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Applicability of distance data for hydromorphological assessment on the example of Elbe river
Vacková, Tereza ; Langhammer, Jakub (advisor) ; Hartvich, Filip (referee)
The aim of this thesis is to evaluate the applicability of distance data for hydromorphological assessment. Background research is focused on different types of distance data sources and selected hydromorphological methods. Applicability of distance data in hydromorphological assessment was tested on four selected sections of Elbe River, on which there was previously conducted field survey. Hydromorphological assessment was based on methodology HEM (Hydroecological monitoring). Results from the field survey were used as a reference resources for comparison with the own results achieved by the assessment with distance data using public available data sources. The results indicated that use of distance data for hydromorphological assessment can be regarded as an alternative to the field survey. At the same time the study pointed to clear limitations in assessment of some parameters, namely of river bottom, where the field survey cannot be replaced by any known distance data source. The results proved that the application of distance data can lead to the results comparable to the field survey while respecting uncertainty, given by impossibility to determine some of the parameters.
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Simulation of particle transport in inclined pipeline by using combination of CFD and DEM
Mildner, Michael ; Konfršt, Jiří ; Kysela, Bohuš ; Chára, Zdeněk ; Vlasák, Pavel
Numerical flow simulation of scattered coarse-grained suspensions (hydrotransport, separators, etc.) requires the use of calculations for multiphase flow. Assuming the suspension flow (eg. water and solid particles) in closed profiles without air access, the task can be simplified to a two-phase flow (water-solid particles). A suitable tool for calculating such two-phase flow is the combination of the finite volume method FVM, with the discrete element method DEM. The discrete element method is used to solve collisions between individual particles, which is a prerequisite for a real solution of more concentrated suspension flow. Numerical simulation was performed on a simple geometry of inclined pipeline, where the obtained results were compared with the results obtained on the experimental slurry transport route equipped with a foldable part.
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Detection of Terrain Skeleton Lines based on Laser Scanning Data
Jaroš, Jakub ; Lysák, Jakub (advisor) ; Bayer, Tomáš (referee)
The objective of the thesis is to design a new detection method of terrain skeleton lines from airborne laser scanning data. The theoretical part provides a brief introduction to airborne laser scanning issue. There are presented major principles of the technology and procedures applied to create digital terrain model from laser data. There is also described an application of airborne laser scanning in the area of the Czech Republic in detail and follows an exact specification of key terms of the thesis. From the geomorphology, topography and geoinformatics point of view there are defined especially terms like terrain skeleton lines, breakline, valley and ridge. Literary research consists of the summary of already published method of breakline detection. There are algorithms focused on data processing in form of original point cloud as well as algorithms focused on processing data in the raster form. Primary goal of the theoretical part is to express major principles of already published method of detection. The practical part firstly introduces data that are used further in the thesis. The objective of the thesis is a description of a new method of detection of terrain skeleton lines. The method processes laser data converted into raster form and it is based on the analysis of transverse elevation profile...
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Fotogrammetric analyses of aerial pictures of mountain landscape and generation of DEM
Hynštová, Marie ; Stuchlík, Evžen (advisor) ; Matějíček, Luboš (referee)
This thesis describes the stereo photogrammetric method used for digitalization of terrain elevation data of choosen area and the applications of digital elevation model (DEM). The main part of the thesis consists of DEM generation methodology, including stereo photogrammetric evaluation of aerial pictures, quality control of evaluating process, DEM creation and revision. DEM was created in software Edras Imagine 8.6. The thesis results in detailed description of DEM creation in the high mountain terrain selected in the High Tatra Mountains. Grid DEM of cell size 1x1 meter is attached. Key words: mountain lakes and catchments, photogrammetry, aerial pictures, DEM
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Operating Data in TerraGear GIS Project
Samia, Michel ; Herout, Adam (referee) ; Hrubý, Martin (advisor)
This thesis is concerned with design and implementation of system for providing, loading and viewing geographical data from TerraGear GIS project with taking advance of SimGear library. System accesses digital terrain model and land cover data saved in Binary TerraGear file format via simple application protocol above TCP/IP and views it by FreeGLUT library.
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Track's Elevation Profile View on a Public GIS
Doubal, Štěpán ; Šilhavá, Jana (referee) ; Fapšo, Michal (advisor)
This bachelor's thesis describes the design and implementation of a user script for GreaseMonkey (plug-in for Firefox). This script adds a functionality to show height profile of a defined route. The route is defined using public GIS tools from www.mapy.cz. The script extracts coordinates from page DOM structure, processes it and draws a height graph. The graph is created using http://www.heywhatsthat.com/profiler.html [2] or www.profile.hy.cz, which provides height graph drawing using www.vyskopis.cz JavaScript API [4].
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Zpracování a interpretace výnosových map jako podklad pro agronomické rozhodování
Širůček, Petr
Diploma thesis was focused on data yield map processing, their interpretation and analysis of relations with another spatial data. Aims of the work were identification error values, statistical process yield data and with help statistical methods evaluate correlation between yield map and another spatial data. Methods were based on gathering yield data with combine harvester during two years in corn and malting barley in conditions of farm. With using GIS and predefined tolls were removed error values from yield data and created yield maps. Subsequently, yield maps were analyzed with vegetation index NDVI, digital elevation model (DEM), sensor measurements of soil electrical conductivity and historical yield maps. In results was achieved removing from 11,3 to 13,8 % yield points in average, increasing of average yield from 3,6 to 4,7 % and decreasing of variation coefficient between 7,0 and 8,6 % with comparing original yield data and depending on planting crops during data yield processing. In case of evaluation of relations between yield map and NDVI obtained from satellite remote sensing was achieved moderately correlation by corn (r = 0,44) and malting barley (r = 0,65) in average depending on times of imaging and vegetative phase of the crop. In the evaluation relations between yield maps and DEM and slope was achieved weak and very weak direct and indirect correlation. Likewise, by soil electrical conductivity and yield was achieved very weak to negligible correlation. Conversely, the highest correlation was achieved between yield map and historical yield map (r = 0,63) in average. Obtained information serve as starting point for making agronomy decisions in conditions of particular farm in case of replacement of creating yield maps by prediction of yield based on another spatial data.
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Mathematical Modeling of the Movement of the Solid Phase using Software LIGGGHTS
Jirounková, K. ; Havlica, Jaromír ; Kohout, M.
The main aim of this work was using the open-source software LIGGGHTS for desribing the solid phase behaviour. This software package is based on the discrete element method (DEM), where every particle consists of an asseblies of spheric particles. Each of these particles is linked to the others and their move is characterised by their ceter of gravity. There were described the basic examples by using softwarepackage LIGGGHTS; such as creating the granular layer and its mixing by using different types of the stirrer.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22014022814090 - PDF
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