"The National Park Service (NPS) manages nearly 12,000 kilometers (7,500 miles) of shorelines along oceans and the Great Lakes. In 2001, the U.S. Geological Survey (USGS), in partnership with the NPS Geologic Resources Division, began conducting hazard assessments and creating map products (fig.1) to assist the NPS in managing vulnerable coast resources. One of the most important and practical issues in coastal geology is determining the physical response of coast environments to water-level changes. Two trends may affect shorelines in the U.S. national parks: rising global sea level and falling Great Lakes water levels."
U.S. Geological Survey: http://www.usgs.gov/