We studied how to run efficiently shallow-water models of an operational system for prediction of flooding at the borders of the major Dutch lakes. Aim is to combine the shallow-water models with short-to-medium weather ensemble forecasts to enlarge the time horizon. This asks for a balance between low computational times per ensemble member and the efficient use of the available resources on current hardware. Here, the essential ingredient is the domain decomposition technique in the applied shallow-water solver.
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