Τίτλος:
Assessment of the physical impact of a short-term dredging operation on
a semi-enclosed environment: South Euboean Gulf, Greece
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
The potential influence of short-period (May-June 2012) dredging
activities (for the installation of a submarine gas pipeline) on
physical properties of the marine environment of two shallow-water sites
in the Aliveri and Varnavas areas of South Euboean Gulf (Greece) has
been evaluated. During the dredging operation in Varnavas, the induced
dredge plume traveled up to 750 m from the shoreline, featured by light
attenuation coefficient (c(p)) maxima of 4.01-4.61 m(-1) and suspended
particulate matter (SPM) concentrations up to 6.01 mg L-1. After
dredging the previous parameters reduced to the ambient seawater
condition, 0.45 m(-1) and < 2.8 mg L-1 on average, respectively.
Likewise in Aliveri, the dredging-associated sediment plume drifted
offshore up to 400 m from the shoreline, characterized by c(p) maxima of
2.11-4.86 m(-1) and SPM concentrations up to 13.07 mg L-1. After the
completion of the excavation and trenching activities, the c(p) and SPM
values were restored to the pre-disturbance condition, 0.6 m(-1) and <
2.2 mg L-1 on average, respectively. The migration of the dredge plume
in both dredging sites was accomplished through the formation of
intermediate and benthic nepheloid layers, whose development and
evolution were governed by seawater stratification and flow regime. The
dredging-derived SPM levels appeared to increase within a distance of no
more than 300 m from the shoreline (near-field zone). Based on data from
the literature, this SPM enhancement together with the deposition of a
post-dredging residual mud veneer in the near-field zone could
deteriorate local marine biota, but in a reversible way.
Συγγραφείς:
Kanellopoulos, Theodore D.
Panagiotopoulos, Ioannis P. and
Karageorgis, Aristomenis P.
Kikaki, Aikaterini
Morfis, Ioannis
and Hatiris, Georgios-Angelos
Vandarakis, Dimitris
Rousakis,
Grigoris
Kapsimalis, Vasilios
Περιοδικό:
Environmental Monitoring and Assessment
Λέξεις-κλειδιά:
Submarine pipeline trenching; Dredge plume; Environmental monitoring;
Suspended particulate matter; Light attenuation coefficient
DOI:
10.1007/s10661-019-7998-7
