|
|
The nature of highly permeable flowpaths in the Turonian aquifers in the eastern part of the Bohemian Cretaceous Basin
Starý, Jiří ; Bruthans, Jiří (advisor) ; Datel, Josef (referee) ; Tesař, Miroslav (referee)
The thesis deals with the study of highly permeable porosity and the potential for karstification in the area of the East Bohemian Cretaceous synclines, which are of great importance for water supply. The susceptibility of the rocks to karstification was studied by taking cores and determination of their calcite content and by leaching the cores in 10 % HCl and monitoring of rock disintegration after leaching. A scanning electron microscopy and elemental mapping by microprobe were used to understand the structure and composition of the rock. The nature of the inflow zones to the boreholes was studied by evaluating available well logging data, particularly acoustic well logging, inflow data to the boreholes and by leaching rock samples from cores taken from the depth intervals where inflows occurred. A total of 247 cores taken from both boreholes and surface outcrops were studied. Only 5 % of the samples from the Turonian B, Ca, Cb aquifers that disintegrate from more than 50 % after leaching will form karst conduits in tectonically intact rock. This representation is much lower than in the Jizera Formation in the western part of the Bohemian Cretaceous Basin. Only a small fraction of the samples disintegrate if calcite content is below 78 %, the majority show no or very little disintegration. Only...
|
|
|
Character of groundwater flow in highly permeable sediments of Bohemian Cretaceous Basin
Kůrková, Iva ; Bruthans, Jiří (advisor) ; Datel, Josef (referee) ; Tesař, Miroslav (referee)
The study focuses on water flow in sandstones and sandy limestones of the so-called facies transition in the western part of the Bohemian Cretaceous Basin. The area between Turnov, Milovice, Úštěk and Doksy is a part of most important aquifer in the Czech Republic, in terms of water supply. However, there are considerable discrepancies in hydrogeological concepts regarding groundwater flow in this area. The prevailing opinion is that quartz sandstones form the main aquifer, although largest springs are partly located outside the area of their occurrence. The aim of the work is therefore to determine which rocks are the source of the large springs and where diffused seepage predominate. Furthermore, to characterize the possibility of rock karstification, to describe the character of the channels and the flow in them, and at the same time to compare it with the flow in the adjacent porous environment in selected areas. Thermometry (winter profiling of temperature and conductivity along watercourses) was carried out in order to distinguish areas with large springs, diffused seepage and stream segments without any drainage. The karst potential of rocks was determined using calcimetry and adopted leaching tests. To determine flow velocity in karst channels and to characterize the channels, a series of...
|
|
|
Geysers and their role in the groundwater regime
Pleskotová, Nikola ; Datel, Josef (advisor) ; Kubricht, Jiří (referee)
Geysers are unique and precious phenomenon in our planet. Especially hot geysers are originated only in localities where there are harmony of conditions, which are essential for their development. The main conditions are source of water, source of heat and unique system of rifts. Rifts bring the water to the chamber and vent ejects hot water to the surface. Most of cold geysers are drilled holes. Their vicinity are dappered by human, and they often look like fountains. In the introduciton of this bachelor thesis groundwater and it's movements and properties are presented. Additionally the rock environment and mineral water are covered. Geysers, the main topic of this thesis, are described as a seperate chapter. Different chapters explain how geysers work and other processes that accompany them.
|
|
| |
|
|
Natural groundwater seeps
Hanušová, Martina ; Datel, Josef (advisor) ; Lipanský, Tomáš (referee)
The bachelor thesis is built so that all chapters themselves freely followed up. The main pillar of work is first chapter, which deals generally with springs. Next follows typology of springs, which deals with different types of springs according to geology, temperature, and yield. The special part about artesian water follows. Next section deals with karst springs and thermal springs, where I present examples from the Czech Republic. The chapter of thermal springs includes also text about geysers. In the last part the thesis deals with the Mělník area and Mělnická Vrutice. The aim of this study was to document this issue, which appears in the literature. The main result of the thesis is gathering information that appear in the foreign literature only in parts, and almost never in the Czech books and papers.
|
|
| |
|
| |
|
|
Hypodermic and drainage runoff
Hubinger, Lukáš ; Datel, Josef (advisor) ; Vaněk, Jiří (referee)
The BSc thesis deals with hypodermic and drainage runoff, possibilities of its determination, with its place in the hydrologic cycle and impacts of anthropogenic activities. There are types of runoff, possibilities of its description one by one in the thesis. The thesis also includes information about agricultural drainage, its influence to the landscape as whole, types of drainage, about advantages and disadvantages of drainage systems and about actual situation of drainage systems in the Czech Republic. There are description in detail pluses and negatives drainage runoff in the thesis, there are description possibilities of its modernization, about actual situation of drainage systems and it is influence to the landscape.
|
|
| |
|
| |
guest ::
