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Search Results: 1 - 10 of 87803 matches for " Mihael Bren?i? "
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Conceptual approach to modeling karst development
Mihael Breni
Geologija , 1995,
Abstract: Karst is probably one of the most complicated hydrogeological systems at all.Its structure is complex and it changes in time. In the article conceptual approaches are described which could help establishing numerical simulation models for karst development. These approaches repose on the systems theory and the concept of the pure karst.
Unevenly spaced time series analysis: Case study using calcimetry data from BV-1 and BV-2 boreholesin Ljubljansko barje (central Slovenia)
Mihael Breni
Geologija , 2009,
Abstract: Statistical analyses of calcimetric data from boreholes BV-1 (north of Podpe ) and BV-2 (south of ^rna vas) on Ljubljansko barje in central Slovenia are given. The original data are represented as unevenly spaced time series that are translated into evenly spaced time series. To calculate the interpolation weighted influence function,amodel based on the power correlated influence is defined.Parameters electionisper formed basedon the maximum entropy principle. In the reconstructed time series, autocorrelation and Fourier power spectrum analyses are performed. In both time series, a transition from white noise to red noise was detected. Such behaviour can be describedby a Lorentz process. Red noise is the result of a stochastic process with long-term memory. This effect can be seen predominantly in the autocorrelation function of borehole BV-1. In the calcimetric time series of borehole BV-2, periodicity with a period between 10.0 m and 12.5 m was also detected. We suppose that this period reflects climatic fluctuations during the Quaternary Period.
Crossing of drinking water resources protection zones by roads
Mihael Breni
Geologija , 2004,
Abstract: Crossing of drinking water protection zones by roads are very common phenomenon in Slovenia. Described are starting points for protection of drinking water resources implemented with new legislation. In the article emphasize is given on the road and drinking water interaction. This new legislation implements also procedures for new construction impact assessment on protected drinking water resources. Assessments are defined as risk analysis. Some theoretical bases for these procedures are given.
Subsidence rate of Ljubljansko barje in Holocene
Mihael Breni
Geologija , 2007,
Abstract: The article analyses the rate of subsidence of Ljubljansko barje (the Ljubljana marshland)during Holocene. The analysis is based on the reinterpretation of data from pollen diagrams taken in the BV–1 borehole north of Podpe and in the borehole BV–2 southof ^rna vas. The reinterpretation was carried out on the basis of comparison with absolutely dated pollen diagrams in the sediment of Podpe{ko jezero and diagrams at other locations in Slovenia. The main markers, which the reinterpretation is based on, are the Pinus, the concentration of which starts decreasing at 11.2 ka, and the occurrence of Fagus and Abies. The concentration of Fagus starts rising at 8.7 ka, and Abies reaches its peak at 6.4/6.9 ka and at 3.0 ka. On the basis of relation between age and depth at which the sediment occurs a simple sedimentation-consolidation model was constructed, showing that the neotectonic subsidence of the Ljubljana Moore in Holocene was uniform. The subsidence in the area of borehole BV–1 was 1.24m/ka and the subsidence in the area of borehole BV–2 1.36 m/ka. The article also poses the hypothesis that the transition from younger Pleistocene into Holocene starts in the red-brown cohesive clay representing the paleo-soil and not with the beginning of sedimentation of lake chalk.
History of hydrogeology Short description of life and work of Oskar Smreker (1854–1935)
Mihael Breni
Geologija , 2008,
Abstract: In the article life and work of Oskar Smreker (1854–1935) designer of Ljubljana waterworks born in the vicinity of the Celje city – today Slovenia is described. During his long and successful life he has designed and built many waterworks based manly on the groundwater abstraction all over the Europe and Near East. He was also veryprolific writer; he has published many papers related to groundwater flow and construction of waterworks. In the scientific literature he has been known as one of the first authors considering nonlinear theory of water flow through the porous media. After him equation that relates gradient and discharge of groundwater is named. Some literature in German speaking area defines him as one of the founding fathers of groundwater science.
Practical Guidelines for Water Percolation Capacity Determination of the Ground
Mihael Breni
Geologija , 2011,
Abstract: Determination of water infiltration capacity of ground soils and rocks represents important part of design and construction procedures of the facilities for the infiltration of clean precipitation water. With their help percolation capacity of ground as well as response of the infiltration facilities to the inflowing precipitation water is estimated.Comparing to other in situ hydrogeological tests they can be understood as simple. However, in every day’s practiceseveral problems during their on site application and desk interpretation can arise. Paper represents review of existingpractical engineering procedures during the performance of percolation tests. Procedures are described for the borehole and shaft percolation tests execution and calculation theory for stationary and non stationary percolation tests are given. Theory is illustrated with practical exercises. Interpretations of typical departures from theoretical presumptions according to Hvorslev test of non-stationary test are illustrated.
Word Geology – its Roots and Meanings
Mihael Breni
Geologija , 2011,
Abstract: In the period up to 18th century the meaning of the word geology has substantially changed; from Latin word geologia written by de Bury in the 14th century, through the use of word giologia by Aldrovandi in the beginning of 17th century and to near final definition of word geology that appeared in French Encyclopaedia from 1751.With the help of Internet some other early works not known to the literature of geology history were discovered.Among them are German books where in the title word geology is also present. Works of Zaharius Grapo, JoannesSchnabel and Johann Gregorii can be listed. Short analysis of other German geological works from the second half of the 18th century important for Slovenian territory are briefly presented. Starting from the database of earlier Slovenian publications available on the Internet an analysis of word geology early appearances in Slovene language is presented. First publication of the word root geol- appeared in newspaper Slovenija in year 1849. Amongearly authors Davorin Trstenjak was first using geological information starting in year 1853. Earliest longer textpresented information on geological work in Slovene language was published in the newspaper Novice in year 1853. Based on the available literature and other sources reinterpretation of the meaning of word geology is based in the context of its role in the natural sciences development as well as its historical context.
Monitoring of landfill influences on groundwater
Mihael Breni
Geologija , 2004,
Abstract: Landfills of waste present serious threat to groundwater. To prevent groundwater pollution from landfill monitoring is performed. Rule of groundwater pollution monitoring from dangerous substances implements principles in Slovene legislation. In everyday practice certain questions arose since validity of the rule. These questions are about responsible parties in monitoring, groundwater distribution in space, target groundwater units, characterization level of the landfill and its surroundings, background values in groundwater, table of content of groundwater monitoring plan, quality of groundwater monitoring network, phases of monitoring, maintenance of monitoring network and activation of piezometers.
Hydrogeological conditions of the Kroparica recharge area, Jelovica, Slovenia
Mihael Breni
Geologija , 2003,
Abstract: Eastern part of highly karstified plateau of Jelovica (west Slovenia) that represents big fissured and karstified aquifer is drained by the group of Kroparica springs that are positioned approximately 1 km in the south of the city Kropa. Kroparica is represented by several springs that mainly flow out from the triasic Ba~a dolomite. Some of them are positioned in the hill slope sediments. In the article litostratigraphical and structural conditions in the background of the springs are represented together with simple hydrogeologicalbalance of Kroparica aquifer recharge. It was determined that the recharge area is between 3,8 and 6,5 km2 and that the average yearly outflow is between 224 and 386 l/s. Maximum outflows are much larger and are higher than some m3/s. High fluctuation of discharges are the consequence of high karstification level of Kroparica aquifer.
Geology of Planina pri Jezeru and its environs (Slovenia)
Nina Rman,Mihael Breni
Geologija , 2008,
Abstract: The article describes the results of detailed geological mapping of the wider environs of Planina pri Jezeru north of Bohinj. In the literature the Upper Triassic massive and bedded limestone, Jurassic limestone, Cretaceous clastic rocks and Pleistocene sediments have been reported in this area up to now. The article supplements existing lithostratigraphic information by defining exact locations of the Pleistocene sediments at Planina pri Jezeru and Planina v Lazu, and of Jurassic rocks. In Poljane a Neptunian dyke and bioclastic limestone, while north of Miz na glava a flat-bedded microsparitic limestone were described for the first time.Correlation to the Triglav Lakes Valley Jurassic beds indicates equivalent facieses. Allochthon Cretaceous biocalcarenite and jasper situated east of Planina pri Jezeru are also described due to their importance for further glaciological studies. The results show that the recent lake Jezero na Planini pri Jezeru is formed due to the accumulation of Pleistocene glacial-lacustrine fine-grained sediment in till,deposited on the Dachstein limestone.
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