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Coastal and Marine Geology Program > Online Science Resource Locator > Alaska

Alaska

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

These are results 1 through 14 of 14 matches.

Research Project
National Assessment of Shoreline Change Project
Description: Beach erosion is a chronic problem along most open-ocean shores of the United States. As coastal populations continue to grow, and community infrastructures are threatened by erosion, there is increased demand for accurate information regarding past and present shoreline changes. There is also need for a comprehensive analysis of shoreline movement that is regionally consistent. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is conducting an analysis of historical shoreline changes along open-ocean sandy shores of the conterminous United States and parts of Alaska and Hawaii. A primary goal of this work is to develop standardized methods for mapping and analyzing shoreline movement so that internally consistent updates can periodically be made to record shoreline erosion and accretion.
updated: 2004-07-21 pages include:

Research Project
Marine Aggregate Resources and Processes
Description: The Marine Aggregates (Sand and Gravel Assessment) Project has developed and is implementing a scientifically rigorous series of regional studies mapping the seafloor sedimentary character and assessing marine sand and gravel resources around the United States. Results of the regional assessments will ultimately comprise a national assessment of marine sand and gravel. This study is responding to increasing demand for web-accessible GIS-type data and interpreted geologic map information on the sedimentary character of the seafloor and aggregate resources suitable for beach nourishment and coastal restoration, as well as seafloor sediment texture information for benthic habitat mapping and sediment transport studies.
updated: 2004-05-07 pages include:

Publication
USGS OFR 03-411 - Preliminary Hydrodynamic Analysis of Landslide-Generated Waves in Tidal Inlet, Glacier Bay National Park, Alaska
Description: A landslide block perched on the northern wall of Tidal Inlet, Glacier Bay National Park (Figure 1), has the potential to generate large waves in Tidal Inlet and the western arm of Glacier Bay if it were to fail catastrophically. Landslide-generated waves are a particular concern for cruise ships transiting through Glacier Bay on a daily basis during the summer months. The objective of this study is to estimate the range of wave amplitudes and periods in the western arm of Glacier Bay from a catastrophic landslide in Tidal Inlet. This study draws upon preliminary findings of a field survey by Wieczorek et al. (2003), and evaluates the effects of variations in landslide source parameters on the wave characteristics.
updated: 2003-10-29 pages include:

Publication
USGS OFR 02-391 - USGS Western Region Coastal and Marine Geology, Multibeam Bathymetry and Selected Perspective Views of Main Part of Glacier Bay, Alaska
Description: Glacier Bay is a diverse fjord ecosystem with multiple tidewater glaciers and complex biological, geological, and oceanographic patterns that vary greatly along its length. The bay was completely glaciated prior to the 1700's, and subsequently experienced the fastest glacial retreat recorded in historical times (Fig. 1). As a result, some of the highest rates of glacial sedimentation and uplift are observed here. Glacier Bay is the deepest silled fjord in Alaska, with depths of over 450 meters. The variety of physical processes (for example icebergs gouging, see Fig. 2) and depths creates many diverse habitats within a relatively small area. Mapping benthic (seafloor) habitats is thus crucial to understanding and managing Glacier Bay's complex marine ecosystem and the marine species therein. High-resolution multibeam mapping of the bay, funded jointly by USGS and the National Park System, provides an unprecedented new baseline for resource and habitat assessment. Full integration of the new data set will require additional ground-truthing data (sampling) and analysis. The USGS goal is to develop integrated geological and oceanographic habitat models for the marine benthos in Glacier Bay, as a step toward determining the habitat relationships of critical species and resources within the Park. This Open-File Report publishes the multibeam bathymetry along with images.
updated: 2003-10-29 pages include:

Publication
An Overview of Coastal Land Loss: With Emphasis on the Southeastern United States
Description: In states bordering the Gulf of Mexico and the Atlantic Ocean, vast areas of coastal land have been destroyed since the mid 1800s as a result of natural processes and human activities. The physical factors that have the greatest influence on coastal land loss are reductions in sediment supply, relative sea level rise, and frequent storms, whereas the most important human activities are sediment excavation, river modification, and coastal construction. As a result of these agents and activities, coastal land loss is manifested most commonly as beach/bluff erosion and coastal submergence.
updated: 2003-08-20 pages include:

Research Project
Coastal and Marine Knowledge Bank Project
Description: USGS scientists are faced with many challenges created by the Information Revolution. One of the greatest challenges is to use and preserve data, information, and knowledge for the benefit of society. The USGS Coastal and Marine Geology Program (CMGP) meets this challenge with the development of a Coastal and Marine Knowledge Bank.
updated: 2003-07-03 pages include:

General Information
USGS Fact Sheet 130-02: Satellite Image Atlas of Glaciers of the World
Description: Satellite Image Atlas of Glaciers of the World
updated: 2002-11-09 pages include:

Research Project
Nearshore Benthic Bio-Habitats Project
Description: Geophysical characterization of the coastal sea floor to identify benthic fish and shellfish habitat. Areas include Glacier Bay, Alaska and the Channel Islands National Marine Sanctuary, National Park, and Southern California State Fish Preserves.
updated: 2001-08-14 pages include:

Data Set
Global Inventory of Natural Gas Hydrate Occurance
Description: This updated global inventory reports on natural gas hydrate recovered from 20 places worldwide and includes 79 places where the presence of gas hydrate has been inferred from geophysical, geochemical, or geological evidence.
updated: 2001-01-09 pages include:

Educational Materials
GLORIA Imagery of the Exclusive Economic Zone of the USA
Description: USGS research using GLORIA sidescan sonar to map the sea floor within the 200-mile wide Exclusive Economic Zone.
updated: 2000-07-12 pages include:

General Information
El Niño Home Page
Description: El Niño information with links to a broad range of topics such as Floods, Landslides, Coastal Hazards, Climate, News Releases.
updated: 2000-01-31 pages include:

Educational Materials
About Gas Hydrates and a USGS gas hydrate project
Description: Questions and answers about submarine gas hydrates: an ice-like crystalline solid formed of water and gas that is found in places under the sea floor and has important implications to techniques of deep-sea drilling and future energy supplies.
updated: 1999-03-08 pages include:

Data Set
Bering Sea GLORIA Imagery
Description: GLORIA sidescan sonar imagery of the Bering Sea, Alaska showing index map and downloadable quadrangles of sea-floor imagery.
updated: 1998-06-30 pages include:

Research Project
Marine Geology of Benthic Biohabitats in Glacier Bay, Alaska
Description: A project to characterize the seafloor habitats in Glacier Bay, Alaska, including geomorphic, sedimentologic, and stratigraphic descriptions, based on acoustic imaging and profiling of the fjord floor
updated: 1998-03-26 pages include:

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Coastal and Marine Geology Program > Online Science Resource Locator > Alaska