Author(s)

M. Schatzmann, J. Liedtke, B. Leitl and A. Kovar

Abstract

Modelling and Validation in an Urban Environment Invited contribution M. Schatzmann, J Liedtke, B Leitl and A. Kovar Meteorological Institute, University of Hamburg, Bundesstr. 55, D-20146 Hamburg, Germany Introduction The emergence of more and more sophisticated mathematical models for environmental applications is paralleled by an increasing public and regulatory awareness that many of these models have never undergone a procedure of formal evaluation of their quality (fitness-for-purpose). Nevertheless the models are used to assist in making decisions with profound political and economic consequences. Only recently scientific organisations, like the Clean Air Commission of the German Engineering Society (VDI 1995) or the Royal Meteorological Society (1995) in the UK, responded to this unsatisfactory state of affairs by issuing first ideas on how an appropriate model evaluation could be made. However, these

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