Il sistema di raffreddamento di una centrale termoelettrica del litorale laziale: impatto sugli stadi precoci dei teleostei
Author(s)
Matiddi, Marco
Date Issued
March 21, 2012
Type
Doctoral Thesis
Abstract
Due to the large amount of natural water used in the cooling intake of electric power plants,
resulting impact on marine organisms have been studied in different part of the world.
Cooling water intake usually affect marine organisms in three different way: entrainment (where
small aquatic organisms are carried by the cooling water into the power plant), impingement (where
the cooling water intake traps larger organisms against the intake screens) and thermal outfall (hot
water discharged on living organisms in the receiving water body).
In this study (the first one carried out in Italy), the impact of the cooling water intake of the electric
power plant of Montalto di Castro (VT) (Central Tyrrhenian Sea) on fish was determined by
evaluating the effect of entrainment on eggs and larvae and that of thermal outfall on juveniles.
A specific sampling design has been create to operate inside the artificial intake, with new
methodology, different plankton nets and right time of haul.
Sampling campaign have been conduct at sea, using a handed trawling net, to the catch of juveniles
fish during settlement stage, in the thermal outfall area and in two control areas.
Overall 668 fish larvae of 24 taxa and 2500 fish eggs were collected after filtering 235.574 m3
of marine water inside the intake.
Impact of entrainment on early stage of fish was estimated to be of 12 x 106 larvae and 24,5 x 106
eggs per year.
Sardina pilchardus was the most impacted species, with an estimated economic damage to the
traditional fisheries, ranging between 9.000 and 15.000 euro per year.
The highest values of diversity index, richness and evenness were recorded in summer, whereas
the largest number of larvae were caught during winter.
Additional information
Dottorato di ricerca in Ecologia e gestione delle risorse biologiche
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