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Hydrogeological aproaches as the tool for the mitigation of negative impact of climate change in water management: Evaluation of qualitative and quantitative aspects of managed aquifer recharge
Rozman, David ; Hrkal, Zbyněk (advisor) ; Rapantová, Naďa (referee) ; Pech, Pavel (referee)
The thesis adresses the issue of efficient use of groundwater resources under the ongoing climate change conditions, which results in reduced natural recharge of aquifers. It focuses on the assessment of qualitative and quantitative aspects of managed groundwater recharge. In addition to a review of the issues of artificial recharge, the thesis provides two outputs. The first one is a critical evaluation of the effectiveness of artificial infiltration in crystalline conditions, typical for a large part of the Czech Republic, where at present artificial infiltration is not a commonly applied procedure. The second key output is the monitoring of the occurrence of new types of micropollutants from the category of so-called emerging pollutants, which may limit the availability of drinking water sources, especially in periods of climatic stress. Research within the PhD project was conducted at several pilot sites and the results are published in peer-reviewed articles. The obtained findings confirm the suitability of the managed groundwater recharge procedure and the considerable effectiveness of attenuation processes of the aquifers in degrading micropollutant pollution.
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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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Bank infiltration in area of Jordán meander on Orlice river
Drmota, Adam ; Hrkal, Zbyněk (advisor) ; Slavík, Martin (referee)
This thesis deals with the study of the Jordán meander on the Orlice River, where the watercourse has undergone extensive revitalization in recent years, which after several decades returned the watercourse to its original riverbed. In connection with the revitalization of the watercourse, an increase in the level of groundwater in the surrounding quaternary aquifer was expected. In this case we can call it artificial bank infiltration. In order to confirm this assumption, hydrogeological boreholes HV1 to HV4 were placed at the site, and they were used for groundwater level monitoring since year 2018. The results of the monitoring document the positive impact of the revitalization on the level of groundwater in the surrounding river alluviums. Furthermore, it was found that boreholes on different banks of the Orlice River react to flow rates in the river and revitalization measures, quite differently. Differences can also be caused by orders of magnitude different hydraulic parameters on both banks, which have been verified using field pumping tests. Keywords: Bank infiltration, monitoring, pumping tests, revitalization
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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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Hydrogeology of Skorkov and Sojovice waterworks based on data from new water wells
Rybářová, Magdalena ; Bruthans, Jiří (advisor) ; Kůrková, Iva (referee)
The Riverbank Filtration (RBF) water supply system Karany has been affected by increasing NO3- concentrations during recent decades. This thesis deals with flow and chemical composition of groundwater in Skorkov and Sojovice RBF systems, which are the most problematic ones according to their quality in long term. Twelve new groundwater wells (V1- V12) were drilled in study area in 2013. Data derived from the wells were used to improve the conceptual hdrogeological model of the area and I tried to specify information about the origin of nitrate pollution. The Groundwater level logging showed hydraulic connection between the river and the wells situated up to 130 m faraway from the river (V1, V2 andV10), which were also demonstrated by the short- term temperature fluctuations caused by fast penetration of surface water from The Jizera River during higher flow rate to wells. I compiled geological sections which show the geometry of The Quaternary fluvial deposits and groundwater level. The chemical analysis of groundwater showed that it is not possible to differentiate groundwater from the shallow part of The Cretaceous aquifer from the aquifer of fluvial deposits by major chemical components. The result of infiltration experiments showed higher permeability in the environment with grass cover (kv=...
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