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ABSTRACT
The present modelling of the Târnavelor Plateau is subordinated to certain geomorphologic processes with permanent and seasonal rhythm of manifestation, but with a special intensity. These are favoured by the petrographic composition of plastic rocks with a high morpho-dynamic potential, of monoclinal folding structure, of domes, by the taking over in modelling of certain slopes with different dips or of riverbeds.
The contemporary processes of modelling and the forms resulted are in a dynamic equilibrium arose from the interaction of certain active "stress" factors (force of gravity, the climate by the temperature oscillation, rich rainfall, drought etc,), the man by the activities carried on, with passive factors, of resistance (nature of the rocks, structure, preexistent relief by its morpho-metric and morpho-graphic characteristics). The modification of the normal parameters of any of the above-mentioned factor entails a qualitative leap and implicitly a modification of the equilibrium, hence a progressive dynamic of the forms of relief. The intensity and the rhythmicity of manifestation of the actual modelling processes, as well as their diversity, lead to the apparition of a varied range of degradation.
The risk character derive from the aggressiveness, the intensity, the extension and the length of manifestation of these processes and from the negative consequences they have on man and the human society, being identified four categories: weak and very weak risk, moderate risk, high risk and severe risk. The geomorphologic phenomena of risk have a certain impact on the environment conditions, on the population and the human activities and lead to the modification of the geo-components, especially of the preexistent forms of relief, visibly modifying the human habitat. There are aimed especially the geomorphologic phenomena of risk that derive from the rocks bearing to the action of the external agents, from their physical and chemical properties and from the manifestation of the present geomorphologic processes, with direct consequences upon the land degradation, upon the development of the human settlements and the social condition of the population, by the aspects they generate: loss of soil fertility, destruction of homesteads, economic losses, human lives losses, social dimension associated.
KEYWORDS: Romania, Transylvania, Târnavelor Plateau, present modelling, geomorphologic processes of slope and riverbed, geomorphologic processes of risk, potential factors, factors of release, geomorphologic risk.
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