期刊
EARTH SURFACE PROCESSES AND LANDFORMS
卷 40, 期 5, 页码 569-585出版社
WILEY-BLACKWELL
DOI: 10.1002/esp.3650
关键词
shoreline change; cuspate coastlines; wave climate; coastline shape; human impacts on coastlines
资金
- Geomorphology and Land Use Dynamics Program of the National Science Foundation [EAR 1053141]
- Martin Fund in Geological Sciences at the University of North Carolina Chapel Hill
- Directorate For Geosciences
- Division Of Earth Sciences [1053151] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1053106, 1053033] Funding Source: National Science Foundation
Since cuspate coastlines are especially sensitive to changes in wave climate, they serve as potential indicators of initial responses to changing wave conditions. Previous work demonstrates that Cape Hatteras and Cape Lookout, North Carolina, which are largely unaffected by shoreline stabilization efforts, have become increasingly asymmetric over the past 30years, consistent with model predictions for coastline response to increases in Atlantic Ocean summer wave heights and resulting changes in the distribution of wave-approach angles. Historic and recent shoreline change observations for Cape Fear, North Carolina, and model simulations of coastline response to an increasingly asymmetric wave climate in the presence of beach nourishment, produce comparable differences in shoreline change rates in response to changes in wave climate. Results suggest that the effect of beach nourishment is to compensate for - and therefore to mask - natural responses to wave climate change that might otherwise be discernible in patterns of shoreline change alone. Therefore, this case study suggests that the effects of wave climate change on human-modified coastlines may be detectable in the spatial and temporal patterns of shoreline stabilization activities. Similar analyses of cuspate features in areas where the change in wave climate is less pronounced (i.e. Fishing Point, Maryland/Virginia) and where local geology appears to exert control on coastline shape (i.e.Cape Canaveral, Florida), suggest that changes in shoreline configuration that may be arising from shifting wave climate are currently limited to sandy wave-dominated coastlines where the change in wave climate has been most pronounced. However, if hurricane-generated wave heights continue to increase, large-scale shifts in patterns of erosion and accretion will likely extend beyond sensitive cuspate features as the larger-scale coastline shape comes into equilibrium with changing wave conditions. Copyright (c) 2014 John Wiley & Sons, Ltd.
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