GEOSCAN Search Results: Fastlink

GEOSCAN Menu


TitleMapping of the major morphologic features and seafloor sediments of the New Hampshire Continental Shelf using the Coastal and Marine Ecologic Classification Standard (CMECS)
DownloadDownload (whole publication)
AuthorWard, L; McAvoy, Z; Nagel, E
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; by Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Geological Survey of Canada, Open File 8295, 2017 p. 119, https://doi.org/10.4095/305940 (Open Access)
LinksGeoHab 2017
Year2017
PublisherNatural Resources Canada
Meeting2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Geological Survey of Canada, Open File 8295
File formatpdf
AreaNew Hampshire; United States
Lat/Long WENS -71.0000 -67.0000 44.0000 42.0000
Subjectsmarine geology; surficial geology/geomorphology; environmental geology; geophysics; mapping techniques; oceanography; marine environments; coastal studies; conservation; marine organisms; marine ecology; resource management; biological communities; environmental studies; ecosystems; continental margins; continental shelf; seafloor topography; bedforms; bathymetry; erosion; grain size distribution; marine sediments; gravels; muds; sands; glacial deposits; glacial landforms; glaciomarine deposits; drumlins; lag deposits; shoals; geophysical surveys; acoustic surveys, marine; sonar surveys; side-scan sonar; seismic data; core samples; software; geological mapping; geological mapping techniques; biology; habitat mapping; habitat conservation; habitat management; geographic information systems applications
ProgramOcean Management Geoscience, Offshore Geoscience
Released2017 09 26
AbstractThe New Hampshire continental shelf is extremely heterogeneous and includes extensive bedrock outcrops, sand and gravel deposits, and muddy basins. Many of the depositional features are glacial in origin and have been significantly modified by marine processes as sea level fluctuated since the end of the last major glaciation. Glacial deposits (e.g., drumlins) on the shelf have been eroded, leaving very coarse lag deposits, while supplying sand to develop wave-formed features (shoals). Many of these features have positive relief standing above the seafloor, lending evidence of their formation by waves and shallow water currents. Some of these deposits may represent significant sand and gravel deposits and have the potential for future use for beach nourishment and other efforts to build coastal resiliency.
Relatively recent high resolution multibeam echosounder (MBES) bathymetric and backscatter surveys have revealed features of the New Hampshire shelf and vicinity seafloor in exceptional detail that has not been previously described. Synthesis of the MBES bathymetry and backscatter (along with bathymetric derivatives), coupled with an extensive archived database consisting of subbottom seismics, bottom sediment grain size data, and vibracores, were used to develop new surficial geology maps based on CMECS (partially supported by the Bureau of Ocean Energy Management). The new surficial geology maps of the New Hampshire shelf produced in ArcGIS represent a major improvement over previous mapping efforts and provide ground truth for testing automated classification approaches. Presently, the CMECS maps are being refined and the classification of the geoforms expanded for paraglacial environments. In addition, automated characterization and segmentation approaches using QPS Fledermaus Geocoder Toolbox Angle Range Analysis (ARA) and ESRI ArcGIS Spatial Analyst Tools are being evaluated.
GEOSCAN ID305940