Uncertainty in modelling human-landscape interactions

Recent involvement in designing and developing a simulation model to allow interaction between biophysical, economic and social processes has also led to interest in uncertainty and error propagation in models. This uncertainty exists in each of the biophysical, economic and social domains. With regard to the hydrologic processes there appears to be an indeterminacy principle that makes up-scaling difficult. When this is combined with the uncertainty in the other aspects of the model it would suggest that caution is needed in interpreting output from such models.