Formalisation of ecohydrological expert knowledge applying fuzzy techniques

Two ecohydrological expert models have been developed. The first model is defined in a biogeochemical context and consists of fuzzy sets, fuzzy relations and some fuzzy aggregation operators. The membership functions are estimated by a team of biogeochemical experts. The second model is defined in an ecological context. Quantification of knowledge is achieved through fuzzy observations by ecological experts. By generalisation of these fuzzy observations a formal model is obtained. The possibility of transforming a model to a different context is discussed in order to enable exchangeable use of the models.