e@ Wave period, height and direction 
e Stiffness and geometry of moorings 
@ Mass of the vessel 
@ Water Depth 
e Draft of the vessel (in shallow water) 
The floating pier should be operable in sea state 4 and be capable 
of survival in sea state 6. The characteristics of sea states are de- 
fined as follows: 
SEA STATE a Z 3) 4 5 6 
Wind Velocity (kts) 7 10 16 18 23 30 
Wave Height * (ft) I Ges BG 4-8 6-13 23 
Wave Period (sec) §- ied, 23.8 9 255RI0 StI! Ge/elGe7/ 
Period of Maximum 
Energy (sec) 4.0 6.0 Vol 8.9 eS 
*Average of the highest 1/3 of the waves 
For a facility used to offload large cargo vessels, consideration 
must be given to the effect of long period waves. The facility should 
be capable of operation in the following conditions: 
Wavelength (ft) 1,300 1,000 
Wave Period (sec) 16 14 
Wave Height (ft) 3 5 
The short period sea generated by a local storm can produce waves 
which are disruptive to small boat or even small ship operations but 
which do not effect cargo operations. Long period swells produced by 
distant storms can have a profound effect on both the floating pier and 
the large cargo ships that are berthed at the pier. These swells may 
produce extremely large mooring forces and excessive ship motions. 
2.2.7 Ice. Consideration must be given to the possibility of pier 
use in areas where severe ice loads occur. Ice control may be performed 
by icebreaking, ice suppression, prevention of ice formation or ice di- 
version. Load calculation must include static and dynamic ice loading. 
D-5 
