- 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: Assessment of flood risk zonation and landscape vulnerability to flood are fundamental aspects in flood risk management. Landsat 8 Operational Land Imager (OLI) and ASTER DEM data were used to assess landscape vulnerability to flood inundation and flood risk in Malda district of West Bengal state, India. Flood inundation map was prepared on the basis of water and non-water pixels on images (before and during the flood event). Flood risk map was prepared using equal interval of separation based on elevation and inundated flooded area. Flood inundation map was overlaid on the pre-monsoon land use/land cover map to produce landscape vulnerability to flood. The results revealed that 19% area of the district was flooded during monsoon flood event in 2014 and the agricultural area was most affected land use, sharing 62% of the total flood affected area, followed by river bed (21%), built up (7%) and vegetation (5%). The flood risk map of the district shows that temporary river islands, sand banks along the Ganga river course lie in low flood plain and were considered under high risk zone. The flood plain alongside minor stream drainage in southern, north-western and in between them comes under medium flood risk zones. Flood risk is low in areas which are away from the rivers. Non flooded areas were identified in high lands of eastern region of the district. Landscape vulnerability map shows that the blocks located along the Ganga river namely Kaliachak I, Kaliachak II, Kaliachak III, Manikchak, Ratua I were highly vulnerable to flood. The study suggests that efforts should be made to remove the sediments for increasing the depth of river. Spurs and bed bars should be constructed to avoid great loss of prime agricultural land, property and lives of people.
Abstract: Anina Mining Area was defined by Vasile Sencu in 1977 as the area that is surrounding Anina town and may be exploited by mining activities. The aim of this paper is to present two parameters regarding geomorphometry in Anina Mining Area, naming here Geomorphological Risk and Denudational Index (Land Erodability Index). These two morphometric parameters are obtained using geomorphological parameters that we obtained in previous works, as slope, hypsometry, drainage density, depth drainage and morphodynamic potential. The methodology to derive Geomorphological risk and Denudational index (Land Erodability Index) is based on GIS techniques.The results we obtained point out that the study area of this paper is a region where parameters such as geomorphological risk and denudational index have small incidence. This fact is due to the large homogeneous areas from the standpoint of geology and land cover, but also as an effect of large surfaces with a planar aspect as karstic plateaus. From the analysis of these two parameters we must conclude that Anina Mining Area represents a space with small surfaces which are prone to risks associated with geomorphological process and also with small areas where denudation may have high rates due to the large areas where vegetation is present and also due to large plateaus where the primary processes are related to karstification, and these ones are very slow processes.
Abstract: Stream erosion is a widely spread process in the Getic sub-Carpathians and Plateau (including the study sub-units). It is controlled by the high density of small drainage basins on a surface unit. Development of the 4th and 5th order valleys (according to Strahler’s system) in the sub-Carpathians and of the 3rd and 4th order in the Olteţ Plateau was also determined by the high altitude of hillslopes, up to 450 meters in the Vâlcea sub-Carpathians and to 250 meters in the Olteţ Plateau, a consequence of the strong downcutting performed by the Olt river and its main tributaries in this area (Olăneşti, Bistriţa, Cerna and Olteţ). Another control factor is the friable bedrock made of sedimentary deposits: conglomerate, gravel, sand, sandstone, marl, clay, tuffs etc. in the Vâlcea sub-Carpathians and Cândeşti strata (gravels with clayey lens of Villafranchian age) in the Olteţ Plateau.
Abstract: Bangladesh is mainly formed by alluvial deposits, facing riverbank erosion very frequently due to unvarying alteration of river channels. This study is aimed at computing the actual bank shifting along the Manu River within Bangladesh for a period of thirteen years (1997-2010). The entire course of Manu River from upstream of India Border, Moulvibazar to the confluence with the Kushiyara River at Manumukh, Sherpur for a stretch of around 69 km has been studied using an integrated approach of Remote Sensing and Geographical Information System (GIS). The channel configuration of the Manu River has been mapped for the years 1997 and 2010 using Landsat satellite images. The analysis divulged that the Manu River is a highly meandering river with several very critical sections where the river has been suffering enormously with the erosion problem and shifting characteristics. The enumerated river shifting was found very high as the maximum left bank shifting and maximum right bank shifting had occurred at Rajnagar, Moulvibazar of 656 m and 628 m respectively, in the mentioned period. The results deliver latest and steadfast evidence on the dynamic fluvio-geomorphology of the Manu River for designing and execution of erosion control schemes.
Abstract: The various natural resources and the industrialization policies implemented during the communist regime have resulted in the opening of many mines and quarries, inclunding the Mount Mateiaș exploitation. The aim of this study is to give warning against open pit mining, which has a direct and conspicuous impact on landscape dynamics and the cultural-historical value of Mount Mateiaș. The research methodology consisted in field observations, accomplished during the period 2009-2012, the analysis of limestone quarry expansion by using GIS techniques, and the application of a semi-structured interview, the results of which were processed subsequently in QSR-Nvivo 10. The analysis and processing of cartographic materials highlighted that during the interval 1979-2012 strip mining has dramatically altered the topography (by excavation works, land leveling, access road construction, accelerated slope erosion, collapses, torrential erosion etc.). These add to other processes and phenomena that have a negative impact on the environment (soil loss, massive deforestations, air pollution with suspended particles etc.). Despite these realities, most people living in the neighborhood of Mount Mateiaș (the Valea Mare-Pravăț, Dragoslavele, Stoenești and Câmpulung communes) deem that quarrying is vital for the development of local communities. Under the circumstances, the only economically productive and ecollogically protective measure advanced by the authors is the identification of possible solutions for the restauration of the quarry, given that limestone exploitation will not end in the medium term. Last, but not least, we suggest that the results of the present investigation be included in the pre- feasibility and feasibility studies of a potential future rehabilitation.
© 2009- 2026 Forum geografic
Designed by Alin Clincea.
