Numerical Simulation Of Ice Conditions In BoHai

Bohai is rich in biology,harbour,tourism and other resources.It has huge development potential and bright development prospect.Bohai sea ice is a typical "One-Year Ice".Bohai has experienced several serious sea ice disasters,among them,the direct economic losses caused by the severe ice disaster in the Bohai Sea in the winter of 2009~2010 were as high as 6.318 billion yuan.Depth study of the law of sea ice growth,establish the sea ice numerical model,and simulation of freezing and thawing of sea ice in Bohai Sea by this model,sea ice model is of great significance to reduce the loss caused by ice disaster.Firstly,the hydrodynamic model of sea ice numerical simulation is established.Twodimensional shallow water equations could be deduced by averaging the various terms in Reynolds equations along the vertical direction.The numerical model is based on the technique of unstructured triangle grid and the finite volume method is used to discretize the twodimensional shallow water equations.Calculating the numerical flux by the HLL's approximate Riemann solver,the source term is treated by the matrix vector divergence and the full implicit method to guarantee the stability of the scheme.On this basis,given the initial boundary condition,establish the hydrodynamic numerical model.Given the initial and solid boundary conditions,then use the harmonic analysis model to calculate the tidal level as the open boundary condition of the model.The accuracy and stability of this model are verified by the square dam break problem,Applying the model to simulate the tidal current field in Bohai and the simulation results are compared with the measured data,verify the accuracy of the model in the calculation of practical engineering problems and the simulative ability.Secondly,based on the hydrodynamic model,the numerical model of simulated sea ice generation was established which considering the influence of sea ice thermodynamic factors(such as solar radiation,sensible heat flux,latent heat flux,wind speed and relative humidity).The icing condition of Bohai in the light ice year?the heavy ice year and the normal ice year are calculated by using the model,and compare the calculated results with the measured data.The calculation results show that the light ice year and the normal ice year of ice in good agreement with measured data,validated the model's practicality and accuracy.Due to the lack of meteorological data,it is impossible to fully study the icing conditions of heavy ice years with extreme weather conditions,but the calculation results also have some guiding significance.Finally,using the model to analyze the sensitivity of the thermodynamic factors influencing the sea ice.The results show that the influence of temperature,wind speed and sensible heat flux coefficient on the freezing and thawing of sea ice is very important,which plays a decisive role in the generation and regulation of sea ice in winter.