THE INFLUENCE OF THE HYDROTECHNICAL WORKS
ON THE NATURAL REGIME OF WATER FLOW IN THE TISMANA RIVER BASIN (1966-2011)
marius ARjocu, andreea mihaela ARba
ABSTRACT. – The influence of the hydrotechnical works on the natural regime of water flow in the Tismana river basin (1966-2011). The Tismana river basin is located in the South-West of Romania, collecting its waters mainly from the South-West of Vâlcan mountains and, to a smaller extent, from the Tismana depression, being known for the variety of hydrotechnical works executed on it, having a complex hydrotechnical fitting. Tismana river does not have a natural flow regime because it benefits from an input of water from the water collections on the Cerna river, transferred in Motru river and, after that, in Tismana river, but also from the water coming from the Clocotiş accumulation on Bistriţa river. The only permanent accumulation on Tismana river (Tismana accumulation) was commissioned in 1983, with a hydropower purpose, taking over the turbined waters from Tismana CHE. Thus, the commissioning of the Cerna-Motru-Tismana hydropower system and, subsequently, of the Bistriţa-Tismana hydropower system, has had effects on the natural regime of water flow in Tismana river. In this river basin, the effects of the fitting works and of the water facilities have manifested after their execution. These effects could be identified in all the types of regime water flow on Tismana river.
Keywords: hydrotechnical works, hydrotechnical fitting, flow regime, natural regime, changed regime, water input, water collections, permanent accumulation.