Modelling of Water Cycle Processes

Abstract

World drinking-water stocks are limited and this means that water is a limiting factor that defines people’s living conditions and ecosystems all over the world. It is clear that modelling the global water cycle is a complex task and can give an approximate estimation only. More exact estimations may be done for separate water cycle processes only when their coefficients and boundary conditions are well defined. The aim of this work is to develop the model of water use as a water cycle process and to define necessary and sufficient conditions of water-using regimes’ stability. As a result of modelling, a common criterion of stability of water-using regimes is proposed. This criterion includes the necessary condition based on the radioactive balance criterion, and the sufficient condition that is defined by a pulse migration value. The considered approach permits to define the boundary of stable areas of water system processes and systems themselves. In the area of instability, a crash water issue arises that leads to the disturbance of an assimilated system capacity.