EVOLUTION OF GROAPA RUGINOASA RAVINE STUDIED BY GIS TECHNOLOGY
Imecs Zoltán1, Gál Andrea1, Simon Éva Beáta1, Poszet Szilárd2
1 Babeș-Bolyai University, Department of Geography in Hungarian, 400006, Cluj-Napoca, Str. Clinicilor 5-7, Romania, firstname.lastname@example.org; email@example.com; firstname.lastname@example.org;
2 Sapientia University, Department of Environmental Studies, 400193, Cluj-Napoca, Calea Turzii 4, Romania, email@example.com
Abstract: - The evolution of Groapa Ruginoasa ravine studied by GIS technology. The detailed, accurate study of ravines, gullies or gully systems is a great challenge for researchers. The complexity of phenomenon, the size of the forms and in many cases the difficult accessibility increase this challenge. In order to overcome these difficulties we used besides the field surveys photogrammetric methods to study Groapa Ruginoasa ravine. The evolution of this spectacular form can be followed beginning with the Second military survey’s map (1863- 1864). Using all of the cartographic documents of the region, with the help of GIS technology one can follow the evolution in time of the ravine, at least the position and the size of it. But are the existing cartographic documents detailed enough for a thorough study of such a complex phenomenon? At first our paper presents the results regarding the evolution obtained by the analysis of the maps dating back to the 19th century. Then it presents the results obtained by the help of UAV systems. This relatively new technology – after the photogrammetric interpretation of images made from low altitude – can offer more detailed information. The orthophoto with a resolution of 6 cm, and the resulted DEM with 13 cm resolution offers the possibility of more accurate analyses and to follow up the evolution. The only measurement which exists at the moment allows us to calculate the volume of the material washed out by the Seaca valley and to make sections over it. But after repeating the measurements we’ll have the possibility of other types of analyses as well. By the comparison of data gathered from field surveys with the results of repeated airborne (UAV) image acquisition and processing we intend to check the reliability and the accuracy of using photogrammetric methods in ravine research.
Keywords: ravine evolution, headcut retreat rate, UAV, GIS;
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