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| Titel |
FOAM, the new benthic degradation model and its calibration in Mediterranean condition: an application to a fish farm |
| VerfasserIn |
P. De Gaetano, P. Vassallo, A. Doglioli, M. Magaldi |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019435
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| Zusammenfassung |
| A new numerical benthic degradative module FOAM (Finite Organic Accumulation Module)
has been coupled with the advection-dispersion model POM-LAMP3D in order to improve
the prediction of the potential impact of marine fish farms. Moreover real historic
current-meter data are employed to force the hydrodynamic and dispersion simulations and
recent measurements of settling velocity values specifically targeting Mediterranean fish
species are considered.
FOAM uses the output of the other functional units of the modeling framework to calculate
the organic load on the seabed. It considers the natural capability of the seafloor in
absorbing part of the organic load. Different remineralization rates reflect the sediment
stress levels and are used to compute the organic carbon concentration remaining on
the seabed after degradation. Two sampling campaigns have been performed in
a typical Mediterranean fish farm in the warm and cold season in 2006 in order
to measure the benthic response to the organic load and the mineralization rates
in the Mediterranean conditions. Organic degradation for both uneaten feed and
faeces is evaluated by changing release modality (continuous and periodical) and by
varying the settling velocities. The results show that in the Mediterranean conditions,
the benthic response to the organic enrichment of the bottom depends on water
temperature.
We find that the introduced modeling framework successfully improves capability
predictions. It can therefore represent an important tool in decision making processes, for
planning and monitoring purposes. |
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