Differentiations in the sedimentation of the reservoirs basins from the Someşul Cald cascade system

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Article Title:	Differentiations in the sedimentation of the reservoirs basins from the Someşul Cald cascade system
Authors:	Gheorghe Şerban, Mircea Alexe
Affiliation:	„Babeş-Bolyai” University, Cluj-Napoca, Faculty of Geography, Chair of Phisical and Technical Geography
Abstract:	After a general presentation of the afferent basin of the reservoirs from the Someşul Cald Valley, the authors proced to a short analysis of the suspension flows, which determine the reservoir sedimentations. There are put into evidence several aspects concerning the drainage basin framing on the ground erosion map of Romania, distinguishing low values of this phenomenon, but also the existence of several spaces with anomaly character, respectively values among most erect, due to the presence of the friable sedimentary rocks. This aspect is confirmed by the values measured at the hydrometric stations, included in text under tables and correlation and variation charts form of the specific parameters. In the second part of the study there are emphasized several aspects concerning the zones of maximum intensity of the silting phenomenon, thanks to the graphic elements implemented with GIS technics. In the case of the four reservoirs the principal affluents outlets are characterized by important alluvial deposits, frequently organized under dejection cones form, or reefs and alluvial strings, depending on the volume and the dynamics of waters from retentions. Particular evolutions are registered in the two small lakes situated in the downstream of the system, where the lateral contribution of consistent suspension flows leads to spectacular evolutions in some basin compartments, establishing even some small deltas. Also, the existence of some hard rocks layers, which traverse the lacustrine basins, establishes a differentiated sedimentation of these compartments (example the Gilău retention). In the dam zones the delicate sediments slide quickly (for example inferior miocen clays), with negative influence in the utilization of water resources for different purposes.
Keywords:	reservoirs, suspension flow, sedimentation, accumulation shapes, digital plan model of the basins
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*Correspondence:	Gheorghe ŞERBAN, Universitatea „Babeş-Bolyai”, Facultatea de Geografie, Catedra de Geografie Fizică şi Tehnică, Str. Clinicilor, Nr. 5-7, 400006, Cluj-Napoca, România, Tel. +40-(264)-596116, Fax +40-(264)-597988, email: serban@geografie.ubbcluj.ro