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| Titel |
Sea-level rise induced amplification of coastal protection design heights |
| VerfasserIn |
Arne Arns, Sönke Dangendorf, Jürgen Jensen, Jens Bender, Stefan Talke, Charitha Pattiaratchi |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250143469
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| Publikation (Nr.) |
 EGU/EGU2017-7190.pdf |
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| Zusammenfassung |
| Coastal protection design heights typically consider the superimposed effects of tides, surges, waves, and relative sea-level rise (SLR), neglecting non-linear feedbacks between these forcing factors. Here, we use hydrodynamic modelling and multivariate statistics to show that shallow coastal areas are extremely sensitive to changing non-linear interactions between individual components caused by SLR. As sea-level increases, the depth-limitation of waves relaxes, resulting in waves with larger periods, greater amplitudes, and higher run-up; moreover, depth and frictional changes affect tide, surge, and wave characteristics, altering the relative importance of other risk factors. Consequently, sea-level driven changes in wave characteristics, and to a lesser extent, tides, amplify the resulting design heights by an average of 48–56%, relative to design changes caused by SLR alone. Since many of the world’s most vulnerable coastlines are impacted by depth-limited waves, our results suggest that the overall influence of SLR may be greatly underestimated in many regions.
Reference:
Arns, A.; Dangendorf, S., Jensen, J., Talke, S., Bender, J., Pattiaratchi, C.: Sea-level rise induced amplification of coastal protection design heights. Sci. Rep. 6, 40171; doi: 10.1038/srep40171 (2016). |
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