Morphometric characterization of a calanchi inventory in Sicily, Italy

Risultato della ricerca: Other

Abstract

Calanchi are a frequent type of badland landscape of Sicily (Italy), usually located in the middle of cropsor forests. They are characterized by heavily dissected terrains with unvegetated slopes, knife ridge edges,V-shaped valleys and channels with a dendritic pattern, which incise and extend headwards. Calanchiexhibit, in smaller temporal and spatial scales, many of the geomorphic processes and landforms that mayby observed in a fluvial landscape, hence, this type of badland may be considered as micro-watershedswhere geomorphic dynamics can be related to their geometric features. The aim of this investigation wasto evaluate the morphometric characteristics of calanchi landforms in Sicily (Italy). For this aim, DEMsobtained by LiDAR technology, with a horizontal and vertical resolutions of 2 m and 0.1-0.2 m, respectively,were used. In addition, orthophotographs with a pixel resolution of 0.25 m were exploited as a visualreference of the areas, as well as the images available on Google Earth. The morphometric characteristicswere used to test two functional relationships: 1) an empirical relationship linking the volume of sedimentseroded on a calanchi hydrographic unit to the total length of its main channel, and 2) a power relationship,established between two dimensionless groups of morphometric variables, that attests for a uniquegeometrical similarity condition between calanchi and smaller linear erosion landforms. Finally, the Hack’slaw was tested demonstrating that the shape of calanchi units becomes wider with the increasing theirdrainage area. This result was also proved by the analysis of the maximum length and width of eachlandform, which showed that width increments slightly faster than length when increasing their size.
Lingua originaleEnglish
Pagine1517-1517
Numero di pagine1
Stato di pubblicazionePublished - 2015

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