THE HÂRTIBACIU TABLELAND. GEOMORPHOLOGICAL RISKS

Florina Grecu, Maria Sandu
unpublished
The Hârtibaciu Tableland (4,000 sqkm, 80 km long and 50 km wide) is a distinct subunit of the Transylvanian Tableland. Sarmatian and Pannonian sedimentary formations represent an alternation of impermeable marly-claey strata and permeable strata of sands, loosely cemented sandstones and conglomerates with a monocline structure, locally disturbed by folds of a general E-W or N-S orientation. The grade of fragmentation in point of energy and density of slopes, geodeclivity, climate and edaphic
more » ... ditions, as well as human intervention reflect in the diversity of present-day geomorphic processes. A hierarchy of geomorphic risk classes-high, moderate and low, has been established based on slope dynamics, as the outcome of a combination of main criteria (type of dominant process, volume of material dislodged by erosion, landslides and human activity). Transition from one class to another has rather a limited value for predicting process evolution. The normal evolution of natural processes in agreement with slope balance at a certain moment, tends to stabilise the terrain. Whenever extreme natural phenomena cause imbalances on slope, bringing about changes of relief configuration and producing material damage or casualties, geomorphological hazards develop.
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