G. PANDI, CS. HORVÁTH, I. R. SIMON
ABSTRACT. Călimani Mountain’s monthly average runoff characteristics and the probability of its occurrence. The Călimani Mountains represent the north-western part of the Oriental Carpathians central group, they are the most extended volcanic massive from our country. The river discharge is measured at five hydrometric stations which are distributed relative evenly around the mountains. The runoff characterization was made using the average monthly discharge values from the following stations: Topliţa, Răstoliţa, Jelna, Miţa and Gura Negrii . The used discharge data series include years between 1991 and 2006. The analysis of the runoff regimes shows that there are differences according to the topoclimatical conditions, the rivers alimentations types and the river catchments position towards the mountain. These differences refer to the extremes discharge mount and to the flow hydrographs shape. The most significant differences are between the western and northern part of the Călimani Mountains. The probability curves homogeneity makes possible the evaluation of the hazards regarding the occurrence of multiannual monthly discharge values. Hydrometric stations comparison shows that the average multiannual minim discharges hazard is higher in the eastern catchments of the mountain like in the western. Similar trends exist regarding the occurrence of the highest average multiannual discharge.
Key words: factors, river runoff, monthly average discharge, probability curve, hazard.