Note illustrative alla carta geomorfologica della Tavoletta Menfi (Sicilia occidentale)

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Abstract

[automatically translated] The present note is to describe the morphogenetic processes and the related landforms That Were Recognized in the area Represented by the 1: 25,000 scale topographic map IGMI named Tablet Menfi (Series 25/266 IV V F. NO). The geomorphological map was realized by using the classic methodology based on direct geological and geomorphological field surveys, integrating the acquired data with the analysis of 1: 18,000 scale aerial photos taken in 1997. From the geological point of view The Examined area is caratterizzata by the outcropping of carbonate and terrigenous sediments. The great part of the territory is affected by landslide phenomena, of different sizes and activity degree, That show recurring phases of reactivation When the blackberries intense rainfall events happen or When earth tremors occur; the present spatial distribution of landslide phenomena was Analyzed and described by means of field surveys. Landslide and water erosion phenomena affect large sectors of the Studied area, with a geographical variability That is strictly linked to the outcropping of the highly diffused clayey sediments; the temporal evolution of the mass movements is Typically slow, so the relative risk is quite low; Nevertheless, the frequent occurrence of the slope movements, Their activity degree and evolutionary trends have to be taken into careful consideration During the phases of territorial planning. In Particular, the carried out the study highlighted how the outcropping of lithologies caratterizzata by a different lithotechnical behavior, produced a landscape highly differentiated between the areas in cui clayey deposits are present and Those in cui carbonate and arenaceous deposits outcrop; in the first sectors landforms given by gravity prevail, while along the main fluvial axes, Carboj the river and the right tributaries of the river Belice, erosional and depositional landforms produced by the flowing water are recognizable; in the zones where the carbonate terrains outcrop and arenaceous the most common landforms Are Those shaped by planation processes and the ones strictly linked to the stratigraphical-structural setting, as scarps and structural surfaces. erosional and depositional landforms produced by the flowing water are recognizable; in the zones where the carbonate terrains outcrop and arenaceous the most common landforms Are Those shaped by planation processes and the ones strictly linked to the stratigraphical-structural setting, as scarps and structural surfaces. erosional and depositional landforms produced by the flowing water are recognizable; in the zones where the carbonate terrains outcrop and arenaceous the most common landforms Are Those shaped by planation processes and the ones strictly linked to the stratigraphical-structural setting, as scarps and structural surfaces.
Original languageItalian
Pages (from-to)235-252
Number of pages18
JournalNATURALISTA SICILIANO
Volume33
Publication statusPublished - 2009

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