Modellistica numerica per lo studio dei processi ecologici e per lo sviluppo di un sistema gestionale
Author(s)
Ghezzo, Michol
Date Issued
February 12, 2009
Type
Doctoral Thesis
Abstract
In the directive 2000/60/CEE (WFD) the necessity to cope and to safeguard
the water environment is strongly stressed. A rational and scienti c handling
of the resources is needed.
After a rst overview to identify the more suitable numerical tool to
be applied in the transitional and coastal environments, the chosen mod-
el has been calibrated on real cases to contribute to solve the ecosystem
management problem.
Three locations have been chosen as case studies: the rst is the Venice
Lagoon, the second is the Gulf of Cagliari and the last is the system 'Gulf
of Oristano-Cabras pool'.
In the rst location, the Venice Lagoon, the anthropogenic impact on
the ecosystem over medium time range, have been studied. Speci cally
the action of the arti cial structures built at the lagoon inlets, have been
investigated. These barriers are part of the MOSE Project.
The results of this work give information about possible local changes
of velocity and residence time, perhaps due to the new arti cial structures
at the inlets. The whole study has become part of the material collected by
the Venice Lagoon Natural Observatory.
The model has been calibrated for the Venice Lagoon to reproduce the
salinity eld. The main aim was to propose a division and classi cation of
the lagoon in areas, as asked in the directive. The comparison between mod-
elled and measured salinity elds showed a really satisfactory match. Particularly the e ects of high interannual spatial variability of the parameters
on the classi cation and typologies are shown.
The produced dataset has also been used by other research groups to
be correlated with sedimentological variables and to do a zoning based on
physiographic factors.
In the Gulf of Cagliari the hydrodynamic and water quality model has
been applied to verify the system answer to di erent managing hypothesis
for the use of coastal and waste waters. This activity stressed the response
of the system under di erent wind regimes and permitted to evaluate the
e ects on coastal water quality of the nutrient variation, in terms of quantity
and distribution.
In the Gulf of Oristano the characteristics of the transport scales have
been investigated. The e ects of possible changes in the geometry of the
interconnection channel between the gulf and the Cabras pool have been
studied to de ne the hydrological and water quality characteristics of the
pool. The results permit to identify the high risk areas where pollutant can
accumulate. Speci cally, the e ect of an higher water exchange between the
gulf and the pool on the organic matter accumulation and on sheries has
been evaluated. This information has been presented to the local authorities
as an additional help in the management of the area.
The project presented here succeeded in supplying a unique tool able to
integrate a large database for the management. It has been possible to help
the local municipalities not only to solve speci c management cases, with
comparison with measured data, but even to develop a working platform
useful for future activities.
Additional information
Dottorato di ricerca in Ecologia e gestione delle risorse biologiche
Subjects
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