System dynamics continuous modelling of the ecological subsystem of the "Kastela Bay"

Abstract The Computer Simulation Submodel of The Ecological Regional Subsystem of the “KASTELA BAY” is an extra relevant submodel of The System Dynamics Computer Simulation Model of the “KASTELA BAY” which has been developed with the help of System Dynamics. It is, in its essence, a continuous model because it is presented as a system of non-linear differential equations. At the same time, it is a discrete model, because it is presented as a system of linear differential equations (System Dynamics DYNAMO-software package). Its DT (length of intervening time = computation interval) is chopped in full accordance with the Sampling Theorem [see Shannon, in: Systems modelling and analysis, I.J. Nagrath, M. Gopal (Eds.), Tata McGraw-Hill, New Delhi, 1984; see also Nyquist, McGraw-Hill Encyclopedia of Electronics and Computers, S.P. Parker (Ed.); and see Koteljnikov, Enciklopedȳa Kibernetiki, Akademȳa Nauk Ukrainskoi, Kiev, 1975]. The System Dynamics Computer Simulation Model of the “Kastela Bay” also employs certain experience gathered by experts who had worked on the preparation of projects: “Blue Plan” and “The Methodological Basis for the Scenario of the Management of Natural Resources of the ‘Kastela Bay’ ” (1991).