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Evaluation of runoff formation in catchment using stable isotopes 2H and 18O and water temperature
Hojovec, Daniel ; Vlček, Lukáš (advisor) ; Jeníček, Michal (referee)
The evaluation of the water regime of the springs, or the total runoff in small mountain catchments, is an important aspect in this work for understanding the functioning of the catchment from the point of view of the precipitation-runoff process, and above all for the verification or refutation of the various methods used to evaluate the runoff of the mountain catchment. For the stated purposes, between 2018 and 2020, repeated sampling was carried out from water courses, soil (shallow wells) and precipitation in the Rokytka catchment area. From the obtained data, the ratio of stable isotopes 2 H and 18 O was subsequently determined in the laboratory. We also worked with the data of stable isotopes 2H and 18O provided by the Department of Physical Geography and Geoecology of the Faculty of Natural Sciences of Charles University for the period 2014-2018. All data, together with hydro-meteorological data, were subjected to various analyzes and methods with the aim of evaluating the runoff. The core method of this work was hydrogram separation using a mixing equation working with stable 2 H isotopes and water temperature for 6 events. On the basis of the performed analyzes and hydrographic separations, it was found that the water in the Rokytka přítok during significant rainfall-runoff events is...
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Evaluation of spring discharge/temperature relation in Klatovsko region
HAVEL, Zdeněk
This work focuses on the evaluation of dependence between the spring discharge fluctuations and water temperature, both during the year and extreme rainfall-runoff events, on spring equipped with a V-notch weir with a continuous monitoring of spring water temperature and water level above the weir. Data were gathered on descending fissure spring of Tocnicky stream, located in the southwestern part of the Planicky ridge natural park in Klatovsko region. More data and stand characteristics (air temperature, soil temperature profile, soil moisture) were measured for better evaluation of the dependence, both at the spring location and in the infiltration area on the western slope of local highest peak Rovná. The formation of runoff on the slope above measured spring is likely to be subject to a combination of shallow circulation with a component of preferential flow during extreme rainfall-runoff events and deeper circulation, which is not yet well known and understood.
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