Valentine, Leslie B. Gallea, Dann S. Blackwood, Erin R. TwomeySea-floor geology and character offshore of Rocky Point, New York
The U.S. Geological Survey (USGS), the Connecticut Department of Environmental Protection, and the National Oceanic and Atmospheric Administration (NOAA) have been working cooperatively to interpret surficial sea-floor geology along the coast of the Northeastern United States. NOAA survey H11445 in eastern Long Island Sound, offshore of Plum Island, New York, covers an area of about 12 square kiloAuthorsL. J. Poppe, K. Y. McMullen, S.D. Ackerman, D.S. Blackwood, B. J. Irwin, J.D. Schaer, P.G. Lewit, E. F. DoranSurficial geology of the sea floor in Long Island Sound offshore of Plum Island, New York
The U.S. Geological Survey (USGS), the Connecticut Department of Environmental Protection, and the National Oceanic and Atmospheric Administration (NOAA) have been working cooperatively to interpret surficial sea-floor geology along the coast of the Northeastern United States. NOAA survey H11445 in eastern Long Island Sound, offshore of Plum Island, New York, covers an area of about 12 square kiloAuthorsK. Y. McMullen, L. J. Poppe, W. W. Danforth, D.S. Blackwood, J.D. Schaer, A.J. Ostapenko, K.A. Glomb, E. F. DoranGeological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts
Gridded bathymetry and sidescan-sonar imagery together cover approximately 37.3 square kilometers of sea floor in the vicinity of Edgartown Harbor, Massachusetts. Although originally collected for charting purposes during National Oceanic and Atmospheric Administration hydrographic survey H11346, these acoustic data, and the sea-floor stations and seismic-reflection lines subsequently occupied toAuthorsL. J. Poppe, K. Y. McMullen, D. S. Foster, D.S. Blackwood, S. J. Williams, S.D. Ackerman, M. S. Moser, K.A. GlombSea-Floor Character and Sedimentary Processes in the Vicinity of Woods Hole, Massachusetts
Continuous-coverage multibeam bathymetric models and sidescan-sonar imagery have been verified with high-resolution seismic-reflection profiles, sediment sampling, and bottom photography. Together these data layers provide detailed base maps that yield topographic, compositional, and environmental perspectives of the sea floor in the vicinity of Woods Hole, an important harbor and major passage beAuthorsLawrence J. Poppe, Katherine Y. McMullen, David S. Foster, Dann S. Blackwood, S. Jeffress Williams, Seth D. Ackerman, Steven R. Barnum, Rick T. BrennanSea-floor character and sedimentary processes of Great Round Shoal Channel, offshore Massachusetts
The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder and sidescan-sonar data collected in the vicinity of Great Round Shoal Channel, the main passage through shoals located at the eastern entrance to Nantucket Sound, Massachusetts, and from the stations occupied to verify these acoustic data (fig. 1). Basic data layers show sea-floor topography,AuthorsLawrence J. Poppe, Seth D. Ackerman, David S. Foster, Dann S. Blackwood, S. Jeffress Williams, M. S. Moser, H.F. Stewart, K.A. GlombSea-floor character and surface processes in the vicinity of Quicks Hole, Elizabeth Islands, Massachusetts
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Massachusetts Office of Coastal Zone Management (MA CZM), is producing detailed geologic maps of the coastal sea floor. The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder and sidescan sonar surveys conducted in the vicinityAuthorsLawrence J. Poppe, Seth D. Ackerman, David S. Foster, Dann S. Blackwood, Bradford Butman, M. S. Moser, H.F. StewartThe occurrence of the colonial ascidian Didemnum sp. on Georges Bank gravel habitat: ecological observations and potential effects on groundfish and scallop fisheries
The colonial ascidian Didemnum sp. is present on the Georges Bank fishing grounds in a gravel habitat where the benthic invertebrate fauna has been monitored annually since 1994. The species was not noted before 2002 when large colonies were first observed; and by 2003 and 2004 it covered large areas of the seabed at some locations. The latest survey in 2005 documented the tunicate's presence in tAuthorsP. C. Valentine, J.S. Collie, R.N. Reid, R. G. Asch, Vincent G. Guida, D.S. BlackwoodEcological observations on the colonial ascidian Didemnum sp. in a New England tide pool habitat
The colonial ascidian Didemnum sp. has colonized northwestern Atlantic coastal habitats from southern Long Island, New York, to Eastport, Maine. It is also present in offshore habitats of the Georges Bank fishing grounds. It threatens to alter fisheries habitats and shellfish aquacultures. Observations in a tide pool at Sandwich, MA from December 2003 to February 2006 show that Didemnum sp. tolerAuthorsP. C. Valentine, M.R. Carman, D.S. Blackwood, E.J. HeffronGeological Interpretation of Bathymetric and Backscatter Imagery of the Sea Floor off Eastern Cape Cod, Massachusetts
The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder data collected off Eastern Cape Cod, Massachusetts, and from the stations occupied to verify these acoustic data. The basic data layers show sea-floor topography, sun-illuminated shaded relief, and backscatter intensity; interpretive layers show the distributions of surficial sediment and sediAuthorsLarry J. Poppe, Valerie F. Paskevich, Bradford Butman, Seth D. Ackerman, William W. Danforth, Dave S. Foster, Dann S. BlackwoodProcesses influencing the transport and fate of contaminated sediments in the coastal ocean — Boston Harbor and Massachusetts Bay
No abstract available.AuthorsP. Soupy Alexander, Dann S. Blackwood, Jonathan Borden, Michael A. Casso, John Crusius, Joanne Goudreau, Linda H. Kalnejais, Paul J. Lamothe, William R. Martin, Marinna A. Martini, Sandra M. Milbert, Richard R. Rendigs, Frederick L. Sayles, Richard P. Signell, Page C. Valentine, John C. Warner - Science
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