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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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Hydrological extremes from the viewpoint of public administration and the public in the Czech Republic
Hyrčová, Lucie ; Štibinger, Jakub (advisor) ; Hrabalíková, Michaela (referee)
The Diploma thesis deals with the topic of hydrological extremes from a public administration and a general public point of view. The literary researches defines present manners of economy process with rainwater in urbanised and open landscape. This part focuses on extreme phenomena and their characteristics in case of floods and droughts in Czech Republic. The thesis also mentions causes of unsustainability of current methods of drainage and talks about the legislation that regulates management of rainwater. It also provides description of multiple variants of regulatory water management measures aimed at rainwater retention and infiltration in urbanized areas.
The practical part is focused on the survey (using a questionnaire) of perception of rainwater management and extreme hydrological phenomena by public administration and the general public in the Czech Republic.
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Measurement rainfall kinetic energy using laser disdrometer
Jelínková, Petra ; Petrů, Jan (advisor) ; Hrabalíková, Michaela (referee)
The issue of water erosion is spread all over the world. It is closely related with soil aggregates breaking up and the subsequent soil nutrients loss. The total and intensity of rain are important parameters for determining the kinetic energy of rain. The measurement of rain characteristics was done in the laboratory at Czech University of Life Sciences Prague. To obtain the data rain simulator and laser disdrometer were used. With its help the intensity, volume, spectrum, even size and falling velocity of rain was found out. Overall 90 measurements were taken which describe the simulated rain characteristics in detail. Each measurement took 5 minutes. The kinetic energy was found out from the size of raindrop and its falling velocity. The average intensity of rain was 58.6 mm/h and reached KEtime 706,6 J m2/h. The droplets diameter median of all measurements was set in range of 0.375 to 0.5 mm.
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