Description of Sea Ice Regime For Offshore Construction Available to Purchase

Increasing development of exploration of offshore fields of ice-infested seas is presents the modem tendency of sea oil and gas industry. The ice cover in winter season cause the several problems for offshore carbons fields exploration. The ice force analysis on offshore structures is greatly difficulty. The last ones are unique engineering structures. Therefore the incensement of ice force definition accuracy have the great importance accounting for influence on material expense and cost of these objects. Numerical methods have found wide application analysis and forecasting of ice conditions. But the similar calculations were usually oriented on providing for navigation and description of processes of geophysical scale in the system "the atmosphere-ice cover-ocean". As a result of coarse resolution the corresponding mathematical models of ice cover evolution for large areas or whole seas cannot be directly used to calculate ice influence on offshore structures. Existing approach to ice force analysis was based upon results of detailed observations of ice cover parameters and ice physical properties. But such an approach is very money consuming as need the continuous multi-year field observations series on ice regime variability at the site. We propose the combining method of describing ice regime at the site that is based upon joining two approach together. In this case the parameters of ice regime of general character, for example, drift velocity, concentration, thickness distribution are calculated on the base of numerical model of ice cover of geophysical scale. More detailed features of ice cover state, for example, small-scale irregularities in space changes of ice characteristics, rigidity, ice cover shapes, are described by partial models received on the base of specialised observations on-situ. The two models of different scales are successfully supplement each other and give the reliable information about all parameters of interest for ice force analysis.