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| Titel |
Emergent behavior in a coupled economic and coastline model for beach nourishment |
| VerfasserIn |
E. D. Lazarus, D. E. McNamara, M. D. Smith, S. Gopalakrishnan, A. B. Murray |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 18, no. 6 ; Nr. 18, no. 6 (2011-12-15), S.989-999 |
| Datensatznummer |
250014011
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| Publikation (Nr.) |
 copernicus.org/npg-18-989-2011.pdf |
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| Zusammenfassung |
| Developed coastal areas often exhibit a strong systemic
coupling between shoreline dynamics and economic dynamics. "Beach
nourishment", a common erosion-control practice, involves mechanically
depositing sediment from outside the local littoral system onto an actively
eroding shoreline to alter shoreline morphology. Natural sediment-transport
processes quickly rework the newly engineered beach, causing further changes
to the shoreline that in turn affect subsequent beach-nourishment decisions.
To the limited extent that this landscape/economic coupling has been
considered, evidence suggests that towns tend to employ spatially myopic
economic strategies under which individual towns make isolated decisions
that do not account for their neighbors. What happens when an optimization
strategy that explicitly ignores spatial interactions is incorporated into a
physical model that is spatially dynamic? The long-term attractor that
develops for the coupled system (the state and behavior to which the system
evolves over time) is unclear. We link an economic model, in which
town-manager agents choose economically optimal beach-nourishment intervals
according to past observations of their immediate shoreline, to a simplified
coastal-dynamics model that includes alongshore sediment transport and
background erosion (e.g. from sea-level rise). Simulations suggest that
feedbacks between these human and natural coastal processes can
generate
emergent behaviors. When alongshore sediment transport and spatially myopic
nourishment decisions are coupled, increases in the rate of sea-level rise
can destabilize economically optimal nourishment practices into a regime
characterized by the emergence of chaotic shoreline evolution. |
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