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Measurement and modelling of the seepage between river and fluvial sediments
Bašus, Jan ; Bruthans, Jiří (advisor) ; Pastuszek, František (referee)
EN This diploma thesis deals with the measurement of seepage between the river and fluvial sediments using seepage meters. Although this is not a new method, it has never been widely used to measure seepage in our country. The Morava River and its side channels (Malá Voda and Mlýnský potok) in the Litovelské Pomoraví region were chosen as the test location for this measurement. In this locality, conflict of interests between groundwater extraction and the protection of the of floodplain forests habitat has been ongoing for a long time. Data of the seepage intensity would be very helpful for the overall understanding of the groundwater flow and influence of water from rivers in this territory. The work also includes a numerical model of groundwater flow, which was used to verify the measured seepage values. Due to the overall complexity of the geological structure and groundwater flow, the model includes a wide area around the site of interest. In addition to the scope of the work, two more control measurement campaigns were carried out to verify the overall functionality of the devices. First of them took place on the Morava River near Kojetín, on the occasion of a pumping test carried out as part of the VUV TGM project. The bottom of the river is at a depth of 3.5 m below the surface, the aim of...
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Methods to characterize the intensity of recharge via riverbed due to groundwater abstraction
Bašus, Jan ; Bruthans, Jiří (advisor) ; Kůrková, Iva (referee)
EN There is an intense exchange of water between the quaternary fluvial sediments and river. Although the precise amount of seepage flow is needed for various hydrogeological models and calculations, the systematic measurements of the seepage flux in our country are lacking. This Batchelor thesis describes 4 methods that can be used to measure the intensity of water exchange between quaternary sediments and river flows. These are manual and automatic seepage meters, which isolate a small part of the river bed and measure the amount of water that is lost or gained. These two approaches differ by frequency of measuremens. Secondly, there are methods that measure the temperature distribution in the river bed with heat-sensitive electric sensors (point measurements) and light distraction in an optic fiber. The measured temperatures are used to simulate the water and heat flow in the river bad. At each of these methods, I described the method principle, the equipment used for measurement, the measurement methodology as well as examples of where were these methods already used. Discussion in the final part of the thesis contains comparison of the practical use of the mentioned methods. Key words: Seepage, Seepage meter, riverbed infiltration, water flow in riverbed.
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