IMPLEMENTATION AND ASSESSMENT OF A ONE-WAY NESTING TECHNIQUE FOR HIGH-RESOLUTION WIND FLOW SIMULATIONS

A one-way nesting technique is implemented in the mesoscale model MEMO with the objective to generate numerically lateral boundary values fo r high resolution wind dow simulations. This is of special importance in cases where measured data are too sparse for the proper description of the flow outside of the model domain. The presented technique does not require a filter to dampen spurious wave energy. The nested versi on of MEMO is used to simulate the wind flow in the Greater Athens Are a (GAA) in the framework of the international model intercomparison ac tivity APSIS. Simulation results of both the nested and the unnested m odel Version are evaluated by the aid of measured data. The evaluation results reveal that implementing the nesting technique in the prognos tic mesoscale model MEMO improves the calculated results. (C) 1997 Els evier Science Ltd.