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Hydromorphological survey of the Bilina River
Kyselka, Jan ; Matoušková, Milada (advisor) ; Langhammer, Jakub (referee)
The main aim of this thesis is assessment and presentation of results of the hydromorphological survey of the Bílina river, which belongs to rivers with the biggest anthropogenic impact in the Czech Republic. The method Hydroecological monitoring (HEM, Langhammer, 2007) was used for the survey. This method is compatible with the Water Framework Directive 2000/60/EC. 53 parts of the river with the lenght 31,99 km were assessed. The thesis also includes assessement of the rainoff regime and information about protection of water ecosystems and sources in the Bílina river basin. Keywords: hydromorphology, HEM, Bílina river
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Analysis of landscape changes by means of GIS and RS in the upper Chomutovka River catchment
Stoupa, Svatopluk ; Jeníček, Michal (advisor) ; Langhammer, Jakub (referee)
This work assesses the suitability of selected tools of GIS and remote sensing for classification of black and white aerial photography to analyze changes in land cover in the basin of the upper Chomutovka. Area of interest is located in the highest parts of the Krušné hory mountains, which have historically been significantly affected by imission fallout that resulted in massive forest die-back. For the purpose of quantifying these changes, a series of aerial photographs from 1975 and 1987 were used as a source of data. Selected dates approximately define the interval of the largest forest dieback in the Krušné hory mountains and their comparison well illustrates the extent of this process. These images were combined and orthorectified and than classified by manual vectorization. For orthorectification and mosaicing OrthoEngine module of program Geomatica 10.0 was used. It turned out that due to the specific characteristics of historical aerial photographs resulting orthophoto can show the obvious shortcomings, especially the local deformations, which misrepresents the actual dimensions of landscape components and therefore it is not applicable for accurate classification. For this reason, the reverse process was chosen in which the images were firstly merged automatically in the program Hugin and...
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Analysis of flood events in the Upper Opava river source area
Lautnerová, Lucie ; Kliment, Zdeněk (advisor) ; Langhammer, Jakub (referee)
Present days are characterized by raising awareness of natural hazards, especially the risk of flood events. Extreme floods are connected with large - scale material damage and also endanger human lives. That's why the issue of flood formation and its possibility of forecasting has became disccused topic these days. Research of passed floods provides principles of effective flood protection in specific area. The main aim of this thesis is to analyse flood events that passed in the uper Opava river basin, concretely the source area containing the Černá, Střední and Bílá Opava river basins. This analysis refers about the flood frequency, different seasonal regime of floods occurence and looks for the relationship between atmospheric conditions and origin of flood events in the period of 1963 to 1997. Part of this thesis also summarizes main types of floods raised in the source area and compares different flood threat of the Černá, Střední and Bílá Opava rivers. There is also mentioned some basic differences of drainage formation, natural conditions and rainfall distribution in specific catchment area.
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Hydrological processes and dynamics in the changing climate and environment: Lessons learned from multiple temporal and spatial scales
Su, Ye ; Langhammer, Jakub (advisor) ; Hanel, Martin (referee) ; van Meerveld, Hilda (referee)
Hydrological processes and dynamics in the changing climate and environment: Lessons learned from multiple temporal and spatial scales Ye Su ABSTRACT Climate change, along with the changes in land use and land cover (LULC), is the key factor driving the changes in hydrological processes and dynamics in a basin. This thesis emphasized on understanding the impact of both long-term climate change and abrupt anthropogenic driven agricultural intensification or natural driven insect-induced forest disturbance on hydrological processes and dynamics at varying spatial and temporal scales in two diverting terrestrial environment. Two pattern-based investigations, one case study in a forest region in Central Europe and another in a semi-arid region in Central Asia, were aimed to answer the main research question "what are the responses of hydrological dynamics and the related hydro-geochemical conditions to climate change and certain changes in LULC at a basin-scale?". The long-term hydro-climatic dataset was used for conducting statistical analyses and establishing hydro-climatic modelling at the basin scale. We further conducted process-based studies, attempting to understand how and why the specific hydrological dynamics were altered at smaller spatial and temporal scales: (i) a catchment-scale tracer-based...
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Changes in extremity and seasonality of floods in the Zdobnice River basin
Čermák, Daniel ; Langhammer, Jakub (advisor) ; Šobr, Miroslav (referee)
The object of the bachelor thesis is to analyze the change of extremity and seasonality of floods in the Zdobnice basin. The literary research comprehensively presents floods with description of the biggest historical floods in the Czechia and in the Zdobnice basin. The literary research also includes the physical-geographical characteristic of the studied area. The practical part is based on the daily flow data analysis, obtained from CHMI (Czech Hydrometeorological Institute). Runoff analysis is performed on the base of these data, with focus on extreme flows. To compare the seasonality change, data series is divided into two periods (1945-1969 and 1970-2014), which point of change was determined by Pettit's and Buishand's homogeneity test. Seasonality change is compared by directional statistics, polar graphs, curves of cumulative frequency and flood index. As a result of these methods, it is found that in the second period, the flood risk is greater in earlier parts of the year. It has been also found, that there are more flood events in July. Key words: Floods, discharge, hydrological extremes, historical floods, seasonality, Zdobnice
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3D reconstruction of abandonned ponds using UAV photogrammetry
Stanovský, Tomáš ; Langhammer, Jakub (advisor) ; Blahůt, Jan (referee)
The main focus of the thesis is the reconstruction of 3D models and digital elevation models of five abandoned splash dams in Roklanský brook catchment using UAV photogrammetry methods. The aim of this work is to compare accuracy of the models with available conventional data sources and historical sources. Parallel topic is the research of accuracy of the models created through UAV methods and application of retention potential of small water reservoirs, in headwater areas. The images were taken with a drone-mounted camera. Modelling was done by processing images in software Agisoft PhotoScan through a workflow process, dense point cloud classification and subsequent DEM interpolation. Subsequent delineation of reservoirs retention space, altimetry correction and bathymetric analysis was performed in ArcMap over the interpolated DEM. The results and discussion point to the benefits and limitations of UAV methods, especially to altimetric accuracy of the resulting models relative to conventional DMR5G data and bathymetric characteristics derived from the models. Keywords: UAV; DEM; retention; GIS; model; pond
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Impact of climate change on runoff in montane catchments of Central Europe
Lörinc, Michal ; Langhammer, Jakub (advisor) ; Jeníček, Michal (referee)
The diploma thesis "Impact of climate change on runoff in montane catchments of Central Europe" aims to assess published scientific literature on the subject and to develop projections of changes in study catchments of Upper Vydra in Czechia and Kokra in Slovenia. The thesis contains a review of selected theoretical knowledge on climate change impacts, evaluates existing methodology of impact studies and presents projection results for two study catchments in its practical part. Those were acquired using a multi-step methodology by using climate model projections, bias correction methods, usage of hydrological model and analysis of variance. Among the main conclusions is the anticipated continuation of changes in seasonal runoff, decrease of summer runoff and increase in winter runoff, as well as changes in drought characteristics. The analysis of variance revealed a substantial influence of cliamte models on the achieved results, however selection of emission scenario plays a major role as well. It is apparent that the selected catchments do and will react to climate change differently, however both can be considered to be sensitive to these changes. Kľúčové slová: climate change, hydrological cycle, montane catchments, HBV Light, ANOVA
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