At present complex numerical hydrodynamical models exist, however, easier models should not be forgotten as they really assist in the understanding of the large and fine scale "climatology" of the lakes. Here some of these models used by the authors, and which focus on the dependence of the circulation on geometric factors, are commented on. Further, the coupling effect between the pattern of the wind regime and the lake topography is discussed by using the results of a one-layer model. A guide for writing this model -finite differences (H-M scheme)- is included together with the stability criteria -Fourier method-.
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