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Reaction of surface water and groundwater to the hydrological drought in 2015-2018 in the Upper Lužnice river
Husarik, Pavel ; Burian, Alois (advisor) ; Šobr, Miroslav (referee)
The Bachelor's thesis focuses on the examination of drought as an extreme and complex phenomenon. It provides a clear overview of its types, causes, and impacts on the landscape and society. Furthermore, it discusses the response of surface and groundwater to dry periods. The theoretical conclusion specifically analyzes the period of hydrological drought in the Czech Republic between 2015 and 2018. In the practical part, the characteristics of monthly and annual discharges are evaluated, and the response of surface and groundwater is assessed using data. Data from both surface and groundwater, as well as precipitation totals from the ČHMÚ (Czech Hydrometeorological Institute) observation network, were utilized. Average precipitation totals were also taken into account. The evaluation of time series was performed in terms of precipitation-runoff regime, including exceedance lines and monthly flow distributions. The results indicated that the lowest average flows were recorded in 2018, which also saw the lowest average groundwater level. Conversely, the highest number of dry days occurred in the studied period in 2015. Keywords: surface water, groundwater, hydrological drought, the upper Lužnice river
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Hydrological drought in 2022: Case study of the Lužnice River and Bouřlivec River Basins
Hajný, Vojtěch ; Šobr, Miroslav (advisor) ; Burian, Alois (referee)
This bachelor thesis is focused on evaluating the issue of hydrological drought on Lužnice River and Bouřlivec River Basins in 2022. The first part of the thesis is focused on solving the topic of drought, its classification and causes. The next part of the work deals with a general assessment of the hydrological drought in Europe in 2022, its impacts in specific countries and the indicators used to measure it. The practical part is a key part, dealing with the evaluation of hydrological drought in the areas of interest in 2022 using the threshold level concept, deficit volumes and drought indices. The analysis is carried out on the basis of the provided flow data from the Pilař and Bechyně profiles in Lužnice River and Lahošť and Duchcov in the Bouřlivec basin. Based on the resulting values, the year 2022 is compared with previous years and placed in the context of long-term drought observation. The results show that the drought in 2022 was severe but not very ignificant in the long-term monitoring. In terms of the number of dry days and insufficient volumes, the hydrological drought in the Bouřlivec basin was more pronounced than in Lužnice River, where it was accompanied by lower flows. Key words: hydrological drought, Lužnice River, Bouřlivec River
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Hydrological drought and surface water quality as research education on grammar school
Janečková, Petra ; Matoušková, Milada (advisor) ; Matějček, Tomáš (referee)
The bachelor's thesis deals with the topics of hydrological drought and water quality in the school environment. The goal of the thesis is to create a worksheet using research-oriented teaching, on the above-mentioned topics. In the theoretical part, from the available professional and popular science sources, it characterizes both professional and didactic issues with the help of research. The theoretical part of the bachelor thesis serves as a basis for creating a worksheet. In the practical part, with the help of a worksheet, it increases students' awareness of hydrological drought and surface water quality. The conclusion of the thesis discusses the students' results from the worksheet. Key words research-oriented education, hydrological drought, surface water quality, worksheet
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Hydrological study of potential restoration of a defunct small water reservoir in the Ploučnice River basin within the elimination of hydrological drought impacts
Kočíb, Jiří ; Kocum, Jan (advisor) ; Janský, Bohumír (referee)
This diploma thesis is focused on the study of the potential restoration of small water reservoirs within the framework of eliminating the effects of hydrological drought. In the theoretical part of the thesis, it summarizes the current knowledge about small water reservoirs and ongoing climate changes. It also focuses on the possibilities of their revitalization as part of the contribution of this renewal to the landscape. At the same time, the work also provides insight into the detailed physical-geographic characteristics and focuses primarily on the hydrological and climatological view of the issue of revitalization. These introductory findings are transferred to the practical part of the work in which the author deals with a case study that should lead to concrete steps to successfully complete the work plan. A comparison of the methods of measuring the contents and shorelines of individual reservoirs is also published in the results passage. The results of the work recommend the restoration of all reservoirs at selected locations and indicate possible further steps to deal with this result. Key words: climate change, water retention, small water reservoir, hydrological drought, Ploučnice river.
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Monitoring and warnings of hydrological drought in the world
Klečková, Hana ; Šobr, Miroslav (advisor) ; Pecha, Martin (referee)
This bachelor thesis analyzes the definition of hydrological drought and the definition of general drought. The introduction defines the main characteristics of meteorological, hydrological, agronomic and socio-economic droughts and their differences. Furthermore, it points out the causes and impacts of drought in different regions of the world from an economic, environmental and social view. The thesis also summarizes the recent hydrological drought in Czechia, which were the significant dry years 2015 and 2018. Additionaly, the thesis deals with drought in selected regions in the world and describes the most affected areas with drought and water scarcity. Large part is devoted to monitoring and warning systems of hydrological drought in the Czech Republic and in the world. Finally, the thesis explaines the differences between each hydrological model including HBV, VIC, LISFLOOD, Bilan, RAPID and mHM and describes different indexes like TSDI, DSCI, ODIB or CDI index. Keywords: hydrological drought, monitoring of drought, warning services
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Runoff régime focusing on hydrological drought in the catchment area of Liboc river
Juha, Ondřej ; Janský, Bohumír (advisor) ; Burian, Alois (referee)
Drought has been a hot topic for several years. Hydrological drought occurs primarily after the previous lack of rainfall. The basin of the Liboc River suffers from significant drought, mainly due to its location in the rain shadow of the Ore Mountains. The first part of the bachelor's thesis deals with literature research, which summarizes the physical-geographical characteristics of the area of interest. This is followed by a comprehensive research of current knowledge about drought and its types, causes and impacts. Furthermore, the precipitation-runoff process focused on local climatic conditions is described. The practical part consists of the own analysis of the obtained data using average daily flows. The dry days method and the insufficient volumes method were applied here. The period 2018-2020, when the drought was most pronounced, was selected for detailed analysis. Key words: runoff régime; hydrological drought; indicators of drought; deficit volumes; threshold limit method; impacts of hydrological drought; Liboc river
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Hydrological drought in the context of climatic change in the world and in the Czech part of Elbe River basin
Šachová, Barbora ; Kocum, Jan (advisor) ; Janský, Bohumír (referee)
Hydrological drought in the context of climatic changes in the world and in the Czech part of Elbe River basin Abstract The submitted thesis deals with the hydrological drought as one of extreme runoff situations in relation to climate change. Part of this work is a comprehensive research sources to Czech and foreign literature defining the concepts and the development of hydrological drought due to the physical- geographic and anthropogenic factors. Low flow characteristics and methods for defining the drought events are described. Attention is paid to the possibilities of prevention and compensation of negative impacts of drought. Within the second part the presence of low flow in Elbe River subbasins, Blšanka River, Rakovnický Brook and Vydra River, is analyzed. Water deficit is evaluated with regard to the physical-geographic characteristics and the specifics of water resources use. Outline of possibilities to increase the retention capacity of study catchments is given. Key words: hydrological drought, low flow, runoff regime, retention potential, Blšanka River, Rakovnický Brook, Vydra River
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Accumulation and retention reservoirs in Czechia
Leipeltová, Petra ; Kocum, Jan (advisor) ; Česák, Julius (referee)
This bachelor thesis is aimed in detail on small water reservoirs, on their distribution and function. Brief history of reservoirs is mentioned as well as their water management and technical solution. The part of the thesis is represented by the assessment of their influence and integration within an environment. In the second part, historical use and potential renovation of former accumulation reservoirs in Šumava Mts., situated in Vydra River basin and used for wood floating in the past, is solved. These water bodies are no more in function but their system could be an effective part of measures within an integrated flood protection and hydrological drought elimination. Geomorphologically suitable relief of Vydra River basin, source area of extreme runoff situations formation, also provides optimum conditions for realization of small retention reservoirs that could, in connection with other measures for headstream areas retention potential enhancement, reduce extreme runoff episodes in future. Keywords: small water reservoir, accumulation reservoir, retention reservoir, integrated flood protection, hydrological drought, Vydra River basin
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Interaction of groundwater and surface water under extreme hydrological conditions in the floodplain of the upper Lužnice river
Fialová, Petra ; Janský, Bohumír (advisor) ; Šobr, Miroslav (referee)
The object of this work is an analysis of the influence of extreme hydrological events (floods and droughts) in terms of interaction between groundwater and surface water in the river floodplain. The aim of this thesis is also the evaluation of the hydrological regime of the upper Lužnice basin and evidence of retention potential preserved natural floodplain. The selected objectives of the work were resolved on the basis of the values of groundwater levels and surface water in the area of interest. Based on data from underground wells and a digital terrain model, it was possible to create an image of the distribution of groundwater levels in river floodplains during selected hydrological situations. Data from surface flow was obtained from several habitats in the flow direction Lužnice. This has enabled graphically illustrate individual flood waves and characterize their size, speed and transformation after the passage of a preserved natural floodplain of Lužnice river. Carried out research has been confirmed retention capacity of the floodplain, which is most significant at flow rates slightly in excess of the flow capacity of the river bed. However, extreme floods or in periods with many culminations in a relatively short time leads to reduces water retention capability of the floodplain. In...
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Signs and impacts of hydrological drought in the Rakovnicky stream basin
Maroušková, Kateřina ; Matoušková, Milada (advisor) ; Hrdinka, Tomáš (referee)
This thesis deals with the signs and impacts of the hydrological drought in the Rakovnicky stream basin. Its aim is to evaluate trends of the selected hydroclimatic variables, to analyze drought periods and land cover changes as one of the factors influencing a runoff regime in the catchment. The main methods used for the long-term and seasonal trends are Man-Kendall test, IHA analysis, flow duration curves and mass curves. Dry periods are evaluated based on Streamflow drought index (SDI), Low Flow index and runoff Q95 exeedance. Land use changes are analyzed using historical maps and index of change. Basic indices of ecological stability are calculated. According to the results the frequency and intensity of the hydrological drought in the Rakovnicky stream basin is increasing. Although the amount of a rainfall is consistent, its distribution throughout the year is changing. In addition the constantly increasing temperature and land use changes cause a significant runoff decreasing. To improve a water retention capacity in the cathment, it would be convenient to apply adaptation measures in the river channels and floodplains. Key words: rainfall, runoff, drought, ecological status, Rakovnicky stream
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