- Biogeography (19)
- Climatology (36)
- Environment (76)
- Geomorphology (57)
- GIS and Remote Sensing (18)
- Human and economic geography (62)
- Hydrology (54)
- Regional geography (45)
- Tourism (42)
- Various (33)
Abstract: Bank erosion is one of the dominant geomorphological processes in the southern part of the Pannonian Basin. The consequences of bank erosion on the territory of Serbia and the Republic of Srpska were analysed including landscape degradation (lateral migration), socio-economic (land loss, land use changes, economical losses) and geopolitical consequences. The analysis covered the Danube River and the Drina River as the international river border, the Bosna River as a boundary watercourse along the administrative border and the Kolubara River with dominantly antropogenic impacts on the rate of bank erosion . The total amount of lateral migration of the Kolubara riverbed for the period 1925-2010 is 155 m and the Bosna riverbed for the period 1958-2012 is 352.2 m. Lateral migration has caused serious problems through loss of arable land (approximately 40 ha) and land use changes in both basins, but also economic loss due to the reduction of agricultural production. For the protection of the Bosna River banks it is necessary to invest 7.91 million Euros, while in the case of the Kolubara River for their recovery 2.54 million Euros were needed. The geopolitical consequences due to the bank erosion acting and lateral migration of the river course were analysed on three paradigmatic examples: the Danube River (the border between Serbia and Croatia), Drina River (the border between Serbia and Bosnia and Herzegovina) and Bosna River (the border between the Republic of Srpska and the Federation of B&H). The results of this investigation are applicable in the field of water and soil resources management, hydro-technical works, geopolitical studies, as well as in different aspects of the environmental protection.
Abstract: This paper presents the morpho-hydrographical characteristics that define the torrential system inside the Sebeş basin (the Parâng Mountains). The manifestation of torrential erosion takes place on river basins of different sizes. In order to bring out the quantitative and qualitative differences in the stream discharge structure, we resorted to the determination of some geomorphometrical indices such as: the number of river segments, the frequency of elementary thalwegs, incipient or total torrentiality. The great density of the temporary valleys network, along with the emphasized slope of the ditches and flanks generate a high instability. The local differentiations of the geological sublayers and the complementarity of the use of the Cindrel, Lotru and Şureanu mountain areas generate its own answer forms on the aggressive action of the torrential rainfalls on elementary segments with temporary functionality, as well as on permanent hydrographic thoroughfares. The tributary streams received by the Sebeş River in the Carpathian sector have small hydrographic basins and they do not exceed rank 4 in the Horton-Strahler classification system. Torrentiality is stimulated by the combined effect of snowmelt and spring rains, but mostly by the aggressiveness of the torrential summer rains, which take over a modified geomorphological background through excessive depasturage, deforestation and hydropower harnessing. The streams and the floods, through the accumulation of high volumes and energies, produce slope damages, riverbed shifts, blockages and the destruction of communications infrastructure, and material loss.
Abstract: In the present paper we present a new method of evaluating the geomorphosite. The method is presented by us/ our team and it was tested in the protected area Ponoare. In the first part of the article, we will apply, for the geomorphosites inventorized here, the other methods of evaluation known worldwide, and after that we will evaluate geomorphosites by following the new method proposed by us, a method which is adapted to geomorphological reality and to the reality of touristic exploitation of the analysed area. There were taken into account the methods developed up to now in the specialized literature, namely: the method of evaluating the touristic value of geomorphosites for the evaluation of the touristic value conceived by J. P. Pralong in 2005, the method developed in 2007 by E. Reynard et al.; the method developed at the University of Modena and Reggio Emilia by P. Coratza and C. Giusti in 2005; and the method proposed at the University of Cantabria by V. M. Bruschi and A. Cendrero in 2005; the method developed by the University from Valladolid by E. Serrano and J. J. Gonzales Trueba in 2005; the method proposed by the University of Minho in 2007 by P. Pereira, the Greek method developed by N. Zourous in 2005 and the Slavonian method proposed in 2012 by B. Erhatic. The results obtained show different quantitative values compared to previous methods, but comparing the rank obtained by each geomorphosite during the evaluation, the rank stays the same. The values are situated in a different deviation compared to other methods, having in view that for additional values firstly the cultural value is reduced in the analysed area.
Abstract: After a brief presentation of the Bârlad catchment, the hydrographic network is analyzed using the Horton-Strahler classification system. From the amount of morphometric parameters, the drainage and the slope patterns are taken into consideration for the entire Bârlad catchment and for the 13 hydrometric stations in the catchment that have data on water flows and suspended sediments. From those there were chosen the Vaslui hydrometric station as representative for the geomorphologic units of the Bârlad catchment and the Feldioara hydrometric station for the Berheci catchment. Based on the analyzed patterns there were determined a series of morphometric parameters specific to the river network for all the 13 analyzed stations and from their comparison one can see obvious differences between the obtained values for the basins in the Central Moldavian Plateau and the ones in the Tutovei Hills.
Abstract: The morphometric analysis doesn’t imply just the quantitative description of the relief, although it is frequently limited to it, but also a methodological approach that allows the typological classification of landforms and establishing some significant correlations between the selected parameters and other geomorphologic, geologic indicators etc. The testing and validation of such analyses is performed upon representative samples on different scales. This article aims to interpret some morphometric indicators and correlations within the Studineţ hydrographical basin (9669 ha), located in the central part of the Tutova Hills, in the eastern part of Romania. The region’s relief is grafted on sandy-clayey and clayey-loamy deposits from the Kersonian and Meotian, being characterized by a relatively high fragmentation for a hillyregion (Jeanrenaud, 1971, 1995). The maximum altitude gap ranges between 108.9 and 485.5 m, and the relief energy values facilitate morphodynamic imbalances expressed through different geomorphological processes. The main characteristic is the presence of cuestas with morphometric, morphodynamic and land use asymmetries. The present scientific approach analyzes every derived map by interpreting the unclassified rasters (pixel value) and the classified ones (class value), comparing the relevance of the results to obtain the optimal number of classes and to establish the limits that have the best geomorphological level of significance. Given the region’s features, the analysis of cuestas was favored to differentiate the cuesta fronts and backslopes. Finally, on a representative perimeter within the basin, the raster histograms (hypsometry, declivity, exposition) were compared, to highlight the differentiations caused by the map scale and pixel resolution.
© 2009- 2026 Forum geografic
Designed by Alin Clincea.
