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Search Results: 1 - 10 of 462620 matches for " Manojlovi? Predrag A. "
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The methodological aspect investigation of intensity of chemical erosion
ManojloviPredrag A.
Glasnik Srpskog Geografskog Dru?tva , 2002, DOI: 10.2298/gsgd0202035m
Abstract: Researching of intensity of chemical erosion nowadays includes different methods, which can be divided into three groups: laboratory experiments, terrain experiments and empirical methods. This work analyses some methods and results that are obtained by their use.
Chemical erosion intensity in the Ni ava catchments
ManojloviPredrag A.
Glasnik Srpskog Geografskog Dru?tva , 2002, DOI: 10.2298/gsgd0201003m
Abstract: The Ni ava catchment comprehends the area of 4068 km2. There are differences in erosion intensity due to different physical-geographical characteristics of that area. Mechanical water erosion in the Ni ava catchment is 302,4 m3/km2/yr and chemical erosion is 67,2 t/km2/yr. Space differences are large (47,1-115.5 t/km2/yr) and are mostly determined by hydrological and lithological characteristics of that area.
The silt carrying in Jerma river basin
ManojloviPredrag A.,Mustafi? Sanja,Dragi?evi? Slavoljub
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.
The basic morphometric characteristics of Serbian relief
ManojloviPredrag A.,Dragi?evi? Slavoljub,Mustafi? Sanja
Glasnik Srpskog Geografskog Dru?tva , 2004, DOI: 10.2298/gsgd0402011m
Abstract: By using the database that is based on grid system of 1 km2 from Laboratory of physical geography, few quantitative maps have been made. Their researching and analyzing can show global relations on Serbian territory. Their importance overcomes geomorphologic needs, because they could be used for spatial planning, economic needs and environment protection.
Contribution to the research of the chemical intensity erosion in the western Serbia
Dragi?evi? Slavoljub,ManojloviPredrag A.,Mustafi? Sanja
Glasnik Srpskog Geografskog Dru?tva , 2003, DOI: 10.2298/gsgd0301007d
Abstract: Based on the research of the chemical erosion intensity in the upper course of Tamnava, the appearance of its negative value has been found. Further researches, that enclose the lower course, confirmed this fact. This research opened the important question about the causes of this phenomena. Analytical method eliminated all expected causes and led to conclusion that the reason for this should be found by using the more precise research of the mineralisation of the precipitations. It was necessary to continue the measurings of the precipitation mineralisation in the greater number of locations and in the wider time period, as well as in the different meteorological conditions, and after that to establish the subordination between the amount of precipitations and the entered TDS. Only after these additive researches we could be able to find out the relation between ''entry'' and ''exit'' and to find out the intensity of the chemical erosion in this, and in the other river basins. For now, we are able only to find out the carrying of TDS, as well as the reduction of the chemical evacuation for the non - carbonated part of the basin (corrected value).
The influence of seasonal factor on chemical dissolving of limestone variability in Svrlji ka valley
ManojloviPredrag,Damnjanovi?-Raki? Milica
Glasnik Srpskog Geografskog Dru?tva , 2006, DOI: 10.2298/gsgd0602029m
Abstract: How big is the influence of climatic factor on the intensity of rocks dissolving (limestone) in Serbia? Previous investigations of rivers water chemistry changes have shown it insignificance. This investigation shows significant collective influence of climatic elements contained in "seasonal factor".
Temperature changes in Serbia and worldwide according to satellite data
Lukovi? Jelena,ManojloviPredrag,Mustafi? Sanja
Glasnik Srpskog Geografskog Dru?tva , 2009, DOI: 10.2298/gsgd0903177l
Abstract: In this paper the air temperature changes have been investigated on the base of satellite measurement, in the period from 1979 until 2006. The analysis has shown that there is no temperature amplification with altitude. Data for Serbia have shown negative trend of temperature in the last 20 years of the investigated period. Although it is not statistically significant, the sign is not in accordance with the increasing CO2 concentration. This may mean that the sign of satellite temperature doesn't support hypothesis about domination of anthropogenic greenhouse effects. .
Risk of artificial lake 'Zavoj' to processes of erosion: Methodological, knowing and protecting aspect
Mustafi? Sanja,Kostadinov Stanimir,ManojloviPredrag
Glasnik Srpskog Geografskog Dru?tva , 2008, DOI: 10.2298/gsgd0801029m
Abstract: In this paper land erosion has been investigated from its temporal and spatial variability point of view. The aim of the application of contemporary soft wares and satellite observations was to create an adequate data base which allows faster and more adequate possibility for monitoring the intensity of erosive processes, as well as meaningful decision for application of different ways of anti erosive techniques of the most dangerous areas. Geomorphologic mapping of erosive processes using plane and satellite images has allowed rational planning of field observations and, at the other side very detailed establishing of the intensity of previous erosion. A new approach applied in this paper during data processing of all relevant parameters influencing erosion is based on using of software Geomedia 5.2 (Intergraph).
Mineralization of the surface waters in the Viso ica drainage basin: Supplement for the landscape-ecologic analysis
Mustafi? Sanja,ManojloviPredrag,Milin?i? Miroljub
Glasnik Srpskog Geografskog Dru?tva , 2009, DOI: 10.2298/gsgd0904141m
Abstract: The drainage basin is spatially and functionally clearly defined and relevant hydrologic, geomorphologic and ecologic landscape totality. Therefore, it mostly represents basic geo-spatial unit of generation, monitoring, and studying numerous physical-geographical and geo-ecologic occurrences and processes. One of the most important components of geo-space, on the level of basin, is manifested through the state and quality of surface waters. So, the acceptance of systematic approach in studying mineralization of the surface waters would contribute to the deeper understanding of the process in complex systematic surroundings which drainage basin represents. The Viso ica Drainage Basin was chosen as proving ground of this kind of the research approach for several reasons. The highest specific runoff on the territory of Eastern Serbia, heterogeneous geologic structure of terrain, almost complete absence of the influence of the anthropogenic factor on the state of the environment, as well as the existence of water accumulation enabled perception of the values of dissolved mineral substances of surface waters as landscape-ecologic component of geo-space.
Methodological spot of establishing silt deposit concentration in Serbian rivers
Dragi?evi? Slavoljub,ManojloviPredrag,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.
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