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Model of spontaneous vegetation development in post-mining heap
Vodička, Jan ; Frouz, Jan (advisor) ; Brůna, Josef (referee)
Predictability of primary succession in post-mining sites is needed for choosing appropriate restoration method. This study models 18 years of spontaneous succession on a post mining heap in Sokolov in the Czech republic with using historical aerial photographs and spatially - analytical methods. Each photograph has been georeferenced and classified manually into several categories based on the tree density. Three spatial models that applied different population growth equations and seed diffusion from the near neighbourhood has been developed. All models were able to predict spatial distribution of trees with solid accuracy, however, predictability were decreasing with time. The best results corresponded with 40% agreement on average from all years and more than 50% for some individual years. Keywords: spontaneous succession, spatial models, post-mining sites
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Mapping of biomass flows in a selected region using GIS
Stráník, Vojtěch ; Matějíček, Luboš (advisor) ; Brůna, Josef (referee)
This literal review provides a summary of available instruments used for plannig waste collection comming from urban green mainintence. At first it describes methods of remote sensing suitable for mapping urban green areas, then various technologies applied for estimation of biomass production at this places. Solutions of waste collection comes from several papers, that tried to solve this problem using geographic information system (GIS). The following chapter evaluates different features of this waste in purpose of its next use. The last part compares theoretical knowledge, with how it works in real life. Key words: urban green, remote sensing, geographic information system, waste collection
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The effectt of shrubs on establishment of woody plant species in grazed landscape
Wiesner, Pavel ; Vojta, Jaroslav (advisor) ; Brůna, Josef (referee)
My bachelor thesis is concerned about mechanisms that influence establishment and growth of woody plant species under grazing pressure in the temperate climate region. Based on literature sources it determines and explains individual mechanisms and attempts to merge them into a holistic view of the issues of reproduction, propagation and survival of trees and shrubs in the grazed landscape. In general, grazing affects the course of natural succession and under certain conditions helps to maintain shifting landscape mosaics. In addition, the effects of grazing are retroactively modified by the already existing vegetation mosaics. In this regard, existence of shrubs providing protection to seedlings and saplings against bad environmental conditions and against grazing pressure is important, as they help to change spatial heterogenity of vegetation and to establish the shifting mosaics mentioned above. As the spatial heterogenity and total diversity of vegetation can increase or decrease under influences of many factors, the bachelor thesis also pursues the importance of spatial distribution and intensity of grazing, different commonly grazed species and usual systems of grazing management. Keywords: grazing, associational resistance, cyclic succession, wood-pastures, spatial heterogenity of...
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Mapping of the Litavka catchment using GPS
Hojcsková, Daniela ; Matějíček, Luboš (advisor) ; Brůna, Josef (referee)
This thesis is aimed on the study of Global Positioning System (GPS) and its utilization possibilities in nature sciences such as ecology, hydrology, botany and the others. The main contribution of this work is the investigation of current possibilities of the most accurate data collection by using GPS and their subsequent processing in GIS with focus on small catchment. Other methods of terrain data collection are described and compared with GPS in this work, as well. Practical part of the thesis focuses on characteristics of the locality, technical equipment and data editing gained in terrain. The study locality is the Litavka catchment, which is situated in Brdy. The geographical ground data, were gained from ZABAGED and were completed with results of own measuring in terrain. The output of the thesis is the digital terrain model of upper stream of the Litavka River modified by interpolation. Key words: GPS, DTM, GIS, mapping, catchment, Litavka, interpolation
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Historical development of spontaneous vegetation in post mining landscape near Sokolov
Vávrová, Alena ; Frouz, Jan (advisor) ; Brůna, Josef (referee)
Absract This study aims to assess the development of spontaneous succession on non reclaimed land on the example of Velká podkrušnohorská výsypka. Work was based on aerial photographs of dumps from the past 20 years, which were purchased from the Military Geographical and Hydrometeorology Office in Dobruška. Photos from various years were scanned, rectified and then elaborated in a GIS program. On the slides were set non reclaimed spoil area, which will be studied on the development of spontaneous vegetation. Results show considerable diversity in the speed at ingrowth areas different years in different places of dump. Can be estimated that in 20 years could spontaneously close up 30-70% space of dump, if was all left to spontaneous dvelopment. Keywords: succession, reclamation, GIS, coal mining, postmining landscape
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Modelling of land cover change in abandoned landscape using time series of aerial photography
Brůna, Josef ; Jačková, Kateřina (referee) ; Vojta, Jaroslav (advisor)
Obsah 5 English abstract This thesis deals with modelling of land cover change in abandoned landscape. The study site is located in the military area Hradiště, around the former village Tocov, it is 2,5 km long and 2 km wide. Due to lack of historical vegetation data on landscape scale, historical aerial photographs were used as a primary source of data. They were orthorectified, mosaicked and automatically object oriented then classified in two categories woodland and grassland. Changes between two successive classified images were modelled with generalized linear models with mixed effects (lmer). Variables that were derived from digital elevation model, former land use and spatial variables computed with algorithms based on cellular automata were used. In order to verify the model predictions with the actual situation and for easier interpretation and visualization of results, a new application PEMZOK (Spatially explicit model of overgrowth of abandoned landscape) was developed and is one of the results of this work. Rapid rate of overgrowth of remaining grasslands was found. The largest observed effect on the spread of trees had the distance to the nearest tree or shrub and density of trees in the vicinity (15 m × 15 m) and the wider neighbourhood (105 m × 105 m). Models with these variables and land use...
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The history and benefits of CT as an examination method
Melicharová, Ivana ; Adla, Theodor (referee) ; Bruna, Josef (advisor)
Historical development and contribution ct as investigative method My baccalaureate work is divided to the several part. At the beginning I'm deal with case - history computed tomography, where I'm mention names of physicists that the about discovery tomography deserved. Further I'm described structure computed tomograph, which to be almost near of all apparatus the same, only happens to perfection. It is perceptible near characterization separate generations CT apparatus, step by step escalate numbers of detectors and investigation happen for patients more convenient and thrifty in taken radiation dose. To investigation computed tomography is necessary application contrast medium, described an forms version, type contrast medium and their function. Work finishes summary of radiation empty weight for patients, scope of employment radiological assistant in the workplace of computer tomography and it's round off characterization computed tomography with dual energy of radiation. Powered by TCPDF (www.tcpdf.org)
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