Scientific Foundations of the Methodology of Using Water Resources in Economic and Other Activities

Planet Earth, orbiting the Sun after Mercury and Venus at a distance of 149.6 million km from the star, the primary source of Energy, is a giant vessel of water, within which every living organism of the flora and fauna also constitute vessels of water, determining the combination of the world and life on Earth. Under the influence of economic and other activities, the total volume of water on planet Earth does not change, but its qualitative composition does. Based on the unity of the actions of Nature and the economic and other activities connected to the use of water resources, the quantitative and qualitative indicators of which are formed within the spatial limits of river basin geosystems, the scientific foundations of the energy-entropy methodology for using water resources in economic and other activities are considered using the examples of the Kuban, Terek and Lower Don rivers. Problem statement. In economic activities connected to the use of water resources, the conceptual model is the natural-technical systems (NTS) of "Natural Environment-Object of ActivityPopulation" ("N.E.-O.A.-P."), in which "N.E.", "O.A." and residents "P." are in interconnection, interaction, relationship (IIR) in the zones of influence of "O.A.". The theoretical and methodological basis of such systems are the fundamental concepts of matter, energy, entropy, and time. The difference between "useful" exchange of energy and "dissipative" energy determines the fundamental concept of entropy, introduced by Clausius in 1854. The problem of entropy in the use of water resources is poorly studied.