HYBRID EXPERT-SYSTEM DELAQUA - A TOOLKIT FOR WATER-QUALITY CONTROL OF LAKES AND RESERVOIRS

An expert system to be used for assisting in control of water quality of lakes and reservoirs is presented. Its character is hybrid with regard to structure and function. Shell NEXPERT OBJECT serves as platform for the implementation, while the hypertext system ToolBook has been used to develop the user interface which consists of three levels: (1) an object-oriented geographic interface with maps of the country, region and catchment area of waters under consideration, (2) an intelligent front-end to support the handling of the simulation model SALMO and the historical data base HIDA, and (3) a user interface to consult knowledge bases of three water quality problems (eutrophication, algal blooms and pathogens). The deterministic model SALMO, empirical models of the Vollenweider-type and a fuzzy model are accessible from the knowledge bases for eutrophication and algal blooms.