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Floating Wave Absorbers of Intense Floatation

Antonis Daskalakis
Antonis Daskalakis

Wave absorbing systems as opposed to wave breaking. A short presentation of an innovative system to absorb wave energy, to protect coasts from erosion to create ports and other protected sea areas

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Technical data sheet 4.1 Floating wave absorber with vertical Model: moorings and excess buoyancy KIMODOKI Offshore Energy Mission Systems S.A. 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 48 Karaoli & Dimitriou Str additional protection of existing ports and for the protection of coasts from the waves and from erosion. 152 32 Halandri, Greece Tel. +30 210 6775 003 fax +30 210 6812 770 www.offshoresystems.gr tech@martech.gr Floating W.A. in Lavrion, Greece Pilot installation for a research project 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 systems 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.
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. Offshore Energy Advantages - Range of applications Systems S.A. The wave absorber system is a patent of our 48 Karaoli & Dimitriou Str company (Greek Industrial Property Organiza- 152 32 Halandri, Greece tion patent No. 1003786/2002) that was devel- Tel. +30 210 6775 003 oped in the context of a research program par- fax +30 210 6812 770 www.offshoresystems.gr tially funded by the Greek Secretariat of Re- tech@martech.gr 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 Wave absorber module sources in the inner port basin. Wave absorber ready to be installed 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 Innovative design of a marina in Kalomos, Greece using floating wave wave induced movements of the system. absorbers and absorbing quays 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, Absorbing subassembly wooden deck, rubber or wooden fenders and protective rail. 1.1150-06 (EN) | -01 | 17-02-2010

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Floating Wave Absorbers of Intense Floatation

  • 1. Technical data sheet 4.1 Floating wave absorber with vertical Model: moorings and excess buoyancy KIMODOKI Offshore Energy Mission Systems S.A. 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 48 Karaoli & Dimitriou Str additional protection of existing ports and for the protection of coasts from the waves and from erosion. 152 32 Halandri, Greece Tel. +30 210 6775 003 fax +30 210 6812 770 www.offshoresystems.gr tech@martech.gr Floating W.A. in Lavrion, Greece Pilot installation for a research project 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 systems 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.
  • 2. 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. Offshore Energy Advantages - Range of applications Systems S.A. The wave absorber system is a patent of our 48 Karaoli & Dimitriou Str company (Greek Industrial Property Organiza- 152 32 Halandri, Greece tion patent No. 1003786/2002) that was devel- Tel. +30 210 6775 003 oped in the context of a research program par- fax +30 210 6812 770 www.offshoresystems.gr tially funded by the Greek Secretariat of Re- tech@martech.gr 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 Wave absorber module sources in the inner port basin. Wave absorber ready to be installed 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 Innovative design of a marina in Kalomos, Greece using floating wave wave induced movements of the system. absorbers and absorbing quays 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, Absorbing subassembly wooden deck, rubber or wooden fenders and protective rail. 1.1150-06 (EN) | -01 | 17-02-2010