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| Titel |
Evaluation of oil spill hazard and risk for the shorelines of a mediterranean coastal archipelago |
| VerfasserIn |
Antonio Olita, Andrea Cucco, Barbara Sorgente, Simone Simeone, Leopoldo Fazioli, Alberto Ribotti, Roberto Sorgente |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250047322
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| Zusammenfassung |
| A combined deterministic/probabilistic method for evaluating the hazard of oil
slicks contact with the shores of the Archipelago of La Maddalena (north Sardinia,
Western Mediterranean) has been developed and applied. The core of the method is
a coastal 3D finite elements modeling system, able to simulate hydrodynamics
and waves of the strait of Bonifacio and, by means of a lagrangian module, the
physical/chemical fate of the oil. During a 2-years long experiment, the model, forced with
atmospheric analyses, simulates the hydrodynamics and releases continously oil particles
along the main naval pathways of the area, accordingly to nautical traffic data,
simulating their physical/chemical evolution and beaching. The oil spill module is
initialized (oil quantity, type, location) on the basis of the analysis of the Vessel
Traffic System (VTS) data. The Oil Spill Hazard Index (OSHI) is given by the total
quantity of landed oil, for each predefined coastal cell (300 X 300 m), normalized on
the released oil. An hazard index between 0 and 1, which estimates the relative
probability of oil contact with the shores, has been so obtained and mapped by
using GIS tools. Areas and periods subject to the largest hazard have been therefore
defined: this represents an important information for the management of oil slick
emergencies. Such a hazard index can be easily combined, by means of GIS tools, with
quali-quantitative parameters of vulnerability in order to estimate the risk, which is
given by hazard * vulnerability. Finally, a practical example of risk mapping and
evaluation, which takes into account the beaches granulometry, is here provided. |
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