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Articles published in 2008

Mooring Barge For Charter

Mooring Barge - 91 x 27m - FOR CHARTER (id 217)

General Information
ID 217
Listing type for charter
Location Mid East/Persian Gulf
Class Germanischer Lloyd
Vessel/Barge Type Mooring Barge
Year Built 2004

Dimensions
Loa 91,44 meters
Width 27,43 meters
Depth 6,10 meters
Draught 1,10 meters
Tonnage 4179 GRT / 1254 NRT

Capacities
sewage plant (15 persons 0,9 m3/day), fuel oil : 218 m3, fresh water : 138 m3, grey water : 24 m3, dirty oil : 29 m3

Accommodations
fully airconditioned mess-/dayroom for 12 persons, sanitary facilities and 2 offices

Deck Equipment
8 deck winches

Documentation
GA_imc_id217.pdf

Halocline Effect

In oceanography, a halocline is a strong, vertical salinity gradient. Because salinity (in concert with temperature) affects the density of seawater, it can play a role in its vertical stratification. Increasing salinity by one kg/m3 results in an increase of seawater density of around 0.7 kg/m3.

In the midlatitudes, an excess of evaporation over precipitation leads to surface waters being saltier than deep waters. In such regions, the vertical stratification is due to surface waters being warmer than deep waters and the halocline is destabilizing. Such regions may be prone to salt fingering, a process which results in the preferential mixing of salinity.

In certain high latitude regions (such as the Arctic Ocean, Bering Sea, and the Southern Ocean) the surface waters are actually colder than the deep waters and the halocline is responsible for maintaining water column stability- isolating the surface waters from the deep waters. In these regions, the halocline is important in allowing for the formation of sea ice, and limiting the escape of carbon dioxide to the atmosphere. Haloclines are also found in fjords, and poorly mixed estuaries where fresh water is deposited at the ocean surface.

A halocline can be easily created and observed in a drinking glass or other clear vessel. If fresh water is slowly poured over a quantity of salt water, using a spoon held horizontally at water-level to prevent mixing, a hazy interface layer, the halocline, will soon be visible due to the varying index of refraction across the boundary.

A halocline is simply a region below the surface of a body of water where there is a significant increase or decrease in density. Density may be found by using the equation P = Mass / Volume(g / cm3)

Salt water is more dense than fresh water, and so light rays are diffracted when they pass through the halocline. This can give rise to a range of unusual visual effects, like salad oil and vinegar.

sources: Wikipedia, Cave-exploration.com

[Book] International Regulations for Preventing Collisions at Sea (Colregs) by Capt. Pierre Deseck

International Regulations for Preventing Collisions at Sea (Colregs) by Capt. Pierre Deseck, MNI Hon. Prof. Maritime Academy, Antwerp.
Revised, updated and adapted to the IMO-amendments 1981, 1987, 1989, 1993 and 2001 (last amendment).
450 pages. Fully commented and illustrated. All lights and shapes are given with their corresponding colours. Complies with the STCW Convention.
Excellent study book for nautical students. An indispensable reference book for all officers of the watch, lawyers, classification societies, builders, insurance companies, P & I clubs, etc.
Please go to http://maritimeknowhow.com and click on “COLREGS” or on “Newsletter 01” for full detail.
An excellent season’s gift
Capt. Pierre Deseck
E-mail: maritimeknowhow@skynet.be