Alexandra RIZAC, University of Bucherst, Romania
Determining geomorphological changes of the Jiu river course, from 1875 to 2021, using old maps
Introduction
Old maps contain several information about the natural and anthropogenic elements in the field, from that time in the near past. These maps are often used by scientist in order to capture natural phenomenon in a diachronic way. Mapping the evolution of a dynamic phenomenon in the field provides many information related to its natural mode of evolution.
Study area
The study area of the Jiu river is located in south-western Romania, in Romanian Plain. However, it flows over sveral landforms. It springs from the Carpathian arch, flows along Getic piedmont and it ends in Romanian plain where it serves as Danube tributary river. Because it flows among many landforms, is has a complex evolution.
Objective
The main purpose of this study is to measure the particularities of the riverbed in different phases of evolution captured on the old maps, using a new method chosen due to its practice nature. Also, following the processing of the obtained values, we want to determine some evolution patterns of the riverbed.
Research methods
The method used in this article was fully created due to the lack of practice methods that can be used very well on the disordered nature of the rivers. Many particularities already known, like meander amplitude, were used in this paper, but the calculation method is totally different from the usual one.
Results
The mapping process showed that in the past 165 years, the Jiu river course, in its downstream sector from Podari to Danube, suffered various geomorphological changes. The main course has changed dramatically, mainly to its channel lateral migration and meander cutting process. So, the main purpose of this study is to measure the particularities of the riverbed in different phases of evolution captured on the old maps, using a new method chosen due to its practice nature.
Mots clés : old maps|geomorphology|river|dynamics
A104854AR