Campo idrodinamico nella Salina di Tarquinia a supporto di studi ecologici e di soluzioni operative: applicazione di un modello numerico ad elementi finiti
Author(s)
Di Maio, Antonia
Date Issued
March 7, 2008
Type
Doctoral Thesis
Abstract
The Tarquinia Salt pan is a protected paralic environment since 1980; in particular it is
designated as Site of Community Interest (SIC area) and as Special Protection Zone (ZPS
area).
The finalities of the management of the aquatic environment in the Tarquinia salt pan
therefore are changed throughout the years: in the past it was important to obtain an high
salinity in the basin and the subsequent deposition of the salt; to the contrary actually, in
order to preserve the ecological value of the salt pan, it is necessary to maintain in the basin
a constant and not excessively high salinity value.
For a long time the management of the Tarquinia salt pan has been guaranteed by
technicians who have deepened their knowledge of the system; such experience represents a
meaningful and important cultural inheritance but actually it is not sufficient and had to be
supported, more and more throughout the years to come, with objective and possibly
standardized instruments.
In general it is important to understand and to analyze the water circulation, that distributes
energy and matter inside the basin and then it has a fundamental effect on the ecosystems
conservation.
The objectives of the present work are either to test the applicability of a hydrodynamic
model to an extreme environment and to study the relationship between hydrodynamic and
confinement that is a very important ecological parameter because it is correlated to
communities organization.
A mathematical model able to describe the confinement according to hydrodynamic
circulation can be an useful standard instrument to manage not only the Tarquinia salt pan
but also all the paralic environment.
This is a strongly innovative approach either because in the past mathematical models have
not been utilized to simulate the slow circulation of salt pan and because till now the
confinement has been calculated just by means of biological indexes.
Really, other researchers have utilized numerical models to study the lagoons circulation but
the physical characteristics of the environment were not extreme as the salt pan ones; this
means that the value of the hydrodynamic field was not excessively low and however it was
more easily reproducible with mathematical models.
About the calculation of the confinement using the hydrodynamic field, the first approach
dates from 2006 (Frenod and Goubert) but the model proposed by them is too theoretical and
it is not applicable to Tarquinia salt pan, even if it gives important directions for future
developments.
In brief therefore the desidered objective of this work is to propose a new methodology to
study paralic environments, with particular attention to the confinement; the results show that
the direction is right but they open a new research field actually unknown.
Additional information
Dottorato di ricerca in Ecologia e gestione delle risorse biologiche
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