Sea Ice Numerical Simulation And Its Engineering Application In The Sea

In the oibas exploitation of Bohai Sea, sea ice is an important marine environmental condition, which affects the offshore structure design, field construction and production safety. Considering the engineering requirements in oillgas development, the sea ice numerical simulation and forecasting should be applied to design anti-ice structures and to reduce ice-induced economic losses. As a project co-financed by the National Science Foundation of China and the China National Offshore Oil Bohai Corporation, the study on 揝ea Ice Numerical Simulation and Its Engineering Application in the Bohai Sea?was conducted. According to the field observations of ice conditions and ice-induced structure vibrations in the past winters at the JZ2O-2 area of Liaodong Bay, some computational parameters in the sea ice numerical model were determined, and the ice-induced structure vibrations of the MUQ platform were analyzed on the base of sea ice numerical simulation and the research of ice-structure interactions. Based on the analysis of the numerical simulation of Polar and its correlative research, two different computational methods were introduced in details while considering the ice features of the Bohai Sea,, which were Eularian Finite Different Method and Lagrangian Smoothed Particle Hydrodynamics respectively. In order to determine the computational parameters in the sea ice numerical model considering the ice characteristics of Bohai Sea, the author devoted to the field ice survey in the past 7 winters, and a great lot valuable data was obtained. Based on the measured data, the solar radiation at the ice surface in the whole ice period was analyzed, and its influences on the other thermodynamic factors of ice cover were discussed. The oceanic heat flux in the different ice season of the JZ2O-2 area was calculated with the residual method, and the effects of meteorological and hydrological conditions, ice thickness and sea ice type were discussed. Three calculative methods to determine sea ice drag coefficients, i.e. eddy correlation method, profile method and momentum method, were discussed, and their application conditions were analyzed respectively. The drag coefficients of level ice under low compactness were obtained with momentum method. According to the environmental conditions of shallow water, low salinity and intensive tide in the Bohai Sea, the sea ice thermodynamic and dynamic factors are different with other sea areas. The calculative methods for solar radiation, long wave radiation, sensible heat flux, latent heat flux at ice surface, conductive heat flux in ice cover and the oceanic heat flux under ice cover were discussed. Based on the mechanism of ice growth and the numerical test, the concept of diagnostic thickness was established, and the existing conditions of diagnostic thickness were analyzed. Under different air temperature, wind velocity, relative humidity and oceanic heat flux, the diagnostic thickness was calculated. In the analysis of sea ice dynamics, the drag forces, internal ice force, Coriolis?force and ocean tilt effect were calculated and contrasted. Based on the field observations, the physical and geometrical characteristics of ice ridges were discussed. Considering the flexural failure and buckling failure in ice ridging process, a mechanical model was established to calculate the height of ridge sail. Ice ridge design parameters were determined in different area of Bohai Sea. In the sea ice numerical simulation of Liaodong Bay, the Eularian Finite Difference Method was adopted. According...