Global sea level has always fluctuated depending on the climate. When the
climate cools, more ice accumulates at the Earth's poles and sea level
drops. When that ice melts, sea level rises. These changes are identifiable in the rock record and ice layers. CMG research aims to understand this cycle and its effects on the marine and coastal environments.Other related USGS websites: Global Change Research Program
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:
Description: The National Assessment of Coastal Change Hazards is a multi-year undertaking to identify and quantify the vulnerability of U.S. shorelines to coastal change hazards such as the effects of severe storms, sea-level rise, and shoreline erosion and retreat. It will continue to improve our understanding of processes that control these hazards, and will allow researchers to determine the probability of coastal change locally, regionally, and nationally. The Assessment will deliver these data and assessment findings about coastal vulnerability to coastal managers, other researchers, and the general public. updated: 2004-06-10 pages include:
Description: El Niņo information with links to a broad range of topics such as Floods, Landslides, Coastal Hazards, Climate, News Releases. updated: 2000-01-31 pages include:
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U. S. Department of the Interior | U.S. Geological Survey
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