National Repository of Grey Literature 83 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Water retention in the Úhlavka catchment area
Lukášová, Karolína ; Janský, Bohumír (advisor) ; Matějček, Tomáš (referee)
Water retention in the landscape is a very current topic these days. Thanks to a warming climate, we have to deal with hydrological extremes, erosion, or accelerated water runoff. If we choose to improve the retention capacity of the landscape, we can help transform flood waves, slow down runoff, and mitigate soil water erosion. In the agricultural landscape, we solve the mentioned problems by combining near natural measures and technical measures. This master thesis focuses on water retention in the Úhlavka basin, which is located in western Bohemia and forms a tributary of the Mže River. In the theoretical part, the physical-geographic properties of the area of interest and the rainfall-runoff process are characterized. A literature research is also carried out regarding retention, its components, and the factors influencing it. Furthermore, the individual types of measures that can be used to improve the state of retention in the landscape are also listed. The practical part offers a process of choosing a specific area for proposals in the Úhlavka basin. The Olešná basin was chosen, where the majority of the land cover is agricultural and, thanks to its geomorphological properties, it was also included in the list of critical areas. Three grassed strips, a swale, and strips of crops rotation...
Water scarcity in the world and in the Czechia
Krištof, Petr ; Janský, Bohumír (advisor) ; Matějček, Tomáš (referee)
I used mainly research and compilation methods in the theoretical part of the bachelor thesis. The water scarcity is very actual issue in the era of climate change. Unfortunately, in my opinion it doesn't get that much attention in public space. The first part of thesis summarizes the causes and consequences of water scarcity, there are examples of bad water usage including ways of solution. The goal is popularize the topic of drought and water scarcity and help to implement these attractive topics to the school curriculum. The chapter about water scarcity in the Czechia is mainly focused on drought and measures to eliminate it. We have to realize, that our water comfort is not eternal. Episodes of drought are occured more frequently also in central Europe now. The practical part of thesis contains one-day lesson programme about water scarcity and hydrometeorological extremes for 8th - 9th grade of primary school. Key words: climate change, water scarcity in the world, water consumption, consequences of water scarcity, water scarcity in the Czechia, drought, measures
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.
Lima - The Problems of Metropolitan Growth
Rataj, Martin ; Janský, Bohumír (advisor) ; Ouředníček, Martin (referee) ; Kouba, Karel (referee)
The dissertation deals with the situation of the suburban settlements (barriadas or pueblos jóvenes) on the periphery of the Peruvian capital Lima in context with the growth of the metropolis, accompanied by a number of chronic problems including a high crime rate, unsatisfactory conditions of living and weak public administration. By means of a sociological survey, the dissertation seeks answers to the questions related to individual aspects of the life in barriadas, and subsequently interprets them with regard to the development in the recent decades and the available relevant literature. It tries to seek points of intersection between various phenomena and find their common context by bridging the specific viewpoints of sociology, urbanism, history and ecology. At the same time, it ponders - also with regard to the experience from other cities in the region - about the future prospects.
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
Hydrological regime of selected lakes in the High Tatra Mts.
Sankotová, Tereza ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
This diploma thesis deals with morphometric analysis and hydrological regime of Skalnaté pleso lake and Hincové Oká lakes, especially the lake level fluctuation, during the period 2011 - 2014. One of the tasks was the bathymetric mapping of observed locations. For Hincové Oká lakes was it the first mapping of bathymetry at all. The hydrological regime and lake level fluctuation regime of observed locations shows interesting differences from the other Tatra lakes whose hydrological regime is controlled by precipitation amounts. The annual culmination of Hincové Oká lakes (the largest lake) is shifted into the spring caused by melting snowpack. When there is no rainfall for a couple of days Skalnaté pleso lake often dries up, even during summer months, when levels of most Tatra lakes reach their maximum values. However summer drying is shortterm. Lake level fluctuation regime is very dynamic. After a strong rainfall event its level rises very steeply, up to 0,14 m per hour. Powered by TCPDF (
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
Water quality analysis in the Mastník catchment area
Mrkva, Luboš ; Janský, Bohumír (advisor) ; Chalupová, Dagmar (referee)
The quality of surface water in the Czech Republic has changed distinctly in two last decades. The pollution of important rivers has been reduced radically. Small rivers in agricultural areas, however, remain problematic. There is a long-term absence of information about such rivers concerning the purity of water. Mastník, which flows through the agricultural area of Central Bohemian Uplands and as a right-hand side tributary flow into the Vltava River, is one of those rivers. Quality circumstances in catchment area were analysed on the basis of data about the concentration of selected indicators, which come from three monitored profiles of the State public enterprise Povodí Vltavy. The present state of surface water quality was specified by means of ČSN 75 7221. Further, the development of quality was observed since 1995 and the reliance of the concentration on the flow or the season of the year was rated. All the data, which were acquired about anthropogenic and natural pollution of the river, are very important for precautions, which lead towards the improvement of quality of water in rivers. It was discovered that the precautions, which are made in catchment area lead to the improvement of the quality of water in Mastník. If the present state should be retained, the remediation of waste water must be...
Changes of rainfall-runoff regime in the Stropnice river-basin
Volková, Alena ; Šobr, Miroslav (advisor) ; Janský, Bohumír (referee)
This paper deals with the rainfall-runoff regime in the Stropnice river-basin and its development. The aim of this paper is to answer the question of‚were there any changes in the runoff regime during the period 1945 - 2009, and if so, were these changes conditioned by climate or were they caused by human interventions' (e. g. river network modification, changes of the land cover, drainage systems development etc.). The single-mass and double- mass curves were used as the primary methodology. The homogeneity of the time series of mean discharge, precipitation and air temperature were statistically tested using Mann-Whitney-Pettit test and Mann-Whitney test. The Mann-Whitney-Pettit test was performed using the programme AnClim (v5.012), which is freely available online, the Mann-Whitney test was performed using SPSS 15.0. Non-parametric Mann-Kendall test was used for the trend detection, performed in MULTMK/PARTMK by C. Libiseller and A. Grimvall, also freely available online. Some changes in the runoff regime were uncovered in the early 80s', when the runoff decreased, which also happened after 1988. During these periods almost no annual flood occured. The first decrease of the runoff was caused by a drier season in the 80s'. The second decrease after 1988 was probably caused by a build-up of the...

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