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Siltation of the Jirkov and Křímov water reservoirs
Němečková, Pavla ; Šobr, Miroslav (advisor) ; Chalupová, Dagmar (referee)
This bachelor's thesis contains detailed physical and geographical characteristics of the area and the comparison of the bathymetric methods. In the practical part it is focused on water reservoirs Křímov and Jirkov, which were built in the 1950s and 1960s. The main goal is to find out current conditions of water reservoirs using Acoustic Doppler Current Profiler (ADCP) RiverSurveyor M9 on the float, which offers automatic data saving. The bathymetric maps are created in ArcGIS Pro 3.0.2 by processing the measured data from 2022 and using the Kriging interpolation method. The current volume is compared to data from digitalized historical maps. The difference between these data gives us the amount of sediments and also the change of volume in every depth level. The current volume of WR Křímov corresponds to 1.31 mil. m3 , there was 6.4% silting compared to operating regulations. The Jirkov water reservoir has a current volume of 1.95 million m3 , in comparison to the operating regulations, there was only 3% silting. Key words: WR Křímov - WR Jirkov - bathymetric mapping - siltation
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Hydrological and suspended load regime of the Odlezelské Lake
Hulec, Filip ; Šobr, Miroslav (advisor) ; Kliment, Zdeněk (referee)
The Odlezelské Lake is a natural, landslide-dammed lake in western Bohemia. Its lake basin is silting intensely and its volume decreases; it will be completely silted in the future. This work aims to evaluate the siltation of the lake primarily by evaluating the suspended load regime of its tributaries and comparison with data from bathymetric measurements. Within this work, data from the station network of the Department of Physical Geography of the Faculty of Science of the Charles University were used, which was statistically processed in order to describe the hydrological and suspended load regime. In addition, flow speeds in the inflow part of the lake were measured during two precipitation-runoff events using ADCP. The results show that most of the suspended load is transported during flood episodes, in contrast to the runoff, there is a significant interannual variability in the suspended load regime. Oppositely, the comparison of the suspended load regime and the bathymetric data proved as impossible due to a high sensitivity of the data.
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Siltation of the Újezd water reservoir
Kebertová, Daniela ; Šobr, Miroslav (advisor) ; Chalupová, Dagmar (referee)
This bachelor thesis focuses on the siltation of water bodies. In April 2020 the first accurate and detailed bathymetric survey of the Újezd water reservoir was conducted using an ADCP RiverSurveyor M9. The aim of the measurement was to determine volume of the reservoir after 39 years since its construction. The obtained data was processed in ArcMap 10.7.1 using the kriging method of interpolation. Based on it a new bathymetric map of current state of the reservoir was created. For the sake of understanding the causes of siltation, a complex physical-geographic characteristics of the upper stream basin of Bílina river, on which the Újezd water reservoir is situated, had been done. The river basin is fundamentally anthropogenically influenced by water supply system and mining activities. The volume of the reservoir at a water surface area of 117.20 ha was shown to be 4718364 m3 , 1.63% larger, compared to the values 4642640 m3 and 120.75 ha presented in the management manual for the waterwork. The volumes are comparable which indicates that there is no significant amount of siltation and the reservoir became a naturally functional and sustainable ecosystem.
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Siltation of the Kadaň water reservoir
Kuchynková, Jindřiška ; Šobr, Miroslav (advisor) ; Chalupová, Dagmar (referee)
The Kadaň water reservoir was built on the river Ohře in 1971. It is considered as a deepend river bed rather then the water reservoir . As with others water reservoirs, there continues to be happening an intense siltation with various types of sediments. This bachelor thesis aims to identify a current state and the change that has passed over the last 18 years and based on those obtained informations create a bathymetric map. The thesis is based on data from 1984, 2000 and my own field mapping in 2018. For measuring water depths I used a system RiverSurveyor. The data were processed in programs Microsoft Office Excel and ArcMap. For creating a bathymetric map I used a Kriging interpolation method. The results showed that compared to year 2000, the siltation has increased by 5%. Currently, the reservoir is silted by 47%. It is located in an area of 545 941 m2 and its volume amounts to 1 385 862 m3 . In 1972, when the reservoir was filled, it had a volume of 2 620 000 m3 . According to the results of measuerement we can conclude that over the last 46 years there has been created 1 234 138 m3 of sediments in the reservoir.
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