Breakwater Design


#298

Quite a charming way of introducing yourself.

I do tend to fire back, but I did not set loose the first volley.

Since initial insults have been exchanged, welcome to the pool. Jump in. Water ranges from Polar to sub-sea-thermal-vent. Plenty of room and variation for all.

This is the Ramform Titan:

Gross Tonnage: 20637
Deadweight: 7351 t
Length Overall x Breadth Extreme: 104.2m × 70.02m
Year Built: 2013
Status: Active

Read more at http://www.marinetraffic.com/en/ais/details/ships/shipid:372038/mmsi:311000084/imo:9629885/vessel:RAMFORM_TITAN#Wrwb28VBCRhF2XCr.99

Largest Ramform, so far, with a larger version supposedly under construction.

The configuration and its extent affords PGS considerable survey flexibility, faster deployment and recovery of the recording gear, and enhanced overall efficiency, with the requisite operational safety. She will typically tow more than 12km² of equipment, encompassing several hundred thousand advanced recording sensors encased in 16 or more cables, each up to 10km in length, suspended 10m-20m below the surface. By installing a 24-reel outfit, the owner has ensured a very high level of operational redundancy as well as increased potential for the future.

The lateral offset of the streamers is achieved by deflectors. Ramform Titan applies the successful deflector handling arrangement used on the preceding S-class.

The sinusoidal waterline makes for stable motion behaviour across the beam, with the proportionally vast back deck ideally suited to the installation, deployment, retrieval and towing of the extensive seismic gear and related equipment, and affording substantial, interior instrument room capacity.

http://www.motorship.com/news101/ships-and-shipyards/latest-ramform-pushes-the-bounds-in-seismic-vessel-technology


#299

This comment thread is about “breakwater design”.

Your affection for the Ramform Titan boat is noted. I hope it works well for your project in GoMex, @JL_Frusha.


(Matias Volco) #300

The sinusoidal waterlline, like the bulbous bow, are streamlined for speed and particular specs . The 100L by 70B proportio is what matters about Seismic ships. Other examples of the ramform principle include wide regatta sailboats, the protected aft area where a dhingy’s propeller is most efficient, havfarm, and Prelude.

the ramform principle relates to breakwater because it allows a gradual bridge between a single relativ. modest project and the imagined large macroeconomic round breakwater.


#301

There ARE no other examples, that meet the patents. PGS has ALL of the Ramform vessels. Some happen to be stored for future use, they might be available, if the price was right.

CLOSEST thing is art from various yacht designs, which also conform to the patent descriptions.


#302

… and back to breakwater…

Using a Ramform hull to smooth the water, downstream. for smooth water-flow for streamers to grow kelp, is an ideal moored concept, for a smaller, family scale seastead/Gulfstead, to raise food foe pens of fish, Abalone, etc.


(Matias Volco) #303

indeed a ramform base could work along with drifting spheres to mange a small or large scale aquaculture operation


(Matias Volco) #304

the movement would be around the mooring axis, very close to the bow


#305

So far, the only Ramform converted and on a turret mooring, has that turret amidships, roughly 1/2 the length back from the bow.


#306

Yes, agreed. Thanks.

My original post was reflecting upon a situation in which neither the SWORD nor the Floating City was tethered.

If the SWORD was not tethered, it would drift back into the Floating City. In that case, separation of the two would require continuous maintenance.

The use of tethering is a trade-off. With the tether, there is loss of full mobility and the problems related to the tethering line.

Without the tether, there is a different rate of drift between the SWORD and the Floating City that requires management. Plus, geopositioning would have to be maintained.


(Matias Volco) #307

All of that can be a plus or a challenge depending on context and scale. Stationary is default and easily solved with a turret anchor so that the entire structure rotates in the same fashion as a small sailboat on a buoy, or the Natural Gas “shipstead” Prelude out in the Typhoon-affected Indian Ocean.

Ramforms can still be easily and slowly towable, but, drifting or orbiting has been discussed more in relation to underwater objects instead, which can hatch into currents at snorkel depth.


(Larry G) opened #309

(Larry G) #310

Picture a floating breakwater design. It is not intended for occupation. It would be a pure breakwater, potentially it could have a dual purposes for freshwater storage, but this would be somewhat complex.

It is massive, and therefore expensive. It is not very mobile. It is turret-moored, in a sense. Rather than the turret rotating around a vertical access, it has dual turrets, one on each end with a horizontal axis. This limits the number of catenary anchor lines possible, perhaps to three on each turret. The massive body of the breakwater is allowed to “roll” in response to swells, which makes it dissipate some of the energy. It absorbs some and dissipates it through gravity/displacement heaving. The varying angles of the multiple faces of the breakwater both engage the swells more fully and cause the swell to break across the length at different times. Although pictured as a star-shaped cylinder here, it could be a spiral, or have a number of different armatures of various length and internal buoyancy, as complex as is financially feasible.


#311

So the usual “bow” design isn’t necessary for this … only energy refraction and dissipation?

How would this design stay pointed into the oncoming waves?


(Larry G) #312

I imagine multiple sections surrounding a protected installation. It’s possibly moored in tension rather than turret moored with catenary lines.


(Larry G) #313

http://www.maritime-executive.com/article/modular-breakwater-harnesses-wave-power?


#314

Maybe reduce it to 3 flapper doors, rather than multiple small ones, for a more robust design? Just my opinion. Can’t see having so many moving parts and not being fragile.


#315

This could also be adapted for the bottom system I believe will work to create an open-top ‘lagoon’ like the water above a Japanese Pufferfish ‘mandala’


(Ali) #316

I have never heard about such kind of breakwater, seems great idea but for deep water, it will be difficult to supply enough strong air bubbles. If you can do this again difficult to reach to sea surface, because of tide, wave etc.

Regards
Ali


#317

http://physicsworld.com/cws/article/news/2008/oct/02/invisibility-cloak-for-water-waves

To me, it has similar appearance and properties of the Japanese Pufferfish ‘mandala’ nest… (and other species do, similarly), controlling the water flow inside the nests for fresh, aerated, but regulated flow as well. Certain parasites have teeth in a similar arrangement for stable attachment and the collection of oxygenated fluids, as well.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5384288/


#318

A Professor at U of NH is going to contact colleagues at UT and TX A&M Corpus Christi with my concept regarding the Pufferfish nests as a starting point.