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A Lagrangian numerical model is used to simulate upwelling in an idealized large lake. This simulation is carried out to test the model's potential for simulating lake and ocean circulations. The model is based on the slippery sack (SS) method that was recently developed by the authors. It represents the lake as a pile of conforming sacks. The motions of the sacks are determined using Newtonian dynamics. The model uses gravity wave retardation to allow for long time steps and hasdoi:10.1175/1520-0493(2004)132<0066:suiall>2.0.co;2 fatcat:e75ptrt6c5hw7esjxdafh5lpue