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Erosion protection of slopes from assignment to implementation
Konopecká, Vladislava ; Janeček, Miloslav (advisor) ; Kalibová, Jana (referee)
The thesis is following up on the findings to the issues presented in the Bachelor's thesis, where they were described mainly the methods and materials used to secure the slopes of pipeline, will address not only the final solution method of protection against erosion of the slopes, but in particular all conditioning influences such as the topography, the type and quality of rock and soil in the area of the building, surrounding buildings, and last but not least property relations that can significantly affect the design solution in terms of difficulty of implementation, durability, aesthetics and economic performance of the resulting construction works. Alpha-Omega of the initial phase is the analysis and the interdependence of the issues just for land consolidation, anti-erosion measures, construction procedures in accordance with the geology of the chosen territory and the intended realization of the construction project. The evaluation of the risks associated with this issue on the basis of field investigation, examination with a valid legal legislation, SWOT analysis will be ended.
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Research of windbreaks in a chosen cadastral area from the point of view of woody plants species´ representation and their health condition
Knoblochová, Martina ; Janeček, Miloslav (advisor) ; David, David (referee)
This thesis evaluates the current state of selected wind breaking types, looking at their species composition, condition and functionality.
One of the most efficient precaution against wind erosion are wind breaking swathes of woodland, windbreakers. These woodlands protect adjoining land against wind erosion of topsoil, blowing away snow cover as well as lowering water evaporation. The right position in the landscape, species composition and a good state are important for windbreakers to fulfil the above mentioned function. In the Czech Republic, 29% of farmland is badly affected by wind erosion. The most affected areas are situated in the South Moravian region. For the purpose of this dissertation work, two areas were chosen. Both of them are situated in the district of Znojmo, where the highest level of wind erosion is found. Area 1 lies in the districts of Břežany, Čejkovice and Božice. Area 2 lies in the districts of Velký Karlov, Hrádek and Křídlůvky. In order to investigate suitability of current windbreakers, the state of potential natural vegetation, climate, geological, paedological and hydrological conditions will be investigated in both of these areas.
For the assessment of the effect of windbreakers, methodology after Podhrázská (2008) was used. This methodology allows assessment of these trees as individual linear elements, but also as a part of a network of these elements. The assessed criteria will be, for example: position in the landscape, species composition, age, functional type, height, width and the number of rows. Furthermore, horizontal and vertical parameters will also be investigated. For the evaluation of the functionality of the network of elements, it is also crucial to look at the tree orientation, their position in relation to the terrain and the direction of the wind. Moreover, the distance between individual woodlands also plays a significant role. The effect of windbreakers on the landscape will be further assessed using classification system after Kolařík (2005).
Over the course of this project, 22 windbreakers were selected for evaluating their functionality and a proposal for their re-establishment in the future was suggested.
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Contribution to the evaluation of different approaches to the modelling of soil loss by water erosion in GIS
Hrabalíková, Michaela ; Janeček, Miloslav (advisor) ; Jan, Jan (referee)
Dissertation thesis: Contribution to the evaluation of different approaches to the modelling of soil loss by water erosion in GIS, is a set of five studies published or accepted for publication in scientific journals. Thematically the work deals with the question of linking the erosion modelling together with geographic information systems. The work is divided into five chapters. In the first chapter, the issue of erosion and rainfall-runoff modelling is described. A particular focus is placed on the concept and the basic equations underlying erosion modelling. The second chapter contains 2 studies that deal with modelling rainfall-runoff conditions in the area of experimental area using KINFIL model. The chapter also discusses the selection of a suitable model and source datasets that forms the basis for the evaluation of physiographic parameters of a catchment. The third chapter is thematically focused in calculating the rainfall factor based on long-term precipitation records from 32 meteorological stations in the Czech Republic. It partially overlaps with the previous chapter because one of the outcomes of the study is the REDES database containing values of R-factor. However, the chapter focuses more on the time scale, and especially the influence of the time step in the simulation on resulting outcomes of the model. The fourth chapter is dealing by erosion modelling in GIS based on analysis of digital terrain models. It contains a study that addresses the influence of various algorithms and/or equations to calculate topographical factor and its effect on the overall prediction of soil loss.
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