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Hydrological drought on the Lužnice River in 2018
Junková, Anna ; Šobr, Miroslav (advisor) ; Matoušková, Milada (referee)
This bachelor's thesis elaborates on hydrological draught on Lužnice river at 2018. First part is focused on literary research on draught types, causes and impacts. Following chapter evaluates hydrological draught in Czechia between 2014 and 2018. This research serves as a resource for the main part of the thesis, which deals with hydrological draught on Lužnice river at 2018. Computations are based on threshold level concept and deficit volumes methods. Analysis is performed on the basis of data series from limnigraphic stations Pilař and Bechyně. These profiles are compared for the purpose of determining differences. The results of the work show that the hydrological year 2018 on Lužnice river was very important year in modern history in terms of drought. Key words: hydrological drought 2018, deficit volumes, threshold level, 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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Flood protection and flood plans on selected basin of the Lužnice river
KUKAČKOVÁ, Lucie
The thesis consists of two parts - the theoretical outline and the research. The theoretical section describes in general the topic of floods, protection of the population against floods, flood control measures, flood plans and legislation related to floods. The last chapter of the theoretical section is focused specifically on the Lužnice river and the affected municipalities, in which qualitative research took place. These are the villages of Vlkov, Veselí nad Lužnicí, Dráchov and Soběslav. In order to fulfil the aim of this thesis, it was necessary to acquire not only flood plans of the affected municipalities, but also other non-public documents, and to thoroughly analyze and compare them with each other. Based on this analysis and comparison, information was compiled concerning flood protection measures in the municipalities, where the investigation took place. This comprehensive information is presented in chapter 'Results'. During the qualitative research, several errors and shortcomings were uncovered in the flood plans of municipalities in the Lužnice river basin. Shortcomings were discovered mainly in the continuity of flood plans and in the absence of endangered objects, which should be listed in flood plans. These objects pose anthropogenic risks to municipalities. Others shortcomings were found in food plans updates. These updates should be performed regulary but this is not happen in practice. For example food plan of the village Vlkov is 22 years old and has been update only once. During the examination of the official websites of the municipalities, other shortcomings were found in the information available to the population. The actual investigation and analysis of the flood plans provided an answer to the research question. Individual flood plans and flood control measures are not in concord.
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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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Influence of groundwater on hydrologic drought in the Lužnice River floodplain
Korejs, Tomáš ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
The object of this thesis is to evaluate influence of groundwater on the period of hydrological drought in the Lužnice river floodplain, focusing on interaction between surface water and groudwater. Floodplain of the Lužnice is unique fluvial ecosystem characterized it's diversity and natural value. Especially upper stream of Lužnice represents river floodplain river and creater good conditions for water retention. Main first part of this thesis is focused on work with literature about issue interaction between surface water and groundwater in the river floodplain with examples from Czech republic and the world, including the characteristics the groundwater Work with literature is also focused at characterizing the types of drought, it's cause and consequences. The second part evaluates the basic characteristics of runoff and hydrological drought on the Lužnice. This analysis is based on statistical evaluation of longtime data series from Pilař and Bechyně stations. Both profiles are compared to identify correlations.
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Development of fluvial lakes in the Lužnice River floodplain
Hastíková, Petra ; Šobr, Miroslav (advisor) ; Havlíková, Petra (referee)
The object of the thesis is to evaluate the development of several chosen fluvial lakes in the basin of the river Lužnice, mainly in the section between the border with Austria and Suchdol nad Lužnicí. The river Lužnice in this particular section represents low intensity of modification. Many fluvial lakes are situated there and the river is meandering remarkably in the area. The first part of the thesis deals with the characteristics of the natural conditions in the basin of Lužnice and the defined floodplain and the problematics of lakes and their determination. The main part of the thesis focuses on the evaluation of the flow development and fluvial lakes of the Lužnice floodplain based on the data of a aerosnapshoting. Because of the gradual decease of the meanders and straightening of the flows, it is possible to claim that the river has been considerably shortened with the passing time. In the thesis, 34 chosen fluvial lakes, that were measured morphometrically and batymetrically, were studied in detail.
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Hydrological drought on the Lužnice River in 2018
Junková, Anna ; Šobr, Miroslav (advisor) ; Matoušková, Milada (referee)
This bachelor's thesis elaborates on hydrological draught on Lužnice river at 2018. First part is focused on literary research on draught types, causes and impacts. Following chapter evaluates hydrological draught in Czechia between 2014 and 2018. This research serves as a resource for the main part of the thesis, which deals with hydrological draught on Lužnice river at 2018. Computations are based on threshold level concept and deficit volumes methods. Analysis is performed on the basis of data series from limnigraphic stations Pilař and Bechyně. These profiles are compared for the purpose of determining differences. The results of the work show that the hydrological year 2018 on Lužnice river was very important year in modern history in terms of drought. Key words: hydrological drought 2018, deficit volumes, threshold level, Lužnice river
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Causation of develpment change of selected fluvial lakes of Lužnice River in profile Základna
Jaček, Matouš ; Šobr, Miroslav (advisor) ; Havlíková, Petra (referee)
The aim of this thesis is to evaluate developement of selected lakes in area Základna in upper Lužnice basin. The area of interest is located in nature reservation Horní Lužnice, which extends from state border with Austria to Suchdol nad Lužnicí. This part of the river is very preserved almost without any anthropogenic influence. Eventhough it is the middle part of the river, it has developed floodplain with meandering belt, which is typical for lower parts of rivers. Because of its conditions, this area is very convenient for observing natural spills and studying fluvial lakes, which occure here in huge amount. First part of this work describes characteristic of the study area, fluvial lakes and natural spills and floods in the area. The main second part focuses on research of selected lakes and their developement. During several field researches the lakes were mapped and measured and soil samples were taken from the lake beds. Furthermore flow in floodplain during river spill was measured and data from automatic surface level sensors were evaluated, which show mutual connections of fluctuations of the lakes and the river. In conclusion the results of measurement were compared with previous theses regarding this area. Main results are that common spills cause clogging of lakes but intense floods...
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Influence of groundwater on hydrologic drought in the Lužnice River floodplain
Korejs, Tomáš ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
The object of this thesis is to evaluate influence of groundwater on the period of hydrological drought in the Lužnice river floodplain, focusing on interaction between surface water and groudwater. Floodplain of the Lužnice is unique fluvial ecosystem characterized it's diversity and natural value. Especially upper stream of Lužnice represents river floodplain river and creater good conditions for water retention. Main first part of this thesis is focused on work with literature about issue interaction between surface water and groundwater in the river floodplain with examples from Czech republic and the world, including the characteristics the groundwater Work with literature is also focused at characterizing the types of drought, it's cause and consequences. The second part evaluates the basic characteristics of runoff and hydrological drought on the Lužnice. This analysis is based on statistical evaluation of longtime data series from Pilař and Bechyně stations. Both profiles are compared to identify correlations.
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