HEADING PAGE - port of ploce authority * welcome

ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE: 26
Direction Wind speed
m/s
Windward
side
F (km)
Significant
wave height
H1/3(m)
RIJEKAPROJEKT d.o.o.
Period
T(s)
Length
L(m)
S 10.00 8.5 1.60 3.5 19.1
SW 17.00 9.0 1.40 3.4 18.0
This shows that these deepwater waves start their transformation because of the impact of
the bed at a depth of about 9 m, i.e. in front of cape Višnjica, at the entrance to the waterway.
Since the waterway has about 150m in width and 15m in depth, with about 700m in length,
and in the SSW direction, according to presented bathymetry, all waves are outside this
direction, and from the critical sector with refraction and diffraction on the shore and in
shallow waters around the way they dissipate and cannot in any way reach the port basin of
the quay 7, which means that they cannot affect its safety.
Waves from the direction SSW itself, and along the channel whose wave height can by
interpolation be determined as Hs = 1.5 m, especially behind the cape G.Višnjica, have
smaller height because of lateral energy dissipation by sudden refraction and diffraction. It
can be seen and established that the reduction of wave height only considering the principle
of energy preservation equation in diverging channel in the ratio
B1
H2 = -------- . H1
√ B2
where H1 and B1 is the height of waves and width of wave front before wave deformation and
H2 and B2 on some position in the direction of the wave beam/ ray.
In this way in the line of Quay 7 and the island of Gubavac we come to the reduction of wave
height from Hs = 1.5 m to Hs = 1.0 m. In that line there comes the diffraction of this wave and
the diffraction lines, based on the standard diagram, are the diffractions around an acute
angle shown in enclosed layout. From this analysis, it can be seen in the first approximation
that the aquatorium of Quay 7 and the berth itself are well protected from all waves from the
critical sector S - SW.
Direct waves are possible from the direction W and they can be caused by maximum wind up
to 6 Bf (about 14 m/s). With regard to the windward side which is short and amounts to about
0.9 km at the end of the basin, according to mentioned diagram Groen-Dorrenstein we get
considerable height of waves Hs = 0.4 m which has no effect on port operational level since it
lies within the permitted criteria (6), (7).
This analysis shows that the Quay 7 itself, for which the Environmental impact study is being
prepared, is very well protected from wind waves and its complete safety and operational
level with regard to this parameter.
A.3.4.1.3. Climatic data
In order to get a more complete insight into other climatic parameters on an immediate and
wider project area, here are given measured data for the weather station Ploèe for the period