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Search Results: 1 - 10 of 3093 matches for " Dragi?evi? Slavoljub "
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Changes of the intensity of Ljig river basin erosion: Influence of anthropogenic factor
DragieviSlavoljub,Stepi? Milomir
Glasnik Srpskog Geografskog Dru?tva , 2006, DOI: 10.2298/gsgd0602037d
Abstract: According to new field investigations as well as mapping of erosion in Ljig river basin we have found out that its intensity has changed in regard to period of 40 years ago. The most expressive changes were noticed in Ljig river basin. As we have not noticed changes in physical-geographical factors the cause of the intensity decrease might be only influenced by indirect anthropogenic factor. Processes of growing old and decrease of rural population, migration village-town, marginalization of agriculture and decrease of cattle reserves caused the changes of land utilization. Agriculture areas were becoming overgrown with growing wild vegetation which restrained gradually considerable expressed processes of erosion in the past.
Methodology update for determination of the erosion coefficient(Z)
To?i? Radislav,DragieviSlavoljub
Glasnik Srpskog Geografskog Dru?tva , 2012, DOI: 10.2298/gsgd1201011t
Abstract: The research and mapping the intensity of mechanical water erosion that have begun with the empirical methodology of S. Gavrilovi during the mid-twentieth century last, by various intensity, until the present time. A many decades work on the research of these issues pointed to some shortcomings of the existing methodology, and thus the need for its innovation. In this sense, R. Lazarevi made certain adjustments of the empirical methodology of S. Gavrilovi by changing the tables for determination of the coefficients Φ, X and Y, that is, the tables for determining the mean erosion coefficient (Z). The main objective of this paper is to update the existing methodology for determining the erosion coefficient (Z) with the empirical methodology of S. Gavrilovi and amendments made by R. Lazarevi (1985), but also with better adjustments to the information technologies and the needs of modern society. The proposed procedure, that is, the model to determine the erosion coefficient (Z) in this paper is the result of ten years of scientific research and project work in mapping the intensity of mechanical water erosion and its modeling using various models of erosion in the Republic of Srpska and Serbia. By analyzing the correlation of results obtained by regression models and results obtained during the mapping of erosion on the territory of the Republic of Srpska, a high degree of correlation (R2 = 0.9963) was established, which is essentially a good assessment of the proposed models.
Changes of Danube discharge parameters at Or ava hydrological station: In the period 1841-2000
Duci? Vladan,Nikoli? Jugoslav,DragieviSlavoljub
Glasnik Srpskog Geografskog Dru?tva , 2006, DOI: 10.2298/gsgd0601035d
Abstract: The aim of this research was to determine long-term trend of discharge, over its different parameters. Hydrological station Or ava is selected not just because of series’ length but also reliabilities of observation. By analyzing data, we exclude possible local and regional anthropogenic influences on discharge. Trend analyzes of all parameters of the Danube discharge near Or ava hydrological station in the period of 160 years show increase of discharge and decrease of extremeness.
The analysis of precipitation conducted on the upper watershed of the West Morava river
Nikoli? Jugoslav,Duci? Vladan,DragieviSlavoljub
Glasnik Srpskog Geografskog Dru?tva , 2005, DOI: 10.2298/gsgd0501019n
Abstract: Precipitation is one of the basic elements of the water balance and its analysis is of the crucial importance for many scientific areas. The analysis of precipitation, conducted on the upper part watershed of the West Morava River, was done in the complex way, with the use of the appropriate numerical model. In this way, among other things, orographic and dynamic effects on the explored terrain are taken into consideration.
The risk of slope processes on the territory of Ub municipality
DragieviSlavoljub,Novkovi? Ivan,Prica Marko
Glasnik Srpskog Geografskog Dru?tva , 2009, DOI: 10.2298/gsgd0903147d
Abstract: Stereotype researches of natural conditions on the territory of Serbia have caused limited application value of the large number of recent development strategies and planning documents of different purpose. The best indicator of this is the Strategy of development of planning area of the municipality Ub where, apart from general analysis of natural potential, determining the areas endangered by different intensity of geomorphologic processes was neglected in many ways. At what extent the territory is at risk of slope processes represents an important factor in choosing the location and planning the purpose of the land use, and in defining the degree of concentration of physical structure and objects of infrastructure. This kind of analysis is unavoidable segment of strategy for spatial development of some territory. Therefore, apart from the analysis of natural conditions as the potential of development of some territory, the same attention should be paid to rightful assessment of degree of impairment of the territory, i.e. limitations for its development and growth. .
Methodological spot of establishing silt deposit concentration in Serbian rivers
DragieviSlavoljub,Manojlovi? Predrag,Nikoli? Jugoslav
Glasnik Srpskog Geografskog Dru?tva , 2007, DOI: 10.2298/gsgd0701015d
Abstract: Recent methodology of sampling and establishing silt deposit concentration in Serbian rivers is associated to numerous deficiencies. Daily concentrations of this type of river deposit on the most of the hydrological gauges were obtained on the base of only one measurement, which takes into consideration the matter of representative ness of those samples. Taking the samples of deposit in one point on the profile is little bit problematic because of dispersion of the obtained results. Very important matter is the question of choice of the sampling location. This analyses of data may lead to serious spots in calculating total carried deposit. From the above mentioned reasons, we decided to take precise measurements of silt deposit concentration as well as to establish methodological spots of measurements. The results of these measurements are analyzed and presented in this paper.
The erosion intensity changes in Zaje ar municipality
DragieviSlavoljub,Novkovi? Ivan,Milutinovi? Milena
Glasnik Srpskog Geografskog Dru?tva , 2009, DOI: 10.2298/gsgd0904003d
Abstract: Apart from other geomorphologic processes (glacial erosion, nivation, abrasion) which are predominantly determined by the intensity of natural factors, soil erosion is significantly determined by anthropogenic influences. Despite the fact that the physical-geographic factors are important determinants of the erosion intensity this geomorphologic process has also demographic, socio-economic, environmental, and multidisciplinary aspects as well. Control works, some demographic characteristics of the territory and the type of land use are the direct and indirect anthropogenic influences and modifiers of the intensity of this process. The basic idea of this paper is to assess the basic socio-geographic change over certain area and to determine its effects on the erosion intensity.
Digital elevation model and satellite images an assessment of soil erosion potential in the Pcinja catchment
Milevski Ivica,DragieviSlavoljub,Kostadinov Stanimir
Glasnik Srpskog Geografskog Dru?tva , 2007, DOI: 10.2298/gsgd0702011m
Abstract: Pcinja is large left tributary of Vardar River (135 km long, 2877,3 km2 catchment’s area), which drainages surface waters from northeastern Macedonia, and small part of southeastern Serbia. Because of suitable physical-geographic factors (geology, terrain morphology, climate, hydrology, vegetation coverage, soil composition, and high human impact), some parts of the catchment’s suffer significant erosion process. For this reason, it is necessary to research properly spatial distribution of erosion, then influence of physical and anthropogenic factors for the intensity of soil erosion, related erosion landforms (with morphology, genesis, evolution, soil erosion protection etc.). Earlier researches in the area have been performed generally with combination of cartographic and classic field analysis. But in last decades, there are new possibilities available like satellite images and digital elevation models. In this work has been presented the methodology of utilization of satellite images and DEM for erosion research, with analysis and comparisons of outcome data.
Application of remote sensing methods and GIS in erosive process investigations
Mustafi? Sanja,Manojlovi? Predrag,DragieviSlavoljub
Journal of the Geographical Institute Jovan Cvijic, SASA , 2007, DOI: 10.2298/ijgi0757465m
Abstract: Modern geomorphologic investigations of condition and change of the intensity of erosive process should be based on application of remote sensing methods which are based on processing of aerial and satellite photographs. Using of these methods is very important because it enables good possibilities for realizing regional relations of the investigated phenomenon, as well as the estimate of spatial and temporal variability of all physical-geographical and anthropogenic factors influencing given process. Realizing process of land erosion, on the whole, is only possible by creating universal data base, as well as by using of appropriate software, more exactly by establishing uniform information system. Geographical information system, as the most effective one, the most complex and the most integral system of information about the space enables unification as well as analytical and synthetically processing of all data.
The silt carrying in Jerma river basin
Manojlovi? Predrag A.,Mustafi? Sanja,DragieviSlavoljub
Glasnik Srpskog Geografskog Dru?tva , 2003, DOI: 10.2298/gsgd0302003m
Abstract: The silt carrying in the upper part of Jerma river basin in amount of 82.3 t/km/year is relatively high, considering the situation in all Serbia. The specific silt carrying in the upper part of Crnica river basin is 23.9 t/km/year (Manojlovi P.), while it is even lower in the basin of Crni Timok river (3.5 t/km/year; Manojlovi P, Gavrilovi Lj. 1991.). In the Kolubara river basin, the specific mechanical water erosion is between 4.6 t/km/year (Gradac) and 73.2 t/km/year in Tamnava basin (Dragicevic S. 2002). Greater erosion in the upper part of Jerma river basin is result of great part of metamorphic stones that intensively disintegrates and significant anthropogenic influence in Znepolje. The great slopes at the left side of the basin, under the Ruj mountain, should be considered, too. That doesn't mean that the erosion is strong, because, for example in the basin of Beli Timok, between Knja evac and Zaje ar, it is 186 t/km/year. Following regression, base on flow and silt concentration values can calculate the silt carrying very precisely: t/day=6251+26875 - C+1058 - Q Based on beta coefficients (0.73 for silt and 0.31 for flow) it could be concluded that concentration of silt has greater influence on erosion, than flow. More interesting is the influence of seasonal factor on the carrying of suspended silt. Months with the highest amount of carried suspended material are March, April and May. During these months 50.5 % of average yearly value is evacuated from a basin. Similar excessivity has been noticed in the other basins (Dragicevic S. 2002), only in other months.
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