PHENOMENA IN THE SILVANIA MOUNTAINS,
INTUITIVE AND GENETIC REFLEXES
CORINA BOGDAN, I. MAC
Abstract. - Risk phenomena in the Silvania Mountains, intuitive and genetic reflexes. In the contemporary period, the scientific research under the auspices of the global development has experienced a real quantitative and qualitative revolution. Theoretically and methodologically, the widespread promotion of the “concept of discontinuity” in terms of content, significances, manifestation, implications is observed, which has become a new imperative of the nowadays geography. The phenomena of discontinuity happen as real “paroxysmal, rhythm and intensity ruptures“ in relation to the normal occurrence defined either through the average value, determined on statistical basis as hydrological, meteorological, climatic phenomena or in discrete forms, when the phenomena occur in a veiled manner and they are perceptible only through their effects, respectively the environmental reflexes. Among the notions used with reference to extreme evolutionary discontinuities, we quote: the hazard, the disaster, the calamity and the risk to which was added a series of related notions: stability, sensitivity, resilience, fragility and vulnerability. The Silvania Mountains, a representative territorial unit within Silvania Land, with a fascinating and controversial geological origin, a real petrographic synthesis with uncovered crystalline stone, brought to the surface due to erosion under the layers of Neogene sediments, as a last remaining of a grandiose Hercynian chain with a varied orientation SW-NE of which were part the Massif Central –France, the east side, the Vosges Mountains, the Black Forest Mountains, the Harz Mountains and Bohemia. In this range of mountains, we also mention the Silvania Hercynian Mountains, respectively Plopiș and Meseș Mountains.This mountainous elevation level has an important role within the landscape as "geographical discontinuity factor” on one hand, between the Someșan Plateau and the Silvania piedmontan hills (Meseș Mountains) and on the other hand, between the latter and the Oradea hills (Plopiș Mountains). The Silvania Mountains are located in the Southwest of Sălaj County, on an area of tectonic fragmentation, which involves the risk of production of some natural and anthropic risk phenomena. We consider appropriate the elaboration of an assessment and identification strategy of these risks considering the qualitative criteria (ZERMOS) which refer to three categories of risks: high, average and low and on this basis we have focused on four risk regions within the Silvania Mountains.
Key words: faults, fractures, fissures, earth fall, collapses, alluviation, meandering, gully, landslide, territorial distribution, the Sylvania Mountains
ARTICOLUL IN INTREGIME