Relative coastal change-potential assessment of Kenai Fjords National Park
Pendleton EE, Thieler R, Williams SJ, US Geological Survey. 2006. Relative coastal change-potential assessment of Kenai Fjords National Park. U.S. Geological Survey (USGS) Open-File Report. 2004-1373. U.S. Geological Survey. Reston, Virginia
A change-potential index (CPI) was used to map the relative coastal change-potential of the shoreline to future sea-level changes within Kenai Fjords National Park (KEFJ) in south-central Alaska. The CPI ranks the following parameters in terms of their physical contribution to coastal change: geomorphology, regional coastal slop, rate of relative sea-level change, historical shoreline change rates, mean tidal range, and mean significant wave height. The rankings for each input variable were combined, and an index value was calculated for 1-minute grid cells covering the park. The CPI highlights those regions where the physical effects of sea-level and coastal changes might be the greatest. This multi-parametric approach combines the coastal systems potential for change with its natural ability to adapt to changing environmental conditions, yielding a quantitative, although relative, measure of the park’s natural susceptibility to the effects of sea-level variation. The CPI provides an objective technique for evaluation and long-term planning by scientists and park managers. The CPI was developed from a Coastal Vulnerability Index (CVI) typically applied to coastlines undergoing long-term sea-level rise. The CPI is modified from the CVI and applied to the emergent coast of Kenai Fjords National Park to understand the limits of applying this type of assessment method in a variety of sea-level settings. Kenai Fjords National Park consists of sand and gravel beaches, rock cliffs, calving tidewater glaciers, mudflats and alluvial fans. The areas within Kenai Fjords National Park that are likely to be most susceptible to coastal change as a result of sea-level change are tidewater glaciers and outer coast shorelines of unconsolidated sediment where shoreline erosion potential is high and wave energy is high.
- Type
- Published Report
- Authors
- Pendleton, Elizabeth; Thieler, Robert; Williams, S; US Geological Survey
- Date of Issue
- 2006
- Publisher
- U.S. Geological Survey
- Units
- KEFJ , SWAN
- Keywords
- Assessment, change-potential index, coastal change, Geomorphology, Kenai Fjords, Shoreline