Modeling Open Boundary Conditions by Using the Optimization Approach
2006
Lewis, James K. | Shulman, Igor
An optimization approach to prescribe open boundary conditions (OBCs) is proposed. open boundary conditions are chosen by providing the best fit to available observations on the open boundary and to the energy flux through the open boundary. It is shown that many local open boundary conditions widely used in the oceanographic community are special cases of the derived optimized OBCs. Numerically, the proposed methods consist of the integration of the governing equations and solving the optimization problem only on the open boundary for each time step. Results of tidal simulations for a channel and the Louisiana- Texas shelf are presented and discussed. Schemes for coupling limited area coastal models with basin scale coarse models by using optimized OBCs are proposed. Preliminary simulations of coupling a fine resolution model of the Mediterranean Sea are presented and discussed. The use of optimized OBCs is shown to be better in predicting tidal amplitudes and phases compared to the use of local OBCS. Open boundary conditions, Limited area models, Data assimilation, Coupling techniques.
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