Arctic Shelf hydrocarbon reserves are estimated over 100 billiard t (in oil equivalent) by different experts when most part of them are in Barents, Pechora and Kara seas [Kliewer G., 2006, www.gazflot.ru]. Obviously offshore oil and gas fields will be intensively developed at the next decades. And the process has being in progress if take in mind started exploration offshore Sakhalin, and ice gravity platform "Prirazlomnaya" has left Murmansk Aug 18, 2011 (when first well to be drilled until end of 2001 as per planning) [www.gazprom.ru]. And soil investigations are completing for Shtokman project design and construction.

That is why problems of environment study and forecast for designing and construction are getting special value and significance. When name "environment" we have to understand it means three components: atmosphere, hydrosphere and lithosphere; they all have some specificity in the area.

Sever climate with long period of negative temperature and strong continuous winds, influence of hydrodynamic and ice factors, specific soil extend, permafrost and post cryogenic processes are the features. The main geo hazards spread along Arctic Shelf are caused by acting of:

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    oceanlogical factors (wave, wind, tide, etc),

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    ice, icebergs, stamukhas, hummocks,

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    lithodynamic influence,

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    subbotom permafrost and post cryogenic processes,

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    tectonics and seismicity,

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    anthropogenic factors,

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    structure of soil section (weak and non-homogenic soils, specific deposits),

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    sea bottom morphology features (variability of sea flour, water depth etc).

    It should be noted phenomena and processes of water and air mediums have been recording over centuries by man already and that is why they are learnt enough. The main problem come up at engineering-oceanlogical investigation is reliability of forecasts to be a function of observation duration first of all.

Normative documents of GOSSTROI and POSGIDROMET specify the period as 1 to 5 years for production facilities of oil and gas industry. However there are no such continuous and long-term investigations in Arctic Shelf (complete series should include around-year period with extreme and moderate rows). Obviously initial data are the most important factor to be acting to reliability of the results irrespective of mean or method of modeling (mathematical, physical). For instance, AARI recorded many icebergs near Shtokman field at the ice expedition in Barents Sea, 2003 [Buzin I.V., 2006]. The formations had size of up to 0.2x0.4km and mass of upto 3.7 million ton (fig.1). Such their extremal spread and formation had not been noted for over hundred year term observation. And this was not considered at the exploration facilities designing on the field.

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