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Anthropogenic impact upon the Vydra River basin runoff regime
Ševčíková, Lenka ; Kocum, Jan (advisor) ; Janský, Bohumír (referee)
Submitted diploma thesis deals with an assessment of historical and present anthropogenic loading in the Vydra River basin and with an evaluation of human impact on its runoff regime. Further to the brief characterization of natural conditions, runoff regime in the studied basin is assessed using different statistical methods. Complex evaluation of each anthropogenic impact is supported by concrete case studies. Thesis is completed by the outline of future possible routing with respect to water retention in the Otava River headstream area. Powered by TCPDF (www.tcpdf.org)
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Water losses in the Loučenský brook and Bouřlivec basins and the possibilities of their reduction during the hydrological drought
Junková, Anna ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
This thesis deals with the problem of water losses in the Loučenský brook and Bouřlivec basins. It was written on the basis of a project for the state enterprise Povodí Ohře, which dealt with the management of these streams. Loučenský potok and Bouřlivec are the sources of water for the Všechlapy reservoir, which provides a number of functions in the reservoir surroundings. However, the Všechlapy reservoir has been threatened by hydrological drought in recent years. For this reason, it is necessary to determine the water losses in the basin and focus on possible methods to ensure that the reservoir has sufficient water levels to maintain all of its major functions. In the first part of the thesis, the theoretical background related to the issue is explained. In the practical part of the thesis, water losses in the basin are detected mainly on the basis of longitudinal profiling of flows and recorded water withdrawals. Flow measurements were carried out on a total of 43 profiles in five different hydrological conditions with a focus on the dry season. The results show that there is a need to look for reserves in two areas. Firstly, in the management of the ponds, where it appears that a significant amount of water is being lost throughout the basins, and secondly, in the small-scale users who draw...
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The development of water quality in the headwaters of Berounka River catchments area
Wild, Aleš ; Janský, Bohumír (advisor) ; Benešová, Libuše (referee)
The paper describes the development of water quality based on selected pollution indicators in the source catchments of the Berounka River (Mže catchment, Radbuza catchment, Úhlava catchment and Úslava catchment of selected sub-catchments) on profiles located above the water quality monitoring profile Bukovec on the Berounka River from 1981 to 2019. Furthermore, the flow dependence during the monitored period and from it the predominant type of pollution in the given catchment is determined on the basis of the course of regression curves and the value of the coefficient of determination R2 . Based on the average annual concentrations, the evolution of the given pollution indicators on selected profiles is described for the longest possible monitoring period for which water quality data are available. Their evolution within a calendar year can be determined when the flow rate is exceeded. By means of mass transport, the actual amount of pollutants can be determined on the basis of the concentration and the flow rate. The specific mass transport then express the intensity of removal from an area of 1 km2 for a given time interval, which has been chosen here as well as the pollutant loads for one year. The observed results are then converted into graphical output. Based on the data, it is possible to...
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Hydrological drought in the context of climate change: Case study of the Blšanka and Loděnice basins
Burian, Alois ; Janský, Bohumír (advisor) ; Hanel, Martin (referee)
The final thesis deals with the issue of hydrological drought in the context of climate change. The basins of the Blšanka River and the Loděnice River have been suffering from water shortages in recent years, therefore they have been selected for the purposes of this final thesis. The thesis summarizes the basic principles used to estimate climate change on the water resources with emphasis on the occurrence of hydrological drought. At the same time, individual components and processes of hydrological modelling conditioning the formation of affected time series in the near (2020-2050) and far future (2070-2100) are described. A total of sixteen simulations created from the seven global climate models (GCM) of the CMIP5 project and three climate scenarios (RCP; Representative Concentration Pathways) are used. The time series of precipitation and air temperature, which have been influenced by the climate change, were derived by an advanced delta method that counts also with the change of variability. The conceptual hydrological model BILAN is used to simulate changes, due to its availability from the T. G. M. Research Institute of Water Management and its wide use in Czech conditions. The parameters of the BILAN model are calibrated based on the observed time series of both selected river basins....
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Small water reservoirs in the Krkonoše Mountains: What would their regeneration bring?
Šádková, Eva ; Janský, Bohumír (advisor) ; Daňhelka, Jan (referee)
This thesis deals with the evaluation of influence of small water reservoirs on the extreme runoff events (floods and drought) in the upper Úpa River basin. It summarizes knowledge about both hydrological extremes and their manifestations in the basin of interest as well as about small water reservoirs in the sense of water retention measures and their possible importance during the periods of low flows or floods. In this thesis two localities of possible reservoirs at place of former splash dams in Obří důl and on the Lysečinský Brook were chosen. To assess the influence of small water reservoirs on runoff during two chosen flood events and two periods of drought, the hydrological model HEC-HMS was applied. The results of model simulation proved a positive influence of reservoirs on the reduction of flood peaks (except for a concurrence of transformed flood waves in the outlet that occurred during one flood event), but the effect was decreasing with the increasing catchment area and the intensity of precipitation and with smaller storage capacity of a reservoir. During the low flows, a positive influence of reservoirs was observed as well, relating to the release of stored water. However, the ability of a reservoir to reduce deficit volume and to balance the flow was decreasing with smaller...
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Hydrological drought in the upper Mže catchment area
Lukášová, Karolína ; Janský, Bohumír (advisor) ; Šobr, Miroslav (referee)
Nowadays drought is a very actual topic. Hydrological drought is most often caused by a deficit of precipitation and it has been missing almost one year of rain in some areas in Czechia. This bachelor thesis focuses on the analysis of this type of drought in the upper Mže River basin, which is located in West Bohemia. In the basin there are these five gauging stations: VD Lučina and Stříbro on the Mže River, Planá on Hamerský brook, Třebel on Kosový brook and Stříbro on the Úhlavka River. The theoretical part defines the area of interest in terms of physiographic and runoff conditions. Furthermore, a research of the current knowledge about drought, its causes and impacts is performed. The practical part follows with the analysis, using data of the average daily discharges from gauging stations and two methods - threshold limit method and deficit volumes. Results are based on a mutual comparison of the stations and hydrological years. The biggest drought on the Mže River was registred in the period 1934-1935, since 1970s natural discharges were improved due to the built dam. The period 2018-2019 can be considered as driest years for the whole river basin. Key words: upper Mže River basin, hydrological drought, runoff, precipitation, physiographic conditions
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Development of water quality in the Berounka river catchment area
Wild, Aleš ; Janský, Bohumír (advisor) ; Matoušková, Milada (referee)
The aim of this thesis is to evaluate, describe and justify changes and development of water quality and selected indicators of pollution in the Berounka river basin. Part of the thesis is a review of the concept of water quality and analysis of obtained results. These dates come from the late 1960s to the present day. The basic statistical means will be used to analyze the basic concentrations of substances with the search for the biggest changes and differences during the monitored period. The measured results are then converted into maps or graphic outputs. Based on the data obtained, it is possible to create a longer-term picture of the water quality and its development in the Berounka river basin over the last 60 years. Key words: Berounka river, water quality, water régime, nitrate, organic substances, water pollution, water quality mapping
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