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ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE: 14
Figure 13: Seasonal and annual frequencies of wind force classes (5). The wind force is given
in Beaufort.
Conclusion
For this statement, the most interesting winds are the strongest winds, which
may cause problems related to the port facilities’ operational functions. Most
sensitive are the mobile portal crane (100 tons) and the container bridge, for
which the operational criterion comes to the wind peak of 5 Bf (36 km/h or 10
m/s). The data show that such winds (= 6 Bf), making the loading activities
impossible, blow ca 30 days or 8,2% per year.
All the equipment should be dimensioned for at least two-second gusts of ca
11 Bf (108 km/h or 30 m/s), which are possible by a long-term distribution if
the maximum hourly wind speed comes to 8/9 Bf (72 km/h or 20 m/s).
According to the observed periods, the maximum speed of 8/9 Bf (20 m/s) can
be understood as the speed of the return period of 20 years. For a 100-year
return period, according to the Gumbel distribution scale, the maximum speed
will amount to ca. 23 m/s, which corresponds to 9/10 Bf.
Theoretically speaking, the winds that may generate surface waves, which
may impact the site, blow from the south-southwest. Based on the
aforementioned data, they can be 5/6 Bf (10 m/s) strong in a twenty-year
return period, i.e. a limit of 6/7 Bf (14 m/s) is accepted as the speed per hour.
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