1 ”Ștefan cel Mare” University of Suceava, Department of Geography, Suceava, Romania
DOI:
10.4316/GEOREVIEW.2015.25.1.276
Pages:
75 - 91
Abstract:
This study investigates the hypsometric integral (HI)
correlations with lithology and neotectonics from northern Romanian
Carpathians, Rodna Mountains. Two types of DEM were used in the
analysis (a 30 m DEM resolution with specific grid size and a non-gridded
30 m DEM resolution). Several methods have been applied in order to
calculate HI: the CalHypso GIS extension was used to automatically
extract multiple hypsometric curves from digital elevation model (DEM)
and to calculate the main statistics related to the HI by applying
polynomial fits; local indices of spatial autocorrelation were applied
using Anselin Local Moran’s I and Getis-Ord Gi* in order to see if HI
distribution has spatial patterns values and selection of valid squares
(500-m2 grid using 30-m DEM using ArcMap 10.1) for the lithological
analysis. The values of the hypsometric kurtosis density, kurtosis, skew
and density skew are increasing eastwards. Values of hypsometric
skewness for the northern slope are in range between 0.290-0.816 and
southern part between 0.414-0.507. The results show that HI values are
higher than 0.5 in the areas with recent tectonic influences especially in
northern part near Dragoş Vodă fault system. The Oligocene, Miocene,
Pleistocene and Holocene formations have low values (0.5). By comparing the HI values from
the two analyses (500 m grid size DEM and the DEM without grid size) of
the DEM we find slight differences in the HI values, especially in the
northern part of the range in Repedea, Negoiescu Mare, Fântâna and
Lala basins.
Keywords:
hypsometric integral, lithology, northern Romanian Carpathians, spatial analysis