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| Titel |
Decadal trends in beach morphology on the east coast of South Africa and likely causative factors |
| VerfasserIn |
S. Corbella, D. D. Stretch |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 8 ; Nr. 12, no. 8 (2012-08-13), S.2515-2527 |
| Datensatznummer |
250011045
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| Publikation (Nr.) |
 copernicus.org/nhess-12-2515-2012.pdf |
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| Zusammenfassung |
| Sandy shorelines are dynamic with constant changes that can cause hazards in
developed areas. The causes of change may be either natural or anthropogenic.
This paper evaluates evidence for shoreline changes and their causative
factors using a case study on the east coast of South Africa. Beach
morphology trends were found to be location-specific, but overall the beaches
show a receding trend. It was hypothesized that wave, tide, sea level and
wind trends as well as anthropogenic influences are causative factors, and
their contributions to shoreline changes were evaluated. Maximum significant
wave heights, average wave direction, peak period and storm event frequencies
all show weak increasing trends, but only the increases in peak period and
wave direction are statistically significant. The chronic beach erosion
cannot be attributed to wave climate changes since they are still too small
to explain the observations. Instead, the impacts of sea level rise and
reductions in the supply of beach sediments are suggested as the main
causative factors. The analysis also identifies a trend in the frequency of
severe erosion events due to storms that coincide with a 4.5-yr extreme tide
cycle, which demonstrates the potential impact of future sea level rise. |
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