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ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE: 49
A.3.4.3. GEOTECHNICAL EVALUATION OF THE LOCATION
A.3.4.3.1. ENGINEERING – GEOLOGICAL BASIS
The main rock on the processed area is made by the sedimentary rock of
karst type of Jurrasic and Cretaceous age. Due to the emphasized tangential
movements during the paleogenetic and tectonic period, there has come to
compression of rock masses. The consequence of these movements was
folding of Cretaceous and palogenetic rocks and creation of reverse structures
and covers. After the change of direction of regional stress in the younger,
neotectonic period, the earlier created structures were distrubed. The rock
mass was completely deformed and weathered, and karstificated for tens of
meters below the present sea level.
The main rock on the Ploce Port area is completely covered in the alluvium
from the delta of the Neretva river and in marine sediments as well as in
embankment. The sediments of the Neretva river delta were sedimented on
the paleorelief, formed in karst rocks, which are visible on the surface of the
surrounding elevations. According to the data known so far, the thickness of
the layer (alluvium and marine sediments) is increasing towards the south and
sout-west. On the location of the port, the thickness of alluvium from upper
pleistocenic and holocenic age above the main rock ranges from 70 to 125 m.
Alluvium of the Neretva river delta is sedimented in pronounced
morphodynamic conditions where, besides the river flow, the late pleistocenic
and holocenic erection of the Adriatc sea level had a significant influence.
Since the sedimentation environments rapidly changed as well, whether
horizontally or vertically, the sediments are of various grain size content.
Some belong to the marine, some to brackish, and the third to the fresh water
type. There is also a pronounced vertical and horizontal exchange of grain
size content, so drilling revealed sediments of sand and dust, organic mud,
clay and gravel.
Current state of relief on land and sea bed is a consequence of erection of the
Adriatic sea level, alluvium from the river Neretva delta during the upper
pleistocene and holocene, as well as embankment of the sea bed during the
construction of the port.
A.3.4.3.2. HIDROGEOLOGICAL INFORMATION
The river Neretva delta area is under the influence of the river Neretva flow as
well as of sea tides. The same is applicable to the underground water level
within the sediment body of the delta. In the port area three levels of
underground waters were established. The first or the upper level is found in
surface sands. The channel flow is open, i.e. it is the freatic type of aquifer.
The second and third channel flow, located lower, are found in gravel lenses.
The lowest gravel level is connected with deep karst water-carrier.
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