The Gravity Wave Retardation (GWR) method is a simple technique that allows layer models to include bottom topography. Here the method is applied, and its accuracy is evaluated, for monthly climatological wind forcing in an Indian Ocean model with realistic bottom topography. This is an extension of previous studies where the GWR method was applied to idealized wind forcing in oceans with idealized basin geometry. Comparison to a model integration with a flat bottom demonstrates that GWR integrations with speed up factor up to 16 indeed capture the influence of the bottom relief and have less error in the deep volume transports. For a speed up factor of that magnitude, we also find that a GWR integration have less error than a reduced gravity model simulation. It is concluded that integrations using the GWR method gives remarkably good results for the upper layer circulation as well as the deep flow with a speed up factor of up to 8.

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