Author(s)

Gh. Şerban

Abstract

The observations and measurements realised throughout the years on the Someşul Cald reservoirs cascade system confirm the existence of some specific risk elements (silting, reduction of characteristic volumes, changes of the aquatic environment etc.). The cooperation with the specialized units engaged in the administration of lakes (The Romanian Water Authority – \“Someş-Tisa” Cluj Water Department, S. C. Hidroelectrica S.A. – Cluj Branch, S. C. \“Someş” S.A. Cluj Water Company), has proved fruitful, as they have made it possible to supplement the information database. The application of digital analysis and G.I.S. technology in the data processing and modelling made the attainment of some important conclusions possible, as well as the establishment of the shortterm tendencies of evolution of the phenomena and processes in the basins. The results obtained were applied to the activity performed by the forementioned institutions. Keywords: reservoirs, silting, characteristic volumes, silting trend. 1 Introduction With a full capacity of more than 330 million m3, the four reservoirs of the Someşul Cald Valley (Fântânele, Tarniţa, Someşul Cald and Gilău) represent an important water reserve capitalized energetically and supplying water for an extensive area and a large number of inhabitants (more than 600,000). Their location toward the outskirts of the northern part of the Apuseni Mountains (in the area of outcrop of the sedimentary rocks) and in the neighbourhood of a large city (Cluj-Napoca) determined the appearance of numerous elements of risks in the optimum exploitation of the potential of the basins, see fig. 1.

Keywords

reservoirs, silting, characteristic volumes, silting trend.