The given work is dedicated to the development of a system for real-time monitoring of river-type aquatic ecosystems. The developed system can be applied to forecast the dispersion of pollutants on the surface and on the river banks [1]. The monitoring system presents a network of mobile sensors, which are located on the surface of the river water, moving along its course, carrying out operations of occurrence of pollutants in water, data processing and storage. When approaching the reference stations (Access Points) the mobile sensors transmit the data accumulated on a server for their centralized storage, processing and analysis. For modeling the process of pollutants’ spread, in the paper work, the aquatic ecosystem of river type, is defined as a dynamic process 4 PR  , where 4 , , , R x y z t is a system of space-time coordinates [2]. The surface of the water is defined as a set of discrete nodes in which the respective calculations are performed. The mathematical models of interpolation or extrapolation are applied to calculate the intermediate values between the nodes.