Technical characteristics

• The system consists of standard modules with typical dimensions 12m x 3m x 4m (LxBxH) that are

connected together to form the final assembly.

• The connections can be parallel, longitudinal or oblique for the formation of a structure with the re-

quired dimensions and shape, depending on the geographical characteristics and the wave patterns of

the protected area and the desired absorption ratio. The typical breadths of the final absorber are 3m,

6m or 9m.

• The connectors are specially designed and constructed to allow the desired connections and to absorb

the vibrations that are the applied on the structure.

• The body of the wave absorber is a steel lattice type structure consisting of welded and bolted stan-

dard parts that are manufactured in fully industrialized conditions.

• In order to protect the structure from corrosion all steel parts are hot dip galvanized and additional

protection measures are applied to the boot-topping area.

• The buoyancy subassembly consists of a) fully submerged horizontal and partially submerged verti-

cal polyethylene floats filled with polystyrene and b) fully submerged polyethylene floats that can

filled with ballast water. The ballasting allows the control of the system’s draft and natural frequency

(in order to avoid resonance with the incoming waves) and the creation of excess buoyancy.

• The mooring system is composed of vertical mooring lines, which in conjunction with the excess

buoyancy allow the system to operate in areas with deep waters and be effective in absorbing the en-

ergy of a broad range of waves.

• The absorbing subassembly consists mainly of foil type units with horizontal and vertical slopes that

gradually deflect the incoming wave and absorb its energy, while at the same time cancel out the ex-

erted forces inside the structure.

• The deck of the wave absorbers consists of hot dip galvanized steel grating.

Mission Floating wave absorbing system for the protection of coastal and offshore installations from the sea

waves, with applications in marinas, fishing harbors, anchorages and in general port construction, for

additional protection of existing ports and for the protection of coasts from the waves and from erosion.

Technical data sheet 4.1

Floating wave absorber with vertical Model:

moorings and excess buoyancy KIMODOKI

Floating W.A. in Lavrion, Greece— Pilot installation for a research project

Offshore Energy Systems S.A.

48 Karaoli & Dimitriou Str 152 32 Halandri, Greece Tel. +30 210 6775 003 fax +30 210 6812 770

www.offshoresystems.gr tech@martech.gr

Basic use and equipment

The main use of the wave absorber is the creation of protected coastal and offshore areas. The standard

edition of the w.a. includes all necessary equipment and fittings, such as mooring system, steel grating

deck and ballasting system.

ΕΕ1.1150-06 (EN) | Α-01 | 17-02-2010

Advantages - Range of applications

The wave absorber system is a patent of our

company (Greek Industrial Property Organiza-

tion patent No. 1003786/2002) that was devel-

oped in the context of a research program par-

tially funded by the Greek Secretariat of Re-

search and Technology.

The advantages of the wave absorbers can be

summarized as follows:

• No permanent structures are required that in

general disturb the environment and the

natural flow of the water creating pollution

sources in the inner port basin.

• The system operates by absorbing the wave

energy instead of breaking or reflecting the

waves that lead to the creation of standing

waves outside the basin eventually causing

serious problems to vessels approaching the

port.

• Due to the wave absorption (instead of the

usual deflection) no erosion is developed in

nearby coasts, a phenomenon that is com-

mon in all permanent port structures.

• The floating wave absorbing system are ef-

fective against a broad range of waves,

unlikely floating breakwaters that are effec-

tive only in partially sheltered areas charac-

terized by waves with small height and peri-

ods.

• The natural frequency of the wave absorbers

can be adjusted according to the characteris-

tics of the installation area (water depth,

wave particulars) so that to avoid the reso-

nance of the system to the incoming waves.

This in conjunction with the absorbing units’

characteristics help to minimize the loads

applied to the structure and to abate the

wave induced movements of the system.

• The wave absorbers do not suffer from run-

up incidents that are common in permanent

gravity and in some floating structures,

which allow the wave energy to reach the

inner port basin causing significant prob-

lems.

Additional use and equipment

A wave absorber installation can under certain

conditions be used as a wharf as is or in combi-

nation with floating docks (type THOI).

In this case, the additional equipment includes

additional mooring lines (catenaries), bollards,

wooden deck, rubber or wooden fenders and

protective rail.

Wave absorber module

Wave absorber ready to be installed

Innovative design of a marina in Kalomos, Greece using floating wave absorbers and absorbing quays

Offshore Energy Systems S.A.

48 Karaoli & Dimitriou Str 152 32 Halandri, Greece Tel. +30 210 6775 003 fax +30 210 6812 770

www.offshoresystems.gr tech@martech.gr

Absorbing subassembly